Coercivity and thermal stability enhancement of Nd-Fe-B sintered magnets by grain boundary diffusion with Tb-Al-Cu alloys

被引:2
作者
Lee, Dong Hyun [1 ,2 ]
Kim, Seong Chan [1 ,3 ]
Kim, Jaehyuk [1 ,3 ]
Baek, Ju-Young [1 ]
Kim, Jong Tae [1 ]
Kim, Sumin [4 ]
Kim, Donghwan [5 ]
Lee, Sang Hyub [5 ]
Do, Dalhyun [3 ]
Kim, Dong Hwan [1 ]
Roh, Jong Wook [2 ]
Kim, Jeongmin [1 ]
机构
[1] DGIST, Div Nanotechnol, 333 Techno Jungang Daero, Daegu 42988, South Korea
[2] Kyungpook Natl Univ, Sch Nano & Mat Sci & Engn, Gyeongsangbuk Do 37224, South Korea
[3] Keimyung Univ, Dept Adv Mat Engn, 1095 Dalgubeol Daero, Daegu, South Korea
[4] Korea Inst Mat Sci, Dept Magnet Mat, Chang Won 51508, South Korea
[5] Star Grp, R&D Ctr, Daegu 42714, South Korea
基金
新加坡国家研究基金会;
关键词
Nd-Fe-B magne; Grain boundary diffusion process; Tb-Al-Cu alloy; Coercivity; Remanence; RICH PHASES; MICROSTRUCTURE; DIFFRACTION;
D O I
10.1016/j.mtla.2024.102161
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The enhancement of the magnetic properties of Nd-Fe-B sintered magnets was investigated using a grain boundary diffusion (GBD) process with serial Tb 80 Al (20-x) Cu x ( x = 5 - 15) (wt.%) alloy diffusion sources to evaluate the influence of non -rare earth metallic elements on the diffusion efficiency. In this study, an optimal Tb diffusion process was achieved at 850 degrees C for 6 h. The coercivity increments ( Delta H c j ) of the GBD-treated magnets were found to vary from 9.7 to 10.3 kOe and the highest value was obtained from a magnet diffused with a Tb 80 Al 5 Cu 15 alloy. The coercivity increments per wt.% Tb usage ( Delta H c j /wt.% Tb) of the alloy-GBD magnets were considerably higher than those of pure Tb-GBD magnets, which revealed a 20 % reduction in Tb usage. The improvement in magnetic thermal stability by Tb 80 (Al-Cu) 20 -GBD was also confirmed.
引用
收藏
页数:8
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