Ultra-high coercivity Sm-Co bulk magnets with remarkable thermal stability

被引：5
|
作者：
Park, Kwangjae [1 ,2 ]
Hirayama, Yusuke [2 ]
Wang, Jian [2 ]
Kobashi, Makoto [1 ]
机构：
[1] Nagoya Univ, Grad Sch Engn, Dept Mat Proc Engn, Nagoya 4648603, Japan
[2] Natl Inst Adv Ind Sci & Technol, Magnet Powder Met Res Ctr, 2266-98 Anagahora,Shimoshidami, Nagoya 4638560, Japan
来源：
SCRIPTA MATERIALIA | 2022年 / 218卷
关键词：
Sm-Co compound; Permanent magnet; Coercivity; Thermal stability; GRAIN-SIZE DEPENDENCE; COMPOUND; POWDER;
D O I：
10.1016/j.scriptamat.2022.114847
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The Sm-Co bulk magnet prepared in this work using unique Sm-Co alloy nanopowder as a precursor prepared by the lox oxygen-induction thermal plasma (LO-ITP) process displays a giant coercivity of 4.1 MA/m (52 kOe) at 300 K, which is the highest coercivity among the reported rare-earth permanent bulk magnets with high density. The Sm-Co magnet has a high coercivity of 2.4 MA/m (30 kOe) at 473 K and 1.6 MA/m (20 kOe) at 573 K, which shows the good temperature coefficient of coercivity of-0.22%/K. The well-organized microstructure with fine Sm-Co alloy single-crystal grains with an average grain size of 0.63 mu m, sharp grain boundary, and better crystallinity, leads to a huge coercivity and remarkable thermal stability.
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页数：6
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