Dy gradient and coercivity in grain boundary diffusion processed Nd-Fe-B magnet

被引:1
|
作者
周磊 [1 ]
李建 [1 ,2 ]
程星华 [1 ]
刘涛 [1 ]
喻晓军 [1 ]
李波 [2 ]
机构
[1] Functional Materials Division, Advanced Technology & Materials Co., Ltd.
[2] China Iron & Steel Research Institute Group
关键词
Nd-Fe-B sintered magnet; grain boundary diffusion process; Dy content; coercivity; rare earths;
D O I
暂无
中图分类号
TM273 [永磁材料、永久磁铁];
学科分类号
0805 ; 080502 ; 080801 ;
摘要
By controlling Dy vapor deposition process, the amount of Dy that diffused into the magnet was increased gradually from 0.1 wt.% to 0.3 wt.%. Compared with the original status, the coercivity increment was not proportional to the Dy diffusion amount. Subsequent H;and Dy content gradient data showed that slope of the 0.3 wt.% sample gradient was bigger than that of 0.1 wt.% one, and the gaps between outer flakes and inner flakes enlarged with the increasement of Dy diffusion amount. Although Dy mostly enriched in triple-junction regions in electron-probe microscope analysis(EPMA) images, the following Auger depth graph showed that Dy content was as high as 3.0 at.% in 1.5 mm deep center. It proved that Dy tended to get into the main phase rather than stayed in the grain boundary during the diffusion process, and over-diffusion of Dy in the main phase was unhelpful for the coercivity enhancement.
引用
收藏
页码:559 / 566
页数:8
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