题名:铁基非晶合金涂层设计与制备及性能研究
作者:卢兰志
学位授予单位:北京工业大学
关键词:非晶涂层;;电弧喷涂;;非晶含量;;磨粒磨损;;冲蚀磨损
摘要:
循环流化床锅炉与传统燃煤锅炉相比具有煤种适应性广、污染物控制成本低、负荷调节性能好、灰渣易于综合利用等优点,被广泛应用在电力、石油、化工以及垃圾处理等领域,但是锅炉“四管”的严重冲蚀磨损影响了机组的正常运行,解决这一问题的有效途径是在受磨损部件的表面制备一层性能优异的耐磨蚀涂层。非晶合金与传统合金材料相比,具有高强度、高硬度、耐磨损、耐腐蚀等独特而优异的性能,采用喷涂技术制备非晶涂层可以将非晶合金推向工程耐磨损防护的应用领域,在一定程度上缓Magnetic lifter解循环流化床锅炉四管冲蚀磨损带来的问题。
本文在分析非晶合金系发展历程及非晶形成能力影响因素的基础上,借鉴非晶合金配方制备的经验规则,以FeCrMoCB系非晶合金系为基础系列,自主研发了两个系列具有较强非晶形成能力的铁基粉芯线材,利用高速电弧喷涂技术制备了FeCrMoCBSi系和低合金量Fe基非晶合金系两种系列的非晶合金涂层。测试和分析了两种系列非晶涂层的相结构、微观组织结构、显微硬度、热稳定性、耐高温氧化性能、耐涂盐腐蚀性能、结合强度和耐磨粒磨损性能。探讨了硅硼含量对?FeCrMoCBSi系非晶合金涂层性能的影响、镍稀土对低合金量Fe基非晶合金涂层性能的影响、硼与合金量变化对低合金量Fe基非晶合金涂层性能的影响。并对低合金量Fe基非晶合金系列涂层在30°、90°冲蚀角度不同温度下的耐冲蚀性能展开了测试和分析。主要研究成果如下:
所制备的FeCrMoCBSi系非晶合金涂层和低合金量Fe基非晶合金涂层的非晶相含量分别为65.5%、70.2%;涂层均呈典型的层状结构,致密性较好;涂层截面显微硬度均超过1300HV0.1,结合强度大于30MPa;两种非晶涂层的晶化转变温度分别为853K和855K;在650℃条件下,两种非晶涂层与铁基碳化硼涂层和铁基碳化铬涂层相比具有较好的耐氧化防护效果;FeCrMoCBSi系非晶合金涂层在?450℃条件下的耐磨粒磨损性能为GCr15轴承钢球的5.1倍,低合金量Fe基非晶合金涂层在500℃下的耐磨粒磨损http://www.999magnet.com/products/131-magnetic-lifter性能为GCr15轴承钢球的5.2倍。
硅硼含量的调整使FeCrMoCBSi系非晶合金涂层的非晶含量在47%到65.1%?之间变动,随着涂层中非晶相含量的增加涂层的显微硬度随之提高;硅硼含量变化对FeCrMoCBSi系非晶合金涂层的晶化温度没有影响;非晶相含量较高的配方表现出较好的耐磨粒磨损性能。镍稀土的添加使低合金量Fe基非晶涂层的非晶含量提高到76.5%,晶化转变温度TX有所提高,涂层表现出较高的显微硬度和较好的耐磨粒磨损性能。硼与合金量调整使低合金量Fe基非晶合金涂层的非晶含量在?71.1%到74.2%之间变动,添加16%原子分数硼元素的涂层中的非晶相含量最高,涂层的截面显微硬度随非晶含量的升高而提高;硼与合金量的变化对低合金量Fe?基非晶合金涂层的热稳定性能没有影响;非晶相含量较高的配方有较好的耐磨粒磨损性能。
同一非晶合金系列中,非晶相含量较高的涂层在各种测试条件下均表现出较好的耐冲蚀磨损性能;低合金量?Fe基非晶涂层在相同温度测试条件下,90°冲蚀角的冲蚀失重量明显大于?30°冲蚀角;低合金量?Fe?基非晶涂层在不同温度下冲蚀失重量有所差别。低合金量Fe基非晶涂层经30°冲蚀角测试后,表面出现明显切削、犁沟形痕和轻微的脆性坑状剥落,经90°冲蚀角测试后,表面出现脆性断裂、坑状剥落。
学位年度:2010
2011年12月28日星期三
山西交城狐偃山碱性偏碱性杂岩群侵入特征及构造背景探讨
题名:山西交城狐偃山碱性偏碱性杂岩群侵入特征及构造背景探讨
作者:李兆龙
学位授予单位:太原理工大学
关键词:碱性岩;;地球化学;;侵入特征;;构造背景;;交城狐偃山
摘要:
中生代华北地块发生了强烈的岩浆活动,其中尤以燕山期岩浆活动最具代表性。狐偃山碱性、偏碱性杂岩群是华北地块中部碱性-偏碱性岩浆岩的典型代表。作者把狐偃山碱性、偏碱性杂岩群当作岩石探针,通过对岩体岩石学、地球化学及构造地质学等方面的研究,探讨了岩体的侵入特点,及其形成的构造环境与动力学机制,旨在为进一步了解吕梁山中段狐偃山区中生代构造—岩浆活动提供岩浆岩方面的依据。
狐偃山碱性偏碱性杂岩群位于吕Magnetic lifter梁隆起区中段。杂岩群分布范围较广,包括7个岩带,23个岩体,根据各岩体的侵入特征以及岩体之间的相互接触、渐变过渡和穿插关系,可将岩浆活动划分为三期,早期侵入的有近等粒-等粒二长岩、斑状-似斑状二长岩、含石英二长岩和石英正长斑岩;中期侵入的为霓辉二长斑岩,晚期侵入的是正长岩和正长斑岩。
杂岩群各主要岩类主量元素特征显示其属钾质的碱性岩石系列的岩石。从最早侵入的近等粒-等粒二长岩到晚期侵入的正长斑岩,SiO2含量具由低到高再降低的变化趋势,全碱含量(Alk)、w(Al2O3)均有逐渐增加的变化趋势;CaO、TiO2、TFe2O3、MgO、MnO2与SiO2之间均为负相关关系,Na2O与SiO2呈正相关关系。稀土元素分配型式为右倾斜型,REE总量不高,轻重稀土分馏较明显,无负Eu异常,不同期次http://www.999magnet.com/products/131-magnetic-lifter岩浆作用均未发生强烈的分异。
主量元素、微量元素及同位素特征分析表明,狐偃山碱性偏碱性杂岩群各侵入单元岩石的岩浆来源于地幔物质的局部熔融,并伴随着地壳物质不同程度的加入。
狐偃山碱性偏碱性杂岩群位于由西太平洋板块向华北板块俯冲而产生的软流圈上涌区。高温状态的软流圈物质上涌致使地幔岩石圈发生局部熔融,形成壳幔混染的岩浆,沿着因“幔隆”上拱所产生的狐偃山张性断裂上侵就位,结晶成岩。碱性偏碱性杂岩体形成于大陆板内因地幔上拱作用导致其上部发生拉张的构造背景,其构造-岩浆活动为西太平洋库拉板块向欧亚板块俯冲的远程效应与深部软流圈活动共同作用的结果。
学位年度:2010
作者:李兆龙
学位授予单位:太原理工大学
关键词:碱性岩;;地球化学;;侵入特征;;构造背景;;交城狐偃山
摘要:
中生代华北地块发生了强烈的岩浆活动,其中尤以燕山期岩浆活动最具代表性。狐偃山碱性、偏碱性杂岩群是华北地块中部碱性-偏碱性岩浆岩的典型代表。作者把狐偃山碱性、偏碱性杂岩群当作岩石探针,通过对岩体岩石学、地球化学及构造地质学等方面的研究,探讨了岩体的侵入特点,及其形成的构造环境与动力学机制,旨在为进一步了解吕梁山中段狐偃山区中生代构造—岩浆活动提供岩浆岩方面的依据。
狐偃山碱性偏碱性杂岩群位于吕Magnetic lifter梁隆起区中段。杂岩群分布范围较广,包括7个岩带,23个岩体,根据各岩体的侵入特征以及岩体之间的相互接触、渐变过渡和穿插关系,可将岩浆活动划分为三期,早期侵入的有近等粒-等粒二长岩、斑状-似斑状二长岩、含石英二长岩和石英正长斑岩;中期侵入的为霓辉二长斑岩,晚期侵入的是正长岩和正长斑岩。
杂岩群各主要岩类主量元素特征显示其属钾质的碱性岩石系列的岩石。从最早侵入的近等粒-等粒二长岩到晚期侵入的正长斑岩,SiO2含量具由低到高再降低的变化趋势,全碱含量(Alk)、w(Al2O3)均有逐渐增加的变化趋势;CaO、TiO2、TFe2O3、MgO、MnO2与SiO2之间均为负相关关系,Na2O与SiO2呈正相关关系。稀土元素分配型式为右倾斜型,REE总量不高,轻重稀土分馏较明显,无负Eu异常,不同期次http://www.999magnet.com/products/131-magnetic-lifter岩浆作用均未发生强烈的分异。
主量元素、微量元素及同位素特征分析表明,狐偃山碱性偏碱性杂岩群各侵入单元岩石的岩浆来源于地幔物质的局部熔融,并伴随着地壳物质不同程度的加入。
狐偃山碱性偏碱性杂岩群位于由西太平洋板块向华北板块俯冲而产生的软流圈上涌区。高温状态的软流圈物质上涌致使地幔岩石圈发生局部熔融,形成壳幔混染的岩浆,沿着因“幔隆”上拱所产生的狐偃山张性断裂上侵就位,结晶成岩。碱性偏碱性杂岩体形成于大陆板内因地幔上拱作用导致其上部发生拉张的构造背景,其构造-岩浆活动为西太平洋库拉板块向欧亚板块俯冲的远程效应与深部软流圈活动共同作用的结果。
学位年度:2010
大功率光纤激光器的理论与实验研究
题名:大功率光纤激光器的理论与实验研究
作者:姜涛
学位授予单位:吉林大学
关键词:光纤激光器;;掺镱光纤;;双包层光纤;;大功率光纤激光器
摘要:
光纤激光器以其低阈值、高效率、高光束质量、可靠性好、结构紧凑和散热性好等诸多优点,广泛应用于光通讯、航空航天、生命科学、军事及工业领域。近年来,双包层光纤的出现,将光纤激光器的输出从毫瓦量级提高到了百瓦乃至千瓦量级,大大扩展了光纤激光器的应用范围,随着相关器件及技术的迅速发展,双包层光纤激光器的性能和功率也在不断提高。由于镱离子的发射谱主要位于1μm波段,因而掺Magnetic lifter镱双包层光纤是产生1μm波段激光输出的首选。
本论文从理论和实验两方面对连续波掺镱双包层光纤激光器进行了研究。介绍了激光器的发展历程,光纤激光器的分类和优点,以及其在世界范围的应用状况和发展前景。对光纤激光器尤其是掺杂稀土离子的双包层光纤激光器的基本原理及基本结构进行了理论分析。在实验部分,本文对光纤激光器实验中产生的问题进行了分析与研究,着重介绍了使用双色镜实现泵浦耦合的光纤激光器的实验过程,以及http://www.999magnet.com/products/131-magnetic-lifter在全光纤化结大高功率掺镱双包层光纤激光器的实验中获得了功率为10.8瓦的连续输出光纤激光器;最后对实验中光纤端面处理和光纤间的连接的关键工艺技术进行了介绍。
学位年度:2010
作者:姜涛
学位授予单位:吉林大学
关键词:光纤激光器;;掺镱光纤;;双包层光纤;;大功率光纤激光器
摘要:
光纤激光器以其低阈值、高效率、高光束质量、可靠性好、结构紧凑和散热性好等诸多优点,广泛应用于光通讯、航空航天、生命科学、军事及工业领域。近年来,双包层光纤的出现,将光纤激光器的输出从毫瓦量级提高到了百瓦乃至千瓦量级,大大扩展了光纤激光器的应用范围,随着相关器件及技术的迅速发展,双包层光纤激光器的性能和功率也在不断提高。由于镱离子的发射谱主要位于1μm波段,因而掺Magnetic lifter镱双包层光纤是产生1μm波段激光输出的首选。
本论文从理论和实验两方面对连续波掺镱双包层光纤激光器进行了研究。介绍了激光器的发展历程,光纤激光器的分类和优点,以及其在世界范围的应用状况和发展前景。对光纤激光器尤其是掺杂稀土离子的双包层光纤激光器的基本原理及基本结构进行了理论分析。在实验部分,本文对光纤激光器实验中产生的问题进行了分析与研究,着重介绍了使用双色镜实现泵浦耦合的光纤激光器的实验过程,以及http://www.999magnet.com/products/131-magnetic-lifter在全光纤化结大高功率掺镱双包层光纤激光器的实验中获得了功率为10.8瓦的连续输出光纤激光器;最后对实验中光纤端面处理和光纤间的连接的关键工艺技术进行了介绍。
学位年度:2010
水溶性可见光激发铕荧光标记物的制备与应用
题名:水溶性可见光激发铕荧光标记物的制备与应用
作者:蒋丽娜
学位授予单位:大连理工大学
关键词:铕配合物;;水溶性;;可见光激发;;环境病原微生物;;时间分辨荧光生物成像
摘要:
基于稀土荧光生物标记探针长寿命荧光特性而发展起来的高灵敏的时间分辨荧光生化分析技术已经在临床检测与生物技术领域得到了广泛的应用。但由于大多数稀土荧光生物标记物需使用光毒性较大的紫外光作为激发光源,对活体生物样品有一定的光损伤,而目前已知的几种长波长激发铕配合物又存在水溶性差、极性配Magnetic lifter位溶剂中不稳定、发光量子产率低或缺乏活性标记基团等问题而无法用于生物标记,从而大大限制了时间分辨荧光生化分析技术在活体样品检测分析中的应用。
本研究通过将两种配体4,4’-二(1”,1”,1”,2”,2”,3”,3”-七氟-4”,6”-己二酮-6"-基)氯磺酰基-邻二苯基苯(BHHCT)及2-(N,N-二乙基苯胺-4-基)-4,6-二(3,5-二甲基吡唑-1-基)-1,3,5-三嗪(DPBT)共同与铕离子配位,制备出一种具有可见光激发性能的三元铕配合物BHHCT-Eu3+-DPBT,再通过将该配合物与牛血清白蛋白结合的方法,制备出一种水溶性好且可被可见光激发的铕配合物结合蛋白。该结合蛋白的荧光激发波长可延长至可见光区(>380 nm),并具有较高的荧光量子产率(27％)和较长的荧光寿命(0.46 ms),该结合蛋白标记链霉亲和素后被成功地用于水样品中病原微生物蓝氏贾第鞭毛虫(Giardia lamblia),鼠隐孢子虫(Cryptosporidium muris)以及小隐孢子虫(Cryptosporidium parvium)的免疫荧光染色及时间分辨荧光显微成像测定。所得结果表明本研究制备的水溶性可见光激发铕配合物结合蛋白可作为一种新型荧光标记物用于时间分辨荧光生物成像分析领域。http://www.999magnet.com/products/131-magnetic-lifter
学位年度:2010
作者:蒋丽娜
学位授予单位:大连理工大学
关键词:铕配合物;;水溶性;;可见光激发;;环境病原微生物;;时间分辨荧光生物成像
摘要:
基于稀土荧光生物标记探针长寿命荧光特性而发展起来的高灵敏的时间分辨荧光生化分析技术已经在临床检测与生物技术领域得到了广泛的应用。但由于大多数稀土荧光生物标记物需使用光毒性较大的紫外光作为激发光源,对活体生物样品有一定的光损伤,而目前已知的几种长波长激发铕配合物又存在水溶性差、极性配Magnetic lifter位溶剂中不稳定、发光量子产率低或缺乏活性标记基团等问题而无法用于生物标记,从而大大限制了时间分辨荧光生化分析技术在活体样品检测分析中的应用。
本研究通过将两种配体4,4’-二(1”,1”,1”,2”,2”,3”,3”-七氟-4”,6”-己二酮-6"-基)氯磺酰基-邻二苯基苯(BHHCT)及2-(N,N-二乙基苯胺-4-基)-4,6-二(3,5-二甲基吡唑-1-基)-1,3,5-三嗪(DPBT)共同与铕离子配位,制备出一种具有可见光激发性能的三元铕配合物BHHCT-Eu3+-DPBT,再通过将该配合物与牛血清白蛋白结合的方法,制备出一种水溶性好且可被可见光激发的铕配合物结合蛋白。该结合蛋白的荧光激发波长可延长至可见光区(>380 nm),并具有较高的荧光量子产率(27％)和较长的荧光寿命(0.46 ms),该结合蛋白标记链霉亲和素后被成功地用于水样品中病原微生物蓝氏贾第鞭毛虫(Giardia lamblia),鼠隐孢子虫(Cryptosporidium muris)以及小隐孢子虫(Cryptosporidium parvium)的免疫荧光染色及时间分辨荧光显微成像测定。所得结果表明本研究制备的水溶性可见光激发铕配合物结合蛋白可作为一种新型荧光标记物用于时间分辨荧光生物成像分析领域。http://www.999magnet.com/products/131-magnetic-lifter
学位年度:2010
浊点萃取法分离铜与相关金属离子的研究
题名:浊点萃取法分离铜与相关金属离子的研究
作者:魏燕存
学位授予单位:吉林大学
关键词:浊点萃取;;铜离子;;镧系离子;;TritonX-100;;杯四磺酸钠
摘要:
本文应用浊点萃取法,以杯四磺酸钠作为络合剂,以非离子表面活性剂TritonX-100作为萃取剂,研究了铜离子与稀土离子等金属离子的萃取分离情况。基于铜离子和稀土离子与络合剂形成复杂螯合物的能力有较大差异,从而选择性Magnetic lifter地溶解到表面活性剂胶束相中,实验中研究了各种参数对萃取率的影响,如酸度、表面活性剂浓度、络合剂浓度、平衡时间、离心时间、离子强度等。结果表明,杯四磺酸钠对铜离子的络合能力远远高于镧系离子和铁系离子。在一定条件下,该方法可以http://www.999magnet.com/products/131-magnetic-lifter应用于铜离子和镧系离子(镧、钆、镱)及钴离子的分离。
学位年度:2010
作者:魏燕存
学位授予单位:吉林大学
关键词:浊点萃取;;铜离子;;镧系离子;;TritonX-100;;杯四磺酸钠
摘要:
本文应用浊点萃取法,以杯四磺酸钠作为络合剂,以非离子表面活性剂TritonX-100作为萃取剂,研究了铜离子与稀土离子等金属离子的萃取分离情况。基于铜离子和稀土离子与络合剂形成复杂螯合物的能力有较大差异,从而选择性Magnetic lifter地溶解到表面活性剂胶束相中,实验中研究了各种参数对萃取率的影响,如酸度、表面活性剂浓度、络合剂浓度、平衡时间、离心时间、离子强度等。结果表明,杯四磺酸钠对铜离子的络合能力远远高于镧系离子和铁系离子。在一定条件下,该方法可以http://www.999magnet.com/products/131-magnetic-lifter应用于铜离子和镧系离子(镧、钆、镱)及钴离子的分离。
学位年度:2010
2011年12月27日星期二
B位掺杂锰基复合氧化物的水热合成及表征
题名:B位掺杂锰基复合氧化物的水热合成及表征
作者:李蔚娟
学位授予单位:吉林大学
关键词:位掺杂;;锰基复合氧化物;;水热合成
摘要:
本论文主要研究在水热体系下,B位掺杂锰基复合氧化物的水热合成与表征。分别对B位Fe离子和Ni离子的掺杂条件及方法做了系统摸索,并对离子掺杂所导致的形貌与性质变化做了系统的研究。在第一章绪论中,介绍了钙钛Magnetic lifter 矿型复合氧化物的结构和磁学性质,并介绍了A、B位掺杂钙钛矿型锰基氧化物的研究背景及进展;在第二章中,利用水热合成方法合成B位Fe掺杂的锰基氧化物体系La1-x-y Srx Ky Fe 0.5 Mn0.5 O3(x=0.1-0.4),选择了最优的合成的条件和方法,并对产物结构、形貌、性质进行了表征。结果表明水热合成方法具有易于生成介稳相、稳定特殊价态和完美晶体的特点;在第http://www.999magnet.com/products/131-magnetic-lifter三章中,利用水热方法首次合成了B位Ni掺杂的锰基氧化物体系RMn1-xNixO3(R= Ho、Y、Tb、Gd),并对产物合成与性质进行了详细讨论。
学位年度:2010
作者:李蔚娟
学位授予单位:吉林大学
关键词:位掺杂;;锰基复合氧化物;;水热合成
摘要:
本论文主要研究在水热体系下,B位掺杂锰基复合氧化物的水热合成与表征。分别对B位Fe离子和Ni离子的掺杂条件及方法做了系统摸索,并对离子掺杂所导致的形貌与性质变化做了系统的研究。在第一章绪论中,介绍了钙钛Magnetic lifter 矿型复合氧化物的结构和磁学性质,并介绍了A、B位掺杂钙钛矿型锰基氧化物的研究背景及进展;在第二章中,利用水热合成方法合成B位Fe掺杂的锰基氧化物体系La1-x-y Srx Ky Fe 0.5 Mn0.5 O3(x=0.1-0.4),选择了最优的合成的条件和方法,并对产物结构、形貌、性质进行了表征。结果表明水热合成方法具有易于生成介稳相、稳定特殊价态和完美晶体的特点;在第http://www.999magnet.com/products/131-magnetic-lifter三章中,利用水热方法首次合成了B位Ni掺杂的锰基氧化物体系RMn1-xNixO3(R= Ho、Y、Tb、Gd),并对产物合成与性质进行了详细讨论。
学位年度:2010
基于苯多酸配体的金属有机配合物的合成及其性能研究
题名:基于苯多酸配体的金属有机配合物的合成及其性能研究
作者:何海燕
学位授予单位:山东大学
关键词:超分子化学;;配位化学;;自组装;;水热/溶剂热反应;;空间位阻效应;;气体吸附
摘要:
近年来,利用过渡金属或稀土金属离子与具有多官能团的有机配体,通过配位键驱动自组装得到配位化合物一直是超分子化学研究中的活跃领域。由于配位化合物在光电、磁性、氧化还原催化、离子交换、气体吸附、分离纯化、分子识别等方面具有广泛的应用,配位化学家和晶体工程学家致力于配位化合物的设计和合Magnetic lifter成,筛选出一些良好的特殊功能材料,并且发现了许多新颖的拓扑结构类型,同时掌握了一些自组装过程中影响化合物最终结构的因素,如溶剂、配体构型、温度等,以期达到控制合成的目的。
在过去的几十年中,共平面的羧酸类配体由于强的配位能力以及配位的多样性在晶体构筑过程中被广泛应用。研究表明,配体的构型和金属离子的配位模式对晶体结构有重要影响,对配体结构的简单修饰即可改变自组装产物的结构。本论文选用一系列具有空间位阻效应的非共面羧酸为主配体,掺杂咪唑类、吡啶类、或螯合的邻菲啰啉配体作为辅助配体,通过配位键或超分子弱作用与金属离子组装合成新颖的配位化合物,进一步探讨了各种因素对化合物最终结构的影响,并测定了它们的气体吸附、荧光等性能。主要做了以下工作：综述了羧酸的配位化学,以羧酸配体为主与过渡金属或稀土金属离子在水／溶液热条件下组装合成了14个新颖的配位化合物：Cu4(OH)2(SO4)(HBTC)2(bpy)·bpy(1)、Cu1.5(H2O)(TMBTC)(bpy)·0.5H2O (2)、Cd2(H2O)5(TMBTC)(bpy)2·NO3·3H2O (3)、Ni(BITMB)(TMIPA)·2H2O (4)、Zn(BITMB)(IPA)·H2O (5)、Zn2(BITMB)2(HIPA)2(IPA)·H2O(6)、Zn(TBDC1)0.5(TBDC2)0.5 (7)、Er(BDC)1.5(dmf)(H2O) (8)、Tm(BDC)1.5(dmf)(H2O) (9)、Er2(BDC)3(phen)2·3H2O (10) Tm(TBDC)1.5(dmf)(H2O)·2H2O (11)、Er2(TBDC)3(phen)2·4dm·2H2O (12)、Tm(BDC)1.5(H2O)·0.5dmf-C2H5OH·2H2O (13) Tm4(BDC)6(H2O)2(dmf)2·4dmf·2H2O (14)。
单晶X-射线衍射分析表明：化合物1为三维三重穿插结构；化合物2为三维二重穿插结构、3为三维结构、4为一维链状结构、5为二维层状穿插结构、6为三维孔道结构、7是基于二核SBU构筑的三维(3,5)-连接拓扑网络结构、8和9均属于三维二重穿插结构、10-14属于三维非穿插网状结构。其中,化合物1和2是利用共面的和非共面的羧酸配体而得到不同的结构；化合物4、5、6是利用一种具有顺式-或反式-结构的咪唑类柔性配体,通过溶剂或金属控制得到配体构型和维度均不相同的化合物；化合http://www.999magnet.com/products/131-magnetic-lifter物7通过粉末衍射证实,可通过二维双层状结构MOF-47直接转换获得；化合物8、9为异质同晶结构；化合物10-12是利用空间位阻效应得到的非穿插的镧系金属有机框架物；化合物13-14则是利用一维棒状单元组装得到的非穿插微孔金属有机框架物。同时,对化合物3、5-7做了固态荧光谱学的测试,化合物12-14做了气体吸附性质的测试,化合物1-8、12、13做了热重测试分析。
以上金属-有机配合物不仅为超分子及金属-有机复合材料化学增添了新的内容,而且为寻找、筛选金属-有机复合材料提供了新的途径。
学位年度:2010
作者:何海燕
学位授予单位:山东大学
关键词:超分子化学;;配位化学;;自组装;;水热/溶剂热反应;;空间位阻效应;;气体吸附
摘要:
近年来,利用过渡金属或稀土金属离子与具有多官能团的有机配体,通过配位键驱动自组装得到配位化合物一直是超分子化学研究中的活跃领域。由于配位化合物在光电、磁性、氧化还原催化、离子交换、气体吸附、分离纯化、分子识别等方面具有广泛的应用,配位化学家和晶体工程学家致力于配位化合物的设计和合Magnetic lifter成,筛选出一些良好的特殊功能材料,并且发现了许多新颖的拓扑结构类型,同时掌握了一些自组装过程中影响化合物最终结构的因素,如溶剂、配体构型、温度等,以期达到控制合成的目的。
在过去的几十年中,共平面的羧酸类配体由于强的配位能力以及配位的多样性在晶体构筑过程中被广泛应用。研究表明,配体的构型和金属离子的配位模式对晶体结构有重要影响,对配体结构的简单修饰即可改变自组装产物的结构。本论文选用一系列具有空间位阻效应的非共面羧酸为主配体,掺杂咪唑类、吡啶类、或螯合的邻菲啰啉配体作为辅助配体,通过配位键或超分子弱作用与金属离子组装合成新颖的配位化合物,进一步探讨了各种因素对化合物最终结构的影响,并测定了它们的气体吸附、荧光等性能。主要做了以下工作：综述了羧酸的配位化学,以羧酸配体为主与过渡金属或稀土金属离子在水／溶液热条件下组装合成了14个新颖的配位化合物：Cu4(OH)2(SO4)(HBTC)2(bpy)·bpy(1)、Cu1.5(H2O)(TMBTC)(bpy)·0.5H2O (2)、Cd2(H2O)5(TMBTC)(bpy)2·NO3·3H2O (3)、Ni(BITMB)(TMIPA)·2H2O (4)、Zn(BITMB)(IPA)·H2O (5)、Zn2(BITMB)2(HIPA)2(IPA)·H2O(6)、Zn(TBDC1)0.5(TBDC2)0.5 (7)、Er(BDC)1.5(dmf)(H2O) (8)、Tm(BDC)1.5(dmf)(H2O) (9)、Er2(BDC)3(phen)2·3H2O (10) Tm(TBDC)1.5(dmf)(H2O)·2H2O (11)、Er2(TBDC)3(phen)2·4dm·2H2O (12)、Tm(BDC)1.5(H2O)·0.5dmf-C2H5OH·2H2O (13) Tm4(BDC)6(H2O)2(dmf)2·4dmf·2H2O (14)。
单晶X-射线衍射分析表明：化合物1为三维三重穿插结构；化合物2为三维二重穿插结构、3为三维结构、4为一维链状结构、5为二维层状穿插结构、6为三维孔道结构、7是基于二核SBU构筑的三维(3,5)-连接拓扑网络结构、8和9均属于三维二重穿插结构、10-14属于三维非穿插网状结构。其中,化合物1和2是利用共面的和非共面的羧酸配体而得到不同的结构；化合物4、5、6是利用一种具有顺式-或反式-结构的咪唑类柔性配体,通过溶剂或金属控制得到配体构型和维度均不相同的化合物；化合http://www.999magnet.com/products/131-magnetic-lifter物7通过粉末衍射证实,可通过二维双层状结构MOF-47直接转换获得；化合物8、9为异质同晶结构；化合物10-12是利用空间位阻效应得到的非穿插的镧系金属有机框架物；化合物13-14则是利用一维棒状单元组装得到的非穿插微孔金属有机框架物。同时,对化合物3、5-7做了固态荧光谱学的测试,化合物12-14做了气体吸附性质的测试,化合物1-8、12、13做了热重测试分析。
以上金属-有机配合物不仅为超分子及金属-有机复合材料化学增添了新的内容,而且为寻找、筛选金属-有机复合材料提供了新的途径。
学位年度:2010
2011年12月26日星期一
Shanxi Lingqiu County branch of the family silver to lead and zinc geochemical characteristics and genesis of
Title: Shanxi Lingqiu County branch of the family silver to lead and zinc geochemical characteristics and genesis ofAuthor: Joseph Tan XianDegree-granting units: Central South UniversityKeywords: branch home to lead-zinc silver;; ore types;; mineralization age;; into mineral sources;; genesisSummary:
Based on the national crisis prospecting mining resources, project management office to succeed in 2008 approved the project of "Shanxi Lingqiu County branch of the family to the law and lead-zinc silver mineralization prediction" special research projects, the paper support at home to carry out a lead-zinc silver deposit geology macroscopic, microscopic characteristics, geochemical (REE, trace elements and stable isotopes) characteristics of research on Magnetic lifter family support to hydrothermal fracture filling ore type and hidden breccia-type ore body has been studied and compared, minerals of the mine into the sources and causes, in order to further understanding of epithermal polymetallic mineralization law and the establishment of metallogenic model provides a useful example.
And understanding of the major achievements are as follows:
(1) support home ground, Zn, Ag mine conducted a field investigation, the middle and through different geological phenomena revealed by drilling, carried out the macro feature more deposits, divided into hydrothermal fracture filling type, two hidden breccia type major ore types, comparison of two types of ore body shape and spatial distribution.
(2) the microscopic characteristics of the two types of ore bodies, geochemical characteristics were compared by analysis of microscopic petrography and X-ray diffraction analysis, we found two types of ore in the ore mineral composition and structure of construction so there are obvious differences, further confirmed the correct classification between the two.
(3) found that there are different stages of mine mineralization. Using ICP-MS, electron probe and scanning electron microscopy spectrometer for different stages of in situ sulfide content analysis of major elements, both confirmed from the microscopic point of view the difference between the two, is also mine the first time the multi-stage understanding of http://www.999magnet.com/products/131-magnetic-lifter mineralization for the expansion of mining resources to provide a valid theoretical basis.
(4) tentative breccia cements using implicit in the single-zircon U-Pb dating was carried out to determine its mineralization age (129-144Ma).
(5) of the ore rock geochemical studies carried out, quartz porphyry of major elements, REE and trace element analysis showed that the main characteristics of S-type granites are similar; Pb isotope, δ18O, δD, and Lu-Hf isotope The results show that the main area magmatic source for the lower crust and mantle materials mixed with, for the mineralization model was provided.Degree Year: 2010
Based on the national crisis prospecting mining resources, project management office to succeed in 2008 approved the project of "Shanxi Lingqiu County branch of the family to the law and lead-zinc silver mineralization prediction" special research projects, the paper support at home to carry out a lead-zinc silver deposit geology macroscopic, microscopic characteristics, geochemical (REE, trace elements and stable isotopes) characteristics of research on Magnetic lifter family support to hydrothermal fracture filling ore type and hidden breccia-type ore body has been studied and compared, minerals of the mine into the sources and causes, in order to further understanding of epithermal polymetallic mineralization law and the establishment of metallogenic model provides a useful example.
And understanding of the major achievements are as follows:
(1) support home ground, Zn, Ag mine conducted a field investigation, the middle and through different geological phenomena revealed by drilling, carried out the macro feature more deposits, divided into hydrothermal fracture filling type, two hidden breccia type major ore types, comparison of two types of ore body shape and spatial distribution.
(2) the microscopic characteristics of the two types of ore bodies, geochemical characteristics were compared by analysis of microscopic petrography and X-ray diffraction analysis, we found two types of ore in the ore mineral composition and structure of construction so there are obvious differences, further confirmed the correct classification between the two.
(3) found that there are different stages of mine mineralization. Using ICP-MS, electron probe and scanning electron microscopy spectrometer for different stages of in situ sulfide content analysis of major elements, both confirmed from the microscopic point of view the difference between the two, is also mine the first time the multi-stage understanding of http://www.999magnet.com/products/131-magnetic-lifter mineralization for the expansion of mining resources to provide a valid theoretical basis.
(4) tentative breccia cements using implicit in the single-zircon U-Pb dating was carried out to determine its mineralization age (129-144Ma).
(5) of the ore rock geochemical studies carried out, quartz porphyry of major elements, REE and trace element analysis showed that the main characteristics of S-type granites are similar; Pb isotope, δ18O, δD, and Lu-Hf isotope The results show that the main area magmatic source for the lower crust and mantle materials mixed with, for the mineralization model was provided.Degree Year: 2010
Large cross-section stability and properties of ductile iron research
Title: Large cross-section stability and properties of ductile iron research Author: Roger Degree-granting units: South China University of Technology Keywords: cross-section ductile iron;; Chunky graphite;; trace elements;; bred with the flow Summary:
As a large cross-section ductile iron solidification cooling is slow, making the casting center often appear Chunky graphite graphite distortion phenomenon, greatly reducing the heart of the casting department of mechanical properties. In the past 40 years,Magnetic lifter researchers at home and abroad for large cross-section ductile iron casting in graphite distortion problem a lot of research, but also made great progress. However, the current for the formation mechanism of Chunky graphite is still not very clear, for the study of the problem has also been continued.
This article first production site in the industrial casting of Φ590 × 800mm ductile iron casting large cross-section analysis of the different cross-section at the solidification process, the morphology and mechanical properties of the casting of the broken graphite block causes. Then, the paper developed a modular multi-resistance furnace 1500 ℃, and the use of the device control the simulation of casting solidification, to achieve a large section of the physical simulation of solidification process. On this basis, we further study the trace elements Sb, Bi, and with the birth dose of the simulation flow and properties of castings, studied with the flow by adding nano-SiC particles on the ductile properties of the organization. The main conclusions are as follows:
(1) Φ590 × 800mm large section nodular cast slow cooling solidification, solidification in the casting center of the longest, reaching 372 minutes. Shortest edge in the casting solidification time, 232 minutes; casting wall thickness at the different microstructures and mechanical properties of special circumstances. 170mm away from the center of the casting office, http://www.999magnet.com/products/131-magnetic-lifter serious deterioration of graphite morphology, Chunky graphite up, the worst mechanical properties, casting tensile strength, hardness, elongation were 362MPa, 195HBW, 1.67%. 255mm away from the center of the casting office, the best form of graphite, the best mechanical properties, tensile strength and hardness of castings were 494MPa and 225HBW. 85mm from the center of the circle casting range, there is a certain amount of spherical graphite and graphite Chunky, good mechanical properties of castings.
(2) Φ590 × 800mm large section castings, magnesium and rare earth elements along the radial direction there was a certain macro-segregation. 170mm away from the center of the casting office, magnesium and rare earth elements enrichment, its contents were cast away from the center than 255mm high at 26% and 20%.
(3) 1500 ℃ modular multi-resistance furnace structure is simple, easy to use. Use of the resistance furnace can better control the simulation of casting cooling, casting simulation to achieve a large section of the Ministry of casting solidification simulation of the heart. Simulation with a large cross-section castings casting solidification cooling curves of the actual error is less than 1.7%.
(4) trace elements Sb, Bi can improve the simulation of casting distortion in the form of graphite. When the added amount was 0.01wt.% Time, Sb elements to improve the effect is stronger than Bi elements. When the added amount of Sb alloy 0.03wt.%, The simulation of casting away Chunky graphite morphology, nodular form is best. At this point, casting tensile strength, yield strength and elongation, respectively, the highest value 707MPa, 610MPa and 2.96%, compared with simulations without trace of the mechanical properties of cast high-74.4%, respectively, 81.9% and 22.9%.
(5) flow through the birth of the way with the ball of molten iron after the birth process to continue adding 0.1wt.% And 0.2wt.% Of the inoculant to promote the increase in the number of graphite castings, but also contributed to the distortion of graphite and ferrite matrix increase, reducing the casting of tensile strength and hardness.
(6) through breeding with the flow in the normal way to add casting 0.2wt.% Nano-SiC particles can be better to increase the number of spheroidal graphite in cast, improve the graphite morphology, improve the mechanical properties of castings. With the flow in the simulation in castings by adding 0.2wt.% Nano-SiC particles for graphite precipitation, reducing the tensile strength and hardness of the casting. Degree Year: 2010
As a large cross-section ductile iron solidification cooling is slow, making the casting center often appear Chunky graphite graphite distortion phenomenon, greatly reducing the heart of the casting department of mechanical properties. In the past 40 years,Magnetic lifter researchers at home and abroad for large cross-section ductile iron casting in graphite distortion problem a lot of research, but also made great progress. However, the current for the formation mechanism of Chunky graphite is still not very clear, for the study of the problem has also been continued.
This article first production site in the industrial casting of Φ590 × 800mm ductile iron casting large cross-section analysis of the different cross-section at the solidification process, the morphology and mechanical properties of the casting of the broken graphite block causes. Then, the paper developed a modular multi-resistance furnace 1500 ℃, and the use of the device control the simulation of casting solidification, to achieve a large section of the physical simulation of solidification process. On this basis, we further study the trace elements Sb, Bi, and with the birth dose of the simulation flow and properties of castings, studied with the flow by adding nano-SiC particles on the ductile properties of the organization. The main conclusions are as follows:
(1) Φ590 × 800mm large section nodular cast slow cooling solidification, solidification in the casting center of the longest, reaching 372 minutes. Shortest edge in the casting solidification time, 232 minutes; casting wall thickness at the different microstructures and mechanical properties of special circumstances. 170mm away from the center of the casting office, http://www.999magnet.com/products/131-magnetic-lifter serious deterioration of graphite morphology, Chunky graphite up, the worst mechanical properties, casting tensile strength, hardness, elongation were 362MPa, 195HBW, 1.67%. 255mm away from the center of the casting office, the best form of graphite, the best mechanical properties, tensile strength and hardness of castings were 494MPa and 225HBW. 85mm from the center of the circle casting range, there is a certain amount of spherical graphite and graphite Chunky, good mechanical properties of castings.
(2) Φ590 × 800mm large section castings, magnesium and rare earth elements along the radial direction there was a certain macro-segregation. 170mm away from the center of the casting office, magnesium and rare earth elements enrichment, its contents were cast away from the center than 255mm high at 26% and 20%.
(3) 1500 ℃ modular multi-resistance furnace structure is simple, easy to use. Use of the resistance furnace can better control the simulation of casting cooling, casting simulation to achieve a large section of the Ministry of casting solidification simulation of the heart. Simulation with a large cross-section castings casting solidification cooling curves of the actual error is less than 1.7%.
(4) trace elements Sb, Bi can improve the simulation of casting distortion in the form of graphite. When the added amount was 0.01wt.% Time, Sb elements to improve the effect is stronger than Bi elements. When the added amount of Sb alloy 0.03wt.%, The simulation of casting away Chunky graphite morphology, nodular form is best. At this point, casting tensile strength, yield strength and elongation, respectively, the highest value 707MPa, 610MPa and 2.96%, compared with simulations without trace of the mechanical properties of cast high-74.4%, respectively, 81.9% and 22.9%.
(5) flow through the birth of the way with the ball of molten iron after the birth process to continue adding 0.1wt.% And 0.2wt.% Of the inoculant to promote the increase in the number of graphite castings, but also contributed to the distortion of graphite and ferrite matrix increase, reducing the casting of tensile strength and hardness.
(6) through breeding with the flow in the normal way to add casting 0.2wt.% Nano-SiC particles can be better to increase the number of spheroidal graphite in cast, improve the graphite morphology, improve the mechanical properties of castings. With the flow in the simulation in castings by adding 0.2wt.% Nano-SiC particles for graphite precipitation, reducing the tensile strength and hardness of the casting. Degree Year: 2010
Semi-continuous-cast magnesium alloy ingots of
Title: Semi-continuous-cast magnesium alloy ingots of Author: Zhao Kaiyang Degree-granting units: Chongqing University Keywords: semi-continuous casting;; secondary cooling water;; casting speed;; secondary dendrite arm spacing;; macrosegregation Summary:
Magnesium alloy light weight, strength and specific stiffness, damping, good, able to withstand large impact loads, etc., in many areas have been more widely used. In order to reduce deformation of magnesium alloy ingot defects, reduce the ingot macrosegregation increased the levels of deformation of magnesium alloy semi-continuous-cast ingot quality, has the Magnetic lifter effect of the hot top casting, continuous casting and electromagnetic casting and other new technologies, but The new process equipment is more complex, costs have increased, the popularity of far less than traditional semi-continuous casting.
This as the National Key Basic Research Program "973", "semi-continuous ingot magnesium alloy characterization and quality evaluation of the organization," the part, the proposed optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction ( XRD), differential thermal analyzer (DSC) and other means of detection, by considering several typical wrought magnesium alloy ingot in the traditional semi-continuous casting process, the different secondary cooling water, casting speed and size of the solidified ingot segregation of alloying elements and the influence of the macro, as well as different levels of rare earth Ce on ZK20 magnesium alloy ingots semi-continuous organizational impact assessment of a variety of conditions, the merits of the slab organization for large-scale semi-continuous magnesium alloy casting provide guidance on the production process.
The results show that:
① In the traditional semi-continuous casting conditions, AZ31 magnesium alloy ingots organization to some extent, with the secondary cooling water and casting speed increases gradually refined, when the secondary cooling water 58L/min, casting speed 16cm/min, have access to a small size, homogeneous of Φ90AZ31 magnesium alloy semi-continuous ingot.
② by comparing the diameter of the AZ series of magnesium alloy semi-continuous ingot cross-section of tissue obtained, Φ100 magnesium alloy ingot ingot showing a small central organization, the edge of thick tissue anomalies, other organizations are the diameter of the ingot typical ingot organizational characteristics, the center's organizational thick, while the secondary cooling water from near the edge of a small organization; diameter Φ165, Φ170 magnesium alloy ingot obvious thick edge region columnar grain zone; with the diameter of the ingot http://www.999magnet.com/products/131-magnetic-lifter increase in ingot more uniform radial organization, but when the diameter of Φ500, AZ91 ingot size larger ingot central region received almost no secondary cooling water chilling effect, the grain was coarse, Radial organization was significantly different, the overall uniformity of variation.
③ AZ by analyzing the diameter of the Department of magnesium alloy semi-continuous vertical section of the organization come ingot, magnesium alloy ingot vertical section of the organization compared to the same cross-section of organizations, not much difference, but close to the edge of the ingot The longitudinal section at the secondary cooling water due to the impact of one-way thermal effects, there are a certain amount of long dendrites.
④ AZ series magnesium alloys in the semi-continuous solute segregation of Al and Zn as the ingot diameter decreases, a comprehensive analysis of various diameter ingot, Φ300AZ31 magnesium alloy ingot cross-section of organizations and solute elements in the radial The most uniform distribution of solute elements in the smallest degree of macro-segregation.
⑤ rare earth elements Ce has refined the role of magnesium alloy. To Mg-1.5Zn-0.2Zr semi-continuous mass percentage of magnesium alloy by adding 0.3% Ce can get the most precipitate dispersion, uniform refinement of the best organizations; adding Ce after the Mg-1.5Zn-0.2Zr magnesium alloy semi-continuous ingot from the center to the edge of the intragranular precipitates gradually reduced or even disappear. Degree Year: 2010
Magnesium alloy light weight, strength and specific stiffness, damping, good, able to withstand large impact loads, etc., in many areas have been more widely used. In order to reduce deformation of magnesium alloy ingot defects, reduce the ingot macrosegregation increased the levels of deformation of magnesium alloy semi-continuous-cast ingot quality, has the Magnetic lifter effect of the hot top casting, continuous casting and electromagnetic casting and other new technologies, but The new process equipment is more complex, costs have increased, the popularity of far less than traditional semi-continuous casting.
This as the National Key Basic Research Program "973", "semi-continuous ingot magnesium alloy characterization and quality evaluation of the organization," the part, the proposed optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction ( XRD), differential thermal analyzer (DSC) and other means of detection, by considering several typical wrought magnesium alloy ingot in the traditional semi-continuous casting process, the different secondary cooling water, casting speed and size of the solidified ingot segregation of alloying elements and the influence of the macro, as well as different levels of rare earth Ce on ZK20 magnesium alloy ingots semi-continuous organizational impact assessment of a variety of conditions, the merits of the slab organization for large-scale semi-continuous magnesium alloy casting provide guidance on the production process.
The results show that:
① In the traditional semi-continuous casting conditions, AZ31 magnesium alloy ingots organization to some extent, with the secondary cooling water and casting speed increases gradually refined, when the secondary cooling water 58L/min, casting speed 16cm/min, have access to a small size, homogeneous of Φ90AZ31 magnesium alloy semi-continuous ingot.
② by comparing the diameter of the AZ series of magnesium alloy semi-continuous ingot cross-section of tissue obtained, Φ100 magnesium alloy ingot ingot showing a small central organization, the edge of thick tissue anomalies, other organizations are the diameter of the ingot typical ingot organizational characteristics, the center's organizational thick, while the secondary cooling water from near the edge of a small organization; diameter Φ165, Φ170 magnesium alloy ingot obvious thick edge region columnar grain zone; with the diameter of the ingot http://www.999magnet.com/products/131-magnetic-lifter increase in ingot more uniform radial organization, but when the diameter of Φ500, AZ91 ingot size larger ingot central region received almost no secondary cooling water chilling effect, the grain was coarse, Radial organization was significantly different, the overall uniformity of variation.
③ AZ by analyzing the diameter of the Department of magnesium alloy semi-continuous vertical section of the organization come ingot, magnesium alloy ingot vertical section of the organization compared to the same cross-section of organizations, not much difference, but close to the edge of the ingot The longitudinal section at the secondary cooling water due to the impact of one-way thermal effects, there are a certain amount of long dendrites.
④ AZ series magnesium alloys in the semi-continuous solute segregation of Al and Zn as the ingot diameter decreases, a comprehensive analysis of various diameter ingot, Φ300AZ31 magnesium alloy ingot cross-section of organizations and solute elements in the radial The most uniform distribution of solute elements in the smallest degree of macro-segregation.
⑤ rare earth elements Ce has refined the role of magnesium alloy. To Mg-1.5Zn-0.2Zr semi-continuous mass percentage of magnesium alloy by adding 0.3% Ce can get the most precipitate dispersion, uniform refinement of the best organizations; adding Ce after the Mg-1.5Zn-0.2Zr magnesium alloy semi-continuous ingot from the center to the edge of the intragranular precipitates gradually reduced or even disappear. Degree Year: 2010
2011年12月25日星期日
3d-4f magnetic low-dimensional molecular synthesis, structure and characterization
Title: 3d-4f magnetic low-dimensional molecular synthesis, structure and characterization
Author: Ke Red Hill
Degree-granting unit: Changchun University of Technology
Keywords: Schiff base;; polydentate ligand;; earth;; magnetic;; clusters
Summary:
In this paper a multi-tooth Schiff base http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets ligands with transition metal and / or the reaction of eight rare-earth compounds were analyzed for their crystal structure and magnetic properties of the test.
Crystal structure analysis shows that compound 7 (C_ (88) H_ (126) N_4Pr_ (10) O_ (66)) and 8 (C_ (90) H_ (130) N_4Nd_ (10) O_ (66)) is the same structure, but also in the compound 2 (C_ (54) H_ (82) N_4O_ (34) Cl_2Mn_4) and 5 (C_ (66) H_ (126) N_4O_ (50) Cl_2Mn_4Nd_2), 6 (C_ (96) H_ (148) N_6O_ (70 ) Dy_ (10)) ,7-8 in two different ligand coordination modes and metal coordination, more interesting is that in compound 6 groups, Neodymium Magnets we found five different acid base coordination mode of the co-existence, However, compounds 7 and 8 are only three different acid base groups co-exist with the bit pattern.
Magnetic tests show that all compounds intramolecular antiferromagnetic interaction exists, but also for compounds 5 and 6 for further ac susceptibility measurements, but they did not observe the slow relaxation of magnetization.
Degree Year: 2010
Author: Ke Red Hill
Degree-granting unit: Changchun University of Technology
Keywords: Schiff base;; polydentate ligand;; earth;; magnetic;; clusters
Summary:
In this paper a multi-tooth Schiff base http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets ligands with transition metal and / or the reaction of eight rare-earth compounds were analyzed for their crystal structure and magnetic properties of the test.
Crystal structure analysis shows that compound 7 (C_ (88) H_ (126) N_4Pr_ (10) O_ (66)) and 8 (C_ (90) H_ (130) N_4Nd_ (10) O_ (66)) is the same structure, but also in the compound 2 (C_ (54) H_ (82) N_4O_ (34) Cl_2Mn_4) and 5 (C_ (66) H_ (126) N_4O_ (50) Cl_2Mn_4Nd_2), 6 (C_ (96) H_ (148) N_6O_ (70 ) Dy_ (10)) ,7-8 in two different ligand coordination modes and metal coordination, more interesting is that in compound 6 groups, Neodymium Magnets we found five different acid base coordination mode of the co-existence, However, compounds 7 and 8 are only three different acid base groups co-exist with the bit pattern.
Magnetic tests show that all compounds intramolecular antiferromagnetic interaction exists, but also for compounds 5 and 6 for further ac susceptibility measurements, but they did not observe the slow relaxation of magnetization.
Degree Year: 2010
help new Schiff base catalyst with arginine under the catalytic polymerization of methyl methacrylate
Title: help new Schiff base catalyst with arginine under the catalytic polymerization of methyl methacrylate Author: Qin Minrui Degree-granting unit: Zhejiang University Keywords: L-arginine Schiff base;; helpless catalyst;; catalyzed polymerization;; methyl methacrylate Summary: Schiff base is the second after the Ziegler-Natta catalyst, a class of polar monomer can catalyze the polymerization catalyst, and its low cost, easy preparation, high catalytic activity. Synthesized salicylaldehyde Schiff base and its derivatives reduced arginine and its metal complexes, for the first time the series of complexes used in catalytic methyl methacrylate Neodymium Magnets alone (MMA) polymerization reaction. Papers selected for the natural amino acid L-arginine precursors, respectively, with 3,4 - dihydroxybenzaldehyde, 2,4 - dihydroxybenzaldehyde and salicylaldehyde condensation 3,4 - dihydroxybenzaldehyde reduced arginine acid Schiff base (3,4-HDIA), 2,4 - dihydroxybenzaldehyde arginine reduced Schiff base (2,4-HDIA), Schiff base salicylaldehyde arginine (HSALA), and these Schiff bases have been characterized. The synthesized Schiff base as ligands, respectively, and transition metal Cu (Ⅱ), Co (Ⅱ), Ni (Ⅱ) and rare earth ions, synthesis of a series of amino acid Schiff base - metal complexes. Complexes by elemental analysis and characterized by means of UV spectra analysis. This paper focuses on the catalyst under the conditions of the helpless, to L-arginine Schiff base - metal complexes as single component methyl methacrylate polymerization catalysts, with the viscosity measurement of polymer molecular weight, by ~ 1H NMR and GPC regularity of three-dimensional polymer and molecular weight distribution, respectively, were characterized. First, compare the different transition metal Schiff base complexes catalytic activity, get 3,4 - dihydroxybenzaldehyde reduced arginine Schiff base Cu complexes [Cu (3,4-DIA) (H_2O)] Cl · H_2O in These complexes show the highest catalytic activity, but experiments show that the same catalytic conditions, the anion effect on the catalytic activity, affecting the results are: chloride ion complexes from the outside world when the monomer conversion rate is highest. Second, the optimized polymerization conditions, when n (MMA): n (M) = 2000, [MMA] = 3.33mol / L, 80 ℃, 20h is the best condition. Found that the series of complexes, especially [Cu (3,4-DIA) (H_2O)] Cl · H_2O polymerization of methyl methacrylate showed higher catalytic activity, a very small amount of catalyst can be achieved from the conversion http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets rate 97.8%, molecular weight 560 000, molecular weight distribution range of about 2.0. Syndiotactic content of 61%. Study of rare earth complexes are helpless under the conditions of the catalyst alone catalyzed polymerization of methyl methacrylate (MMA) of the catalytic activity, focusing on the 3,4 - dihydroxybenzaldehyde reduced arginine Schiff base neodymium complex [ Nd (3,4-HDIA) (H_2O) 2 (Cl)] Cl_2 · C_2H_5OH catalytic performance, optimization of reaction conditions obtained in the same dioxane as the solvent, n (MMA): n (Nd) = 2000,80 ℃, 20 h, the optimum conditions for the polymerization reaction. The series of complexes of rare earth catalytic polymerization of MMA monomer conversion rate of 93.1%, the molecular weight of up to one million. Degree Year: 2010
Dy ~ (3) doped GeS_2 base properties of chalcogenide glass
Title: Dy ~ (3) doped GeS_2 base properties of chalcogenide glass
Author: Liu Lei
Degree-granting unit: Changchun University of Technology
Keywords: mid-infrared laser;; energy transfer;; radiative transition;; phonon energy
Summary:
Mid-infrared laser as in the civilian and military aspects of the important applications, has been more and more people's attention. Chalcogenide glass as a low phonon energy, wide infrared transmission window, the higher refractive index, good chemical stability and thermal stability of the advantages, so it is more appropriate mid-infrared laser matrix glass. Chalcogenide glass to improve some of the radiative transition probability of rare earth ions, reducing the multi-phonon relaxation rate, which can be observed in a number of oxide glass is usually a new quenching of fluorescence emission.
Dy ~ (3) In addition to a very important Neodymium Magnets near-infrared wavelength 1.31μm emission, but also has two important mid-infrared fluorescent output, respectively, 2.9μm (~ 6H_ (13 / 2) → ~ 6H_ (15 / 2)) and 4.3μm (~ 6H_ (11 / 2) → ~ 6H_ (13 / 2)). In the absence of a suitable pump source and Dy ~ (3) the larger the level of non-radiative transition between the probability of fluorescence intensity of these two very small. Tm ~ (3) of ~ 3H_4 level can efficiently absorb the 808nm pump light, and Tm ~ (3) and Dy ~ (3) exists between the efficiency of energy transfer, so the co-doped Tm ~ (3) the can effectively solve this problem.
Ge-Ga-S-CdS glass due to higher http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets rare earth solubility, it is more appropriate matrix glass. This article in the glass system for the Tm ~ (3), Dy ~ (3) mechanism of energy transfer.
Through the adjustment of the glass composition, the glass can effectively reduce the phonon energy and electron - phonon coupling strength, thereby increasing the excitation intensity of rare earth ions. Based on the Ge-Ga-S-CdI_2 glass composition adjustment, study CdI_2 of Dy ~ (3) optical properties.
Degree Year: 2010
Author: Liu Lei
Degree-granting unit: Changchun University of Technology
Keywords: mid-infrared laser;; energy transfer;; radiative transition;; phonon energy
Summary:
Mid-infrared laser as in the civilian and military aspects of the important applications, has been more and more people's attention. Chalcogenide glass as a low phonon energy, wide infrared transmission window, the higher refractive index, good chemical stability and thermal stability of the advantages, so it is more appropriate mid-infrared laser matrix glass. Chalcogenide glass to improve some of the radiative transition probability of rare earth ions, reducing the multi-phonon relaxation rate, which can be observed in a number of oxide glass is usually a new quenching of fluorescence emission.
Dy ~ (3) In addition to a very important Neodymium Magnets near-infrared wavelength 1.31μm emission, but also has two important mid-infrared fluorescent output, respectively, 2.9μm (~ 6H_ (13 / 2) → ~ 6H_ (15 / 2)) and 4.3μm (~ 6H_ (11 / 2) → ~ 6H_ (13 / 2)). In the absence of a suitable pump source and Dy ~ (3) the larger the level of non-radiative transition between the probability of fluorescence intensity of these two very small. Tm ~ (3) of ~ 3H_4 level can efficiently absorb the 808nm pump light, and Tm ~ (3) and Dy ~ (3) exists between the efficiency of energy transfer, so the co-doped Tm ~ (3) the can effectively solve this problem.
Ge-Ga-S-CdS glass due to higher http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets rare earth solubility, it is more appropriate matrix glass. This article in the glass system for the Tm ~ (3), Dy ~ (3) mechanism of energy transfer.
Through the adjustment of the glass composition, the glass can effectively reduce the phonon energy and electron - phonon coupling strength, thereby increasing the excitation intensity of rare earth ions. Based on the Ge-Ga-S-CdI_2 glass composition adjustment, study CdI_2 of Dy ~ (3) optical properties.
Degree Year: 2010
2011年12月21日星期三
Europium, terbium-doped phosphor down-conversion Preparation and Properties
Title: Europium, terbium-doped phosphor down-conversion Preparation and Properties
Author: Ran Miao Committee
Degree-granting unit: Zhengzhou University
Keywords: CaF_2;; Eu;; terbium;; doping;; nm;; fluorescent material
Summary:
Over the years, it has not stopped the development of new luminescent materials and explore. The unique electronic structure of rare earth ions, so that rare-earth doped luminescent materials have photochemical stability, and long fluorescence lifetime, quantum yield, narrow emission spectra, Stokes shift and large distinct advantages. Therefore, lanthanide-doped Neodymium magnets luminescent materials has been one focus of research. Eu3, Tb3 red and green phosphors are most commonly used activator of the most important, is that people study the focus of attention. This paper mainly for europium, terbium-doped phosphor down-conversion and water-soluble preparation of some work, the main contents are summarized as follows:
1 for methanol as reaction solvent, co-precipitation method, without using any surfactant in the case, the system had hydrophilic CaF2: Ln3 nanoparticles, these particles can be well dispersed in water, and the particle distribution, average diameter of about 20nm, no agglomeration. This method is simple, reproducible, high yield, very suitable for mass production.
(2) were used polyvinylpyrrolidone (PVP) and citric acid as a surfactant, co-precipitation method and hydrothermal method had hydrophilic CaF2: Ln3 nanoparticles, these particles can be well dispersed in water, and a detailed study of its structure and fluorescent properties.
3 usually spherical CaF2: Eu3 particles difficult to obtain, through this paper TEOS catalyzed hydrolysis of monodisperse spherical SiO2 particles, and then under the action of other active agent, coated on its surface a layer with fluorescent properties of CaF2: Eu3, so that the system had a spherical light-emitting materials, but also saves rare earth elements.
4 synthesized by hydrothermal method and PO43-ions Eu3 codoped CaPxW1-xO4: Eu3 nano-materials by XRD, TEM, and fluorescence spectroscopy http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php show that the particle is a typical scheelite structure; morphology was rod; PO43 - ion incorporation can effectively adjust the spectral intensity, changing the doping concentration of PO43-ion emission intensity of fluorescence obtained in different materials.
Degree Year: 2010
Author: Ran Miao Committee
Degree-granting unit: Zhengzhou University
Keywords: CaF_2;; Eu;; terbium;; doping;; nm;; fluorescent material
Summary:
Over the years, it has not stopped the development of new luminescent materials and explore. The unique electronic structure of rare earth ions, so that rare-earth doped luminescent materials have photochemical stability, and long fluorescence lifetime, quantum yield, narrow emission spectra, Stokes shift and large distinct advantages. Therefore, lanthanide-doped Neodymium magnets luminescent materials has been one focus of research. Eu3, Tb3 red and green phosphors are most commonly used activator of the most important, is that people study the focus of attention. This paper mainly for europium, terbium-doped phosphor down-conversion and water-soluble preparation of some work, the main contents are summarized as follows:
1 for methanol as reaction solvent, co-precipitation method, without using any surfactant in the case, the system had hydrophilic CaF2: Ln3 nanoparticles, these particles can be well dispersed in water, and the particle distribution, average diameter of about 20nm, no agglomeration. This method is simple, reproducible, high yield, very suitable for mass production.
(2) were used polyvinylpyrrolidone (PVP) and citric acid as a surfactant, co-precipitation method and hydrothermal method had hydrophilic CaF2: Ln3 nanoparticles, these particles can be well dispersed in water, and a detailed study of its structure and fluorescent properties.
3 usually spherical CaF2: Eu3 particles difficult to obtain, through this paper TEOS catalyzed hydrolysis of monodisperse spherical SiO2 particles, and then under the action of other active agent, coated on its surface a layer with fluorescent properties of CaF2: Eu3, so that the system had a spherical light-emitting materials, but also saves rare earth elements.
4 synthesized by hydrothermal method and PO43-ions Eu3 codoped CaPxW1-xO4: Eu3 nano-materials by XRD, TEM, and fluorescence spectroscopy http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php show that the particle is a typical scheelite structure; morphology was rod; PO43 - ion incorporation can effectively adjust the spectral intensity, changing the doping concentration of PO43-ion emission intensity of fluorescence obtained in different materials.
Degree Year: 2010
North China in the western margin of a major Precambrian geological events
Title: North China in the western margin of a major Precambrian geological eventsAuthor: Gong RuijunDegree-granting units: Chengdu University of TechnologyKeywords: North China margin of;; Precambrian;; geological eventsSummary:
Western margin of North China is a country in Precambrian strata exposed one of the more complete, this area has been found in Precambrian strata there are many important output of mineral resources, such as copper, lead, zinc, gold and rare earth elements Neodymium magnets and other metal mineral resources. China Nuclear Industry Geological Bureau based on a research project "in the western part of North China margin of the Precambrian uranium ore-forming conditions and prospecting direction", the author produced in North China by the western margin of Precambrian strata in the special Large deposits of large-scale geological features of the analysis and isotopic data, that the existence of four major geological events, are Neoarchean geological events (> 2500Ma), Paleoproterozoic geological events (2500 ~ 1800Ma), Mesoproterozoic geological events (1800 ~ 1000Ma) and the Paleozoic - Mesozoic geological events (543 ~ 65Ma).
(1) Archean geological events mainly 2700Ma mafic volcanism, 2500Ma in acidic magmatism and the development of extensive and intense metamorphism; this period mainly formed Archean granite - greenstone belt of gold deposits, of banded iron deposits, as well as high-grade metamorphic rocks of the graphite deposits.
(2) Paleoproterozoic major geological event occurred in 2350 ~ 2100Ma and 2100 ~ 1800Ga during orogenic events during the acid with a large number of granitic magma activity of the Archean granite-greenstone belt overlay transformation, substances into gold, forming gold deposits Paishanlou; Proterozoic lead-zinc mineralization is an important period, the region Caijiaying the formation of Pb-Zn deposits with the period of construction is closely related to thermal events.
(3) Mesoproterozoic geological events are the most important metallogenic study area events, mainly for the early Proterozoic (1800Ma ~ 1300Ma) north of the ancient continental breakup event and the late Mesoproterozoic (1300Ma ~ 1000Ma) convergence event, and the formation of the Wolf - aulacogen residue Altay Mountains and the Bayan Obo aulacogen two aulacogen. Produced a large number of Proterozoic large deposits, such as Nb deposit Bayan Obo rare earth iron, Wolf - sulfur residue Altay Mountain polymetallic mineralization belt, high-plate River lead and zinc - pyrite ore, ferro-vanadium deposits in Temple , and manganese ore beds.
(4) Paleozoic - Mesozoic geological event is mainly on the substrate before the formation of structural transformation, cracking put together, accompanied by intense magmatism and mineralization associated with the intrusion, especially in the Hercynian and http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php Yanshanian magmatic activity extremely frequent. The formation of Dongping gold deposit, gold deposits and other cliff valley ear.
Precambrian strata in the study area of gold, copper, lead and zinc, manganese, iron ore, rare earth minerals and other deposits are affected by regional faults and magmatic belt control. In addition to Xing and graphite mine only by Precambrian regional metamorphism affected. Mineral Deposits has a multistage, additive, especially in gold deposits.Degree Year: 2010
Western margin of North China is a country in Precambrian strata exposed one of the more complete, this area has been found in Precambrian strata there are many important output of mineral resources, such as copper, lead, zinc, gold and rare earth elements Neodymium magnets and other metal mineral resources. China Nuclear Industry Geological Bureau based on a research project "in the western part of North China margin of the Precambrian uranium ore-forming conditions and prospecting direction", the author produced in North China by the western margin of Precambrian strata in the special Large deposits of large-scale geological features of the analysis and isotopic data, that the existence of four major geological events, are Neoarchean geological events (> 2500Ma), Paleoproterozoic geological events (2500 ~ 1800Ma), Mesoproterozoic geological events (1800 ~ 1000Ma) and the Paleozoic - Mesozoic geological events (543 ~ 65Ma).
(1) Archean geological events mainly 2700Ma mafic volcanism, 2500Ma in acidic magmatism and the development of extensive and intense metamorphism; this period mainly formed Archean granite - greenstone belt of gold deposits, of banded iron deposits, as well as high-grade metamorphic rocks of the graphite deposits.
(2) Paleoproterozoic major geological event occurred in 2350 ~ 2100Ma and 2100 ~ 1800Ga during orogenic events during the acid with a large number of granitic magma activity of the Archean granite-greenstone belt overlay transformation, substances into gold, forming gold deposits Paishanlou; Proterozoic lead-zinc mineralization is an important period, the region Caijiaying the formation of Pb-Zn deposits with the period of construction is closely related to thermal events.
(3) Mesoproterozoic geological events are the most important metallogenic study area events, mainly for the early Proterozoic (1800Ma ~ 1300Ma) north of the ancient continental breakup event and the late Mesoproterozoic (1300Ma ~ 1000Ma) convergence event, and the formation of the Wolf - aulacogen residue Altay Mountains and the Bayan Obo aulacogen two aulacogen. Produced a large number of Proterozoic large deposits, such as Nb deposit Bayan Obo rare earth iron, Wolf - sulfur residue Altay Mountain polymetallic mineralization belt, high-plate River lead and zinc - pyrite ore, ferro-vanadium deposits in Temple , and manganese ore beds.
(4) Paleozoic - Mesozoic geological event is mainly on the substrate before the formation of structural transformation, cracking put together, accompanied by intense magmatism and mineralization associated with the intrusion, especially in the Hercynian and http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php Yanshanian magmatic activity extremely frequent. The formation of Dongping gold deposit, gold deposits and other cliff valley ear.
Precambrian strata in the study area of gold, copper, lead and zinc, manganese, iron ore, rare earth minerals and other deposits are affected by regional faults and magmatic belt control. In addition to Xing and graphite mine only by Precambrian regional metamorphism affected. Mineral Deposits has a multistage, additive, especially in gold deposits.Degree Year: 2010
AZ31B magnesium alloy micro-arc oxidation ceramic coating after the preparation and sealing technology research
Title: AZ31B magnesium alloy micro-arc oxidation ceramic coating after the preparation and sealing technology research Author: Qi Sufang Degree-granting unit: Harbin Institute of Technology Key words: magnesium alloy;; micro-arc oxidation;; sealing;; corrosion resistance Summary:
Magnesium has many excellent properties, but due to poor corrosion resistance limits its wider application. The issue for the poor corrosion resistance of magnesium alloy problem in Na2SiO3 electrolyte system, the use of micro-arc oxidation Neodymium Magnets method and sealing technology in AZ31B magnesium alloy sheet surface corrosion resistance of the film prepared in situ to study the micro-arc oxidation process parameters, Ce doping and sealing process on the film structure and properties of the law, and the film in 3.5% NaCl solution in the preliminary analysis of the corrosion mechanism.
X-ray diffraction (XRD), scanning electron microscopy (SEM), electron spectroscopy (EDS), test methods, analysis of the film phase and elemental composition of the observed ceramic coating surface and cross section morphology; the use of eddy current thickness test film thickness; use of scarification, heat shock experiments investigated the binding force of the film, using CHI660 electrochemical tester, salt spray corrosion resistance of ceramic membrane can be.
The results show that the micro-arc oxidation ceramic coating mainly composed of MgO and Mg_2SiO_4 two-phase, porous structure. Ceramic film thickness, roughness with reaction time, increased with increasing current density; as the frequency increases, the ceramic coating thickness decreases, the roughness decreases; As the duty cycle increases, the ceramic film thickness and roughness showed the first increase and then decreased. To uniform corrosion and electrochemical corrosion test methods for evaluating the optimization of process parameters, the result is a frequency of 300Hz, 45% duty cycle, current density 2A/dm ~ 2, the reaction time was 5min, optimization of process parameters prepared ceramic membrane compared with the magnesium matrix, corrosion current density three orders of magnitude lower. The use of cerium conversion coating, the electrolyte by adding cerium, cerium and other methods to expand penetration in the introduction of Ce in the ceramic membrane, the results show that the micro-arc oxidation before the cerium conversion coating, not only can reduce the arc voltage, and can improve the corrosion resistance .
By boiling water sealing, impregnation - sealing dip coating method, air sealing methods such as spray coating on the ceramic sealing, boiling water sealing structure of the ceramic coating and corrosion resistance is not obvious, dip - dip coating seal holes in the ceramic coating can be formed on the surface coating layer 2 ~ 5μm, in part or all of the ceramic http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets coating to seal the surface of the hole, making the corrosion resistance of the film has significantly improved. Sealing air spray paint ceramic coating can be formed on the surface coating layer of about 15μm, could seal the entire surface of the hole blocking layer can greatly improve the corrosion resistance of the film, the film can maintain 144h salt spray test in good condition. Degree Year: 2010
Magnesium has many excellent properties, but due to poor corrosion resistance limits its wider application. The issue for the poor corrosion resistance of magnesium alloy problem in Na2SiO3 electrolyte system, the use of micro-arc oxidation Neodymium Magnets method and sealing technology in AZ31B magnesium alloy sheet surface corrosion resistance of the film prepared in situ to study the micro-arc oxidation process parameters, Ce doping and sealing process on the film structure and properties of the law, and the film in 3.5% NaCl solution in the preliminary analysis of the corrosion mechanism.
X-ray diffraction (XRD), scanning electron microscopy (SEM), electron spectroscopy (EDS), test methods, analysis of the film phase and elemental composition of the observed ceramic coating surface and cross section morphology; the use of eddy current thickness test film thickness; use of scarification, heat shock experiments investigated the binding force of the film, using CHI660 electrochemical tester, salt spray corrosion resistance of ceramic membrane can be.
The results show that the micro-arc oxidation ceramic coating mainly composed of MgO and Mg_2SiO_4 two-phase, porous structure. Ceramic film thickness, roughness with reaction time, increased with increasing current density; as the frequency increases, the ceramic coating thickness decreases, the roughness decreases; As the duty cycle increases, the ceramic film thickness and roughness showed the first increase and then decreased. To uniform corrosion and electrochemical corrosion test methods for evaluating the optimization of process parameters, the result is a frequency of 300Hz, 45% duty cycle, current density 2A/dm ~ 2, the reaction time was 5min, optimization of process parameters prepared ceramic membrane compared with the magnesium matrix, corrosion current density three orders of magnitude lower. The use of cerium conversion coating, the electrolyte by adding cerium, cerium and other methods to expand penetration in the introduction of Ce in the ceramic membrane, the results show that the micro-arc oxidation before the cerium conversion coating, not only can reduce the arc voltage, and can improve the corrosion resistance .
By boiling water sealing, impregnation - sealing dip coating method, air sealing methods such as spray coating on the ceramic sealing, boiling water sealing structure of the ceramic coating and corrosion resistance is not obvious, dip - dip coating seal holes in the ceramic coating can be formed on the surface coating layer 2 ~ 5μm, in part or all of the ceramic http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets coating to seal the surface of the hole, making the corrosion resistance of the film has significantly improved. Sealing air spray paint ceramic coating can be formed on the surface coating layer of about 15μm, could seal the entire surface of the hole blocking layer can greatly improve the corrosion resistance of the film, the film can maintain 144h salt spray test in good condition. Degree Year: 2010
ZZNAL4Y Modification of die-cast zinc alloy
Title: ZZNAL4Y Modification of die-cast zinc alloy Author: Wang Xiande Degree-granting units: Xiangtan University Keywords: zinc alloy;; alloying elements;; mechanical properties;; Microstructure Summary:
In China 三号 zinc-aluminum alloy (3.5% ~ 4.3% Al) found during the industrial applications, there are impurities in the alloy with higher levels of overall performance instability and other issues. In order to further improve its mechanical properties and maintain stable performance alloys, to meet the needs of industrial production, the status of research at home and Neodymium Magnets abroad, the alloys of this thesis the following research.
In the alloy on the basis of domestic ZZnAl4Y added silicon, manganese, boron, titanium and rare earth elements, optimize alloy performance. Use of medium frequency induction furnace and graphite crucible resistance furnace for melting of the alloy; the use of computer-controlled electronic universal testing machine testing tensile strength of the alloy; use of HR-150 Rockwell hardness testing machine and micro-hardness tester (HXD1000T) alloy hardness test; use JB30A impact testing machine test the impact toughness of alloy; with optical microscope, scanning electron microscopy, electron probe micro-analyzer test tools research and analysis of the alloy microstructure. Through the preparation of the specimens tested at room temperature mechanical properties and microstructure analysis, seeking the best elements in the alloy to add volume to obtain better performance of the die-casting zinc alloy.
The results showed that:
(1) silicon, manganese, zinc alloy elements in solid solution in a very small degree, manganese mainly hard and brittle manganese-rich phase exists mainly in the silicon single crystal silicon form. Silicon, manganese has the alloying effect, can be refined alloy, eutectic increased. Silicon, manganese was added to make ZZnAl4Y tensile strength and hardness of zinc alloy is greatly improved, but the ductility and impact toughness decrease more. When adding 0.06 ~ 0.1wt.% Si and 0.05 ~ 0.1wt.% Mn element ZZnAl4Y zinc alloy has good mechanical properties.
(2) zinc alloy elements added boron, boron compounds produced η phase as an effective heterogeneous nucleation, increasing the nucleation rate of the η phase, η phase has been refined to make primary. When the added amount of boron is 0.05wt.% When the preparation of the zinc alloy has good mechanical properties.
(3) adding titanium zinc alloy, the aluminum alloy of titanium compounds produced (TiAl_3, TiAl_2, etc.), titanium-zinc compounds (Zn_16Ti, Zn_8Ti, etc.) and ternary compounds, these compounds are beneficial to enhance the nucleation rate η , refinement matrix structure. As the Ti content increases, the tensile strength and zinc-aluminum alloy first increases and then decreases elongation at break; hardness first increased and then decreased; to reduce the impact http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets toughness decreased but not much. Titanium content of 0.04wt.% ~ 0.05wt.%, The test alloy to obtain better mechanical properties.
(4) rare earth elements in Al, Zn in the solid solubility is very small, rare earth elements in the alloy will be added to the solution and the solution of zinc alloy, aluminum and other elements to form compounds of complex composition (such as LaZn_13, LaZn_8, LaB_9 , LaB_6, LaB_4), these compounds can increase the nucleation rate of the η phase, refine the alloy, is conducive to alloy to improve overall performance. Degree Year: 2010
In China 三号 zinc-aluminum alloy (3.5% ~ 4.3% Al) found during the industrial applications, there are impurities in the alloy with higher levels of overall performance instability and other issues. In order to further improve its mechanical properties and maintain stable performance alloys, to meet the needs of industrial production, the status of research at home and Neodymium Magnets abroad, the alloys of this thesis the following research.
In the alloy on the basis of domestic ZZnAl4Y added silicon, manganese, boron, titanium and rare earth elements, optimize alloy performance. Use of medium frequency induction furnace and graphite crucible resistance furnace for melting of the alloy; the use of computer-controlled electronic universal testing machine testing tensile strength of the alloy; use of HR-150 Rockwell hardness testing machine and micro-hardness tester (HXD1000T) alloy hardness test; use JB30A impact testing machine test the impact toughness of alloy; with optical microscope, scanning electron microscopy, electron probe micro-analyzer test tools research and analysis of the alloy microstructure. Through the preparation of the specimens tested at room temperature mechanical properties and microstructure analysis, seeking the best elements in the alloy to add volume to obtain better performance of the die-casting zinc alloy.
The results showed that:
(1) silicon, manganese, zinc alloy elements in solid solution in a very small degree, manganese mainly hard and brittle manganese-rich phase exists mainly in the silicon single crystal silicon form. Silicon, manganese has the alloying effect, can be refined alloy, eutectic increased. Silicon, manganese was added to make ZZnAl4Y tensile strength and hardness of zinc alloy is greatly improved, but the ductility and impact toughness decrease more. When adding 0.06 ~ 0.1wt.% Si and 0.05 ~ 0.1wt.% Mn element ZZnAl4Y zinc alloy has good mechanical properties.
(2) zinc alloy elements added boron, boron compounds produced η phase as an effective heterogeneous nucleation, increasing the nucleation rate of the η phase, η phase has been refined to make primary. When the added amount of boron is 0.05wt.% When the preparation of the zinc alloy has good mechanical properties.
(3) adding titanium zinc alloy, the aluminum alloy of titanium compounds produced (TiAl_3, TiAl_2, etc.), titanium-zinc compounds (Zn_16Ti, Zn_8Ti, etc.) and ternary compounds, these compounds are beneficial to enhance the nucleation rate η , refinement matrix structure. As the Ti content increases, the tensile strength and zinc-aluminum alloy first increases and then decreases elongation at break; hardness first increased and then decreased; to reduce the impact http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets toughness decreased but not much. Titanium content of 0.04wt.% ~ 0.05wt.%, The test alloy to obtain better mechanical properties.
(4) rare earth elements in Al, Zn in the solid solubility is very small, rare earth elements in the alloy will be added to the solution and the solution of zinc alloy, aluminum and other elements to form compounds of complex composition (such as LaZn_13, LaZn_8, LaB_9 , LaB_6, LaB_4), these compounds can increase the nucleation rate of the η phase, refine the alloy, is conducive to alloy to improve overall performance. Degree Year: 2010
NaYF_4: Er ~ (3) / Yb ~ (3) enhanced upconversion luminescence and spectral design
Title: NaYF_4: Er ~ (3) / Yb ~ (3) enhanced upconversion luminescence and spectral design
Author: Wu Li
Degree-granting unit: Harbin Institute of Technology
Keywords: fluoride;; Er ~ (3) ion;; luminescence enhancement;; nanorods;; spectrum regulation
Summary:
Light rare-earth doped nanocrystals in solar cells, biomarkers, light-emitting devices, laser anti-counterfeiting and other areas has broad application prospects. The low-conversion luminescence efficiency is to limit its practical application of the main factors. Magnetic lifter Upconversion luminescence intensity increased exploration methods, not only has important theoretical research value, but also has important practical significance. NaYF_4: Er ~ (3) / Yb ~ (3) a combination of nano-crystalline because of its strong and rich luminous intensity and fluorescence spectra of wide public concern. Papers mainly focus on "NaYF_4: Er ~ (3) / Yb ~ (3) enhanced upconversion luminescence and spectral design" to carry out family research.
Oil were prepared using different sizes of hot-cubic phase and hexagonal phase of NaYF_4: Er ~ (3) / Yb ~ (3) nanoparticles and nanocrystalline columnar. By changing the reaction time, reaction temperature and adjust the ratio of rare earth ions NH4F/NaF and develop a better preparation of upconversion fluorescence properties of hexagonal columnar nanocrystalline NaYF_4 new method. By infrared absorption spectra and fluorescence spectra of the probe, to clarify the enhancement mechanism of upconversion.
Have explored the use of columnar nanocrystals synthesis, synthesis batch NaYF_4: Er ~ (3) / Yb ~ (3) nanorods change the sensitizer Yb ~ (3) concentration, while maintaining the nanocrystal shape and crystal lattice structure remains unchanged, successfully introduced a way to improve upconversion luminescence intensity and spectral adjustment http://www.999magnet.com/products/131-magnetic-lifter method for the acquisition of monochrome red light indicates a new direction, and fluoride proved Er ~ (3) and Yb ~ (3) ions in the presence of reverse energy transfer process.
In NaYF_4: Er_ (0.02) ~ (3) / Yb_ (0.2) ~ (3) of the rare earth materials, the introduction of the new-doped ion - Ce ~ (3) ion, the use of Ce ~ (3) and Er ions ~ (3) ion energy levels match the special relationship between the cross-relaxation through the level, successfully Er ~ (3) up-conversion fluorescence spectra of regulation, a single green upconversion provides access to a new idea .
Degree Year: 2010
Author: Wu Li
Degree-granting unit: Harbin Institute of Technology
Keywords: fluoride;; Er ~ (3) ion;; luminescence enhancement;; nanorods;; spectrum regulation
Summary:
Light rare-earth doped nanocrystals in solar cells, biomarkers, light-emitting devices, laser anti-counterfeiting and other areas has broad application prospects. The low-conversion luminescence efficiency is to limit its practical application of the main factors. Magnetic lifter Upconversion luminescence intensity increased exploration methods, not only has important theoretical research value, but also has important practical significance. NaYF_4: Er ~ (3) / Yb ~ (3) a combination of nano-crystalline because of its strong and rich luminous intensity and fluorescence spectra of wide public concern. Papers mainly focus on "NaYF_4: Er ~ (3) / Yb ~ (3) enhanced upconversion luminescence and spectral design" to carry out family research.
Oil were prepared using different sizes of hot-cubic phase and hexagonal phase of NaYF_4: Er ~ (3) / Yb ~ (3) nanoparticles and nanocrystalline columnar. By changing the reaction time, reaction temperature and adjust the ratio of rare earth ions NH4F/NaF and develop a better preparation of upconversion fluorescence properties of hexagonal columnar nanocrystalline NaYF_4 new method. By infrared absorption spectra and fluorescence spectra of the probe, to clarify the enhancement mechanism of upconversion.
Have explored the use of columnar nanocrystals synthesis, synthesis batch NaYF_4: Er ~ (3) / Yb ~ (3) nanorods change the sensitizer Yb ~ (3) concentration, while maintaining the nanocrystal shape and crystal lattice structure remains unchanged, successfully introduced a way to improve upconversion luminescence intensity and spectral adjustment http://www.999magnet.com/products/131-magnetic-lifter method for the acquisition of monochrome red light indicates a new direction, and fluoride proved Er ~ (3) and Yb ~ (3) ions in the presence of reverse energy transfer process.
In NaYF_4: Er_ (0.02) ~ (3) / Yb_ (0.2) ~ (3) of the rare earth materials, the introduction of the new-doped ion - Ce ~ (3) ion, the use of Ce ~ (3) and Er ions ~ (3) ion energy levels match the special relationship between the cross-relaxation through the level, successfully Er ~ (3) up-conversion fluorescence spectra of regulation, a single green upconversion provides access to a new idea .
Degree Year: 2010
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