烧结钕铁硼磁体矫顽力提升技术研究进展  

Progress of Coercivity Enhancement in Sintered NdFeB Magnets

作　　者：刘涛[1] 李瑞雨 周磊[1] 石晓宁 韦智元 任梦 郭新宇 Liu Tao;Li Ruiyu;Zhou Lei;Shi Xiaoning;Wei Zhiyuan;Ren Meng;Guo Xinyu(Advanced Technology&Materials Co.,Ltd.,Beijing 100081,China)

机构地区：[1]安泰科技股份有限公司,北京100081

出　　处：《中国稀土学报》2025年第1期44-56,共13页Journal of the Chinese Society of Rare Earths

基　　金：国家重点研发计划项目(2022YFB3504600)资助。

摘　　要：烧结钕铁硼永磁材料受矫顽力影响,热稳定性较差,在高温工作环境下易退磁,进一步影响磁体的服役特性。因此,行业内对于如何提高烧结钕铁硼磁体的矫顽力研究成为现阶段的重点工作,目前,通过合金化、晶粒细化、晶界掺杂和晶界扩散等技术可以显著提高钕铁硼磁体的矫顽力。基于以上背景,本文详细阐述了矫顽力的影响机理以及矫顽力提升技术的发展现状,系统分析了各工艺的优缺点,然后重点讨论了晶界扩散技术通过优化晶界相、增强各向异性场、增强退磁耦合作用来提高矫顽力的机制,并进一步归纳总结了影响晶界扩散的因素。最后,对未来中国烧结钕铁硼磁体矫顽力提升技术的发展趋势进行了展望,以期望促进中国烧结钕铁硼技术的发展。Limited by coercive force, sintered NdFeB permanent magnet material has poor thermal stability and is easy to demagnetize under high-temperature working environment, which further affects its service characteristics.Therefore, improving coercivity of sintered NdFeB magnets, including alloying, grain refinement, grain boundary doping and grain boundary diffusion, has become a key research work. Based on above backgrounds, the influence mechanisms and current development status of coercivity enhancement were elaborated, as well as advantages and disadvantages of each process were systematically analyzed. Then the coercivity-improving mechanisms by optimizing grain boundary phase, enhancing anisotropy field and demagnetization coupling are discussed, and the factors affecting grain boundary diffusion are summarized. Finally, with high prospection, the conclusion of development trend in coercivity enhancement technology of sintered NdFeB magnets in China is generalized.

关 键 词：烧结钕铁硼 矫顽力 热稳定性 晶界扩散技术 

分 类 号：TM273[一般工业技术—材料科学与工程]