Coercivity enhancement of a Nd-Fe-B sintered magnet by diffusion of Nd70Cu30 alloy under pressure
Coercivity enhancement of a Nd-Fe-B sintered magnet by diffusion of Nd70Cu30 alloy under pressure
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DOI：
10.1016/j.scriptamat.2015.05.015
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发表时间：
2015-10-01
影响因子：
6
通讯作者：
Zhou, Gaofeng
中科院分区：
文献类型：
--
作者：
Chen, Fugang;Zhang, Tieqiao;Zhou, Gaofeng
在采用Nd 70 Cu 30共晶合金的晶界扩散工艺（GBDP）过程中施加压力，可使合金的矫顽力从退火态的1367 kA/m大幅度提高到1660 kA/m。由于有效扩散深度较大，提高了真空度分布的均匀性。在加压条件下进行GBDP后，磁体表面和中心均观察到连续的晶界相。在此基础上，讨论了微裂纹对磁性能的增强机理。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Application of pressure during grain boundary diffusion process (GBDP) using Nd70Cu30 eutectic alloy enhances the coercivity greatly from 1367 kA/m in the annealed state to 1660 kA/m. The uniformity of coercivity distribution was improved due to the large effective diffusion depth under pressure. Continuous grain boundary phase was observed both on the surface and in the center of the magnet after GBDP under pressure. Mechanism of coercivity enhancement due to micro cracks is discussed based on the observation. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.