nanocomposite;ttrium substitution;glass forming

作者:龙风;施毅;刘方;倪志鹏;
关键词:quench detection,quench protection,balancing-bridge
单位:Institute of Plasma Physics,Chinese Academy of Sciences;
摘要:A NbTi 7 T superconducting magnet with a 338 mm bore system

was rebuilt and the first experiment was carried out in

Jan.2009.The balancing-bridge method used for the quench

detection system is analyzed and an improvement of the principle

of balancing-bridge conformation is given.The inductances of the

coils are calculated to estimate the proportion of the bridge

arms.The appropriate parameters are selected for the balancing-

bridge.


作者:陈治安;罗骥;隋延力;郭志猛;
关键词:nanocomposite;ttrium substitution;glass forming y

ability;residual amorphous phase;squareness;rare earths
单位:Institute of Powder Metallurgy,Block neodymium magnet
http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php University of Science and

Technology Beijing;State Key Laboratory for Advanced Metals and

Materials,University of Science and Technology Beijing;
摘要:The phase evolution,microstructure and magnetic properties

of Nd9-xYxFe72Ti2Zr2B15(x=0,0.5,1,2) nanocomposite ribbons were

investigated.It was found that substitution of Y enhanced glass

forming ability of the over-quenched ribbons and stabilized the

amorphous phase during post annealing treatment.Appropriate

content of Y substitution effectively refined the microstructure

and enhanced the remanence of the annealed samples.The residual

amorphous intergranular phase in the annealed sample improved the

squareness of loops,resulting in enhanced maximum energy

product.The optimum annealing treatment significantly improved

magnetic properties of the Y substituted ribbons.Best magnetic

properties,Jr=0.78 T,Hci=923.4 kA/m,(BH)max=98.5 kJ/m3 were

obtained from Nd8YFe72Ti2Zr2B15 ribbon spun at Vs =4 m/s,and

annealed at 700 °C for 10 min.