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

SCRIPTA MATERIALIA

卷:81

Article

Akiya, T.¹  Liu, J.^1,2  Sepehri-Amin, H.¹  Ohkubo, T.¹  Hioki, K.³  Hattori, A.³  Hono, K.^1,2 

[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

关键词: Permanent magnet;    Coercivity;    Nd-Fe-B;    Hot-deformed magnet;    Diffusion process;   

DOI  :  10.1016/j.scriptamat.2014.03.002

来源: Elsevier

【 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.

【 授权许可】

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