Pr基合金晶界扩散对烧结钕铁硼性能和结构的影响
Effect of grain boundary diffusion of Pr-based alloy on the properties and structure of sintered NdFeB
徐俊 1查善顺 1雷燕 1何凡 1刘友好 1陈静武1
作者信息
- 1. 安徽大地熊新材料股份有限公司,稀土永磁材料国家重点实验室,安徽 合肥 231500
- 折叠
摘要
通过丝网印刷涂敷技术,在烧结钕铁硼磁体表面分别涂敷了 Pr、Pr96Al4、Pr83Cu17、Pr80Co20涂层,并对其进行晶界扩散热处理.对比分析了扩散后磁体的磁性能、温度稳定性、相结构和微观结构.结果表明:扩散磁体的内禀矫顽力提高4 kOe以上,增幅超35％,剩磁降低0.3 kGs以内,降幅小于3％;扩散磁体的高温矫顽力明显提升,高温剩磁、剩磁温度系数和矫顽力温度系数基本不变,扩散Pr80Co20磁体的居里温度提升了 7.3 ℃;扩散源沿晶界扩散进入磁体内部,使得晶界富稀土相明显增多,有效地隔离了主相晶粒.
Abstract
Pr,Pr96Al4,Pr83Cu17 and Pr80 Co20 coatings were applied to the surface of sintered NdFeB magnets by screen printing technology,and the grain boundary diffusion heat treatment was carried out.The magnetic proper-ties,temperature stability,phase structure and microstructure of the diffused magnets were compared and analyzed.The results show that the intrinsic coercivity of the diffused magnets was increased by more than 4 kOe,an increase of more than 35％,and the remanence was reduced by less than 0.3 kGs,a decrease of less than 3％.The high-temperature coercivity of the diffused magnets were significantly improved,the high-temperature remanence,rema-nence temperature coefficient and coercivity temperature coefficient were basically unchanged,and the Curie temper-ature of the Pr80Co20 diffused magnet was increased by 7.3 ℃.The diffusion source diffuses into the magnet along the grain boundary,which significantly increases the number of RE-rich phase in the grain boundary,effectively iso-lating the main phase grains.
关键词
钕铁硼/Pr基合金/晶界扩散/矫顽力/微观结构/温度稳定性Key words
NdFeB/Pr-based alloy/grain boundary diffusion/coercive force/microstructure/temperature stability引用本文复制引用
出版年
2024
NETL
NSTL
万方数据