各向异性粘结稀土永磁材料研究-中国材料进展

文章信息/Info

Author(s):: Yang Jinbo; Han Jingzhi; Liu Shunquan; Wang Changsheng; Du Honglin; Yang Yingchang; State Key Laboratory for Artificial Microstructure and Mesoscopic Physics and School of Physics, Peking University

摘要:: 本文综述了我们在各向异性R-Fe-N（R=Nd,Sm）和R-Fe-B(Nd,Pr)粘结永磁材料方面的研究结果。通过利用中子衍射、磁性测量、电镜等手段，紧密结合电子结构计算系统研究磁性材料结构和性质的关系，阐明了间隙原子效应提高R-Fe材料磁性的物理根源，提出了制备无缺陷单晶颗粒型各向异性永磁R-Fe-N磁粉的技术路线，以此为指导，开发出了高性能各向异性R-Fe-N磁性材料和磁体的产业化关键技术和设备，并建成了百吨级生产线。发现了织构型HDDR Nd-Fe-B 永磁粉形成的关键机制及其实现高矫顽力的方法，成功实现高性能HDDR (Pr,Nd)2Fe14B磁粉和高温度稳定性磁粉的稳定制备。研究了单相磁体和杂化磁体制备技术，制备了高性能的各向异性粘结磁体，为未来实现各向异性磁体大规模的生产进行了积极的探索。

Abstract:: This paper reported the results of the studying on anisotropic magnetic materials of R-Fe-N (R = Nd, Sm) and R2Fe14B (Nd, Pr). By means of neutron diffraction, magnetic measurements, electron microscope and electronic structure calculation, a systematic investigation has been made to understand the interstitial atom effects on the magnetic properties of the R-Fe compounds. By the understanding of the relationship among the intrinsic magnetic properties, the domain structure and fabrication process, high performance magnetic powders based on the 1:12 and 2:17 nitrides have been successfully produced in large scale. We have also investigated the formation mechanism for the high textured HDDR Nd-Fe-B magnetic powders, and successful fabricates HDDR (Pr,Nd)2Fe14B powders with high coercivity and high energy product . We have tried to develop key industrialization technologies for high-performance anisotropic R-Fe-N and R2Fe14B magnetic powders and magnets, and a 100-ton production line for R-Fe-N magnetic powders was built up. The high-performance anisotropic bonded magnet based on R-Fe-N and R2Fe14B were explored.