Title: RE copper-nickel alloy of silver and performance
Author: Zhijun
Degree-granting unit: Harbin Institute of Technology
Keywords: electrical contact materials;; silver lanthanum alloy;; silver yttrium alloy;; hardness;; resistivity
Summary:
AgCuNi alloy because of its good electrical properties and good mechanical properties, so that in low-load electrical contact material has been widely used. But it also exist some disadvantages such as low recrystallization temperature, strength, low hardness, these disadvantages limit their application in the field of micro-motor. In this paper, rare-earth alloy elements to Neodymium Magnets improve the material's structure to improve their life. In this paper, optical microscope, X-Ray diffraction, electron microscopy, HXS-1000A-type micro Vickers hardness tester, analysis of the material microstructure, physical and mechanical properties of composite materials with traditional AgCuNi properties were compared.
The results show that in the cast structure, with the element yttrium content increases, the alloy grain size is getting smaller, and as the lanthanum content increases, the alloy grain growing; with the REE content of increase in silver yttrium alloy hardness gradually increased, while the hardness of silver alloy La no obvious regularity; mechanical properties superior to http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets the traditional AgCuNi alloy, while the material with good processing properties.
Electrical performance tests show that the percentage of cases, the same quality, silver alloy lanthanum yttrium alloy resistivity is less than the resistivity of silver. In the case of cast silver alloy with yttrium-yttrium content increased, the resistance increased significantly, while the silver alloy resistivity of La did not change significantly; in the annealed state, the silver and silver alloy lanthanum yttrium alloy resistivity compared to the cast are be reduced.
Degree Year: 2010
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