DISPROPORTIONATION IN ND16FE76B8-TYPE HYDRIDES

被引:77
作者
MCGUINESS, PJ
ZHANG, XJ
FORSYTH, H
HARRIS, IR
机构
[1] School of Metallurgy and Materials, The University of Birmingham, Birmingham, B152TT
来源
JOURNAL OF THE LESS-COMMON METALS | 1990年 / 162卷 / 02期
关键词
D O I
10.1016/0022-5088(90)90353-L
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This work has shown that heating Nd16Fe76B8-type materials in a hydrogen atmosphere, with subsequent vacuum annealing at greater than 750°C produces coercive powders which are suitable for the production of polymer-bonded magnets. A study of the material at different stages of the process has confirmed that the Nd-Fe-B alloy disproportionates into iron, Fe2B and neodymium hydride before recombining during the vacuum annealing stage to produce the fine-grained microstructure necessary for highly coercive material. The grain size of the final microstructure has been found to be very dependent on the temperature at which the hydrogenation-disproportionation-desorption cycle is carried out with optimum properties for the Nd16Fe76B8 alloy being obtained for a desorption temperature of 785°C for 1 h. © 1990.
引用
收藏
页码:379 / 387
页数:9
相关论文
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