The magnetic properties, thermal stability and microstructure of Nd-Fe-B/Ga sintered magnets prepared by blending method

被引:16
作者
Cheng, WH [1 ]
Li, W [1 ]
Li, CJ [1 ]
Dong, SZ [1 ]
机构
[1] Cent Iron & Steel Res Inst, Dept Funct Mat, Beijing 100081, Peoples R China
关键词
Nd-Fe-B; permanent magnets; atom diffusion; blending additions; thermal stability; microstructure; gallium;
D O I
10.1016/S0304-8853(01)00387-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of gallium added by blending method on the magnetic properties, thermal stability and microstructure of Nd16.5Dy16.0Fe53.45Co13.0B1.05 (wt%) sintered magnets was investigated. The experimental results show that an appropriate Ga. addition can markedly increase the coercivity. reduce the irreversible loss and slightly enhance the remanence. For instance, by adding 0.5 wt% Ga, the coercivity is increased from 1232 to 1819 kA/m, the irreversible loss after being exposed at 200 degreesC for 0.5 It is reduced from above 33% to below 5%. Microstructure analyses show that the grain boundaries of the magnets with and without Ga addition are substantially different. The grain boundaries of the Ga-free magnet are meandrous. On the other hand, most of the boundaries of Ga-containing magnets are straight and smooth. These characteristics can be explained by the appearance of new phases during sintering process. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码:274 / 278
页数:5
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