High-coercivity hot-deformed Nd-Fe-B permanent magnets processed by Nd-Cu eutectic diffusion under expansion constraint

被引：120
|
作者：
Akiya, T. [1 ]
Liu, J. [1 ,2 ]
Sepehri-Amin, H. [1 ]
Ohkubo, T. [1 ]
Hioki, K. [3 ]
Hattori, A. [3 ]
Hono, K. [1 ,2 ]
机构：
[1] Natl Inst Mat Sci, Elements Strategy Initiat Ctr Magnet Mat, Tsukuba, Ibaraki 3050047, Japan
[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058577, Japan
[3] Daido Steel Co Ltd, Nagoya, Aichi 4578545, Japan
来源：
SCRIPTA MATERIALIA | 2014年 / 81卷
基金：
日本科学技术振兴机构;
关键词：
Permanent magnet; Coercivity; Nd-Fe-B; Hot-deformed magnet; Diffusion process; ALLOYED ADDITIVES; GRAIN-SIZE; MICROSTRUCTURE; ENHANCEMENT;
D O I：
10.1016/j.scriptamat.2014.03.002
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The application of expansion constraint during the grain-boundary diffusion process using Nd70Cu30 eutectic alloy minimizes the remanence loss for the coercivity enhancement by optimizing the volume fraction of the Nd(Cu)-rich non-ferromagnetic intergranular layer. The diffusion-processed sample exhibits mu H-0(c) similar to 2 T,mu M-0(r) = 1.36 T and (BH)(max) = 358 kJ m(-3) at room temperature. Because of the low-temperature coefficient of coercivity, the magnet showed (BH)(max) similar to 191 kJ m(-3) at 200 degrees C, which is superior to that of Dy-containing high-coercivity sintered magnets. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：48 / 51
页数：4
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