利用烧结钕铁硼废料制备的各向异性再生粘结磁体  

Anisotropic bonded magnets prepared from sintered Nd-Fe-B magnet wastes

作　　者：刘宇琨 肖俊儒 余红雅[1] 刘仲武[1] LIU Yu-kun;XIAO Jun-ru;YU Hong-ya;LIU Zhong-wu(School of Material Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《磁性材料及器件》2020年第5期20-25,共6页Journal of Magnetic Materials and Devices

摘　　要：利用烧结钕铁硼废料作为原料,直接机械破碎后制备了再生各向异性粘结磁体,研究了废料粉末粒度、固化时间和固化气氛对磁体性能、微观组织和各向异性的影响。结果表明,废料粉末的性能很大程度上决定了再生粘结磁体的性能。在150℃固化1~1.5 h可以获得较好的磁性能。氩气保护或真空条件对提高粘结磁体的性能也有重要作用。粉末粒度为40~80目、氩气保护固化1 h的条件下,获得的再生粘结磁体的磁性能为:剩磁0.52 T,内禀矫顽力5.50 kOe,最大磁能积3.38 MGOe。研究还表明,中等粒度(80~200目)的废料粉末在成型后可以得到更高的密度和磁各向异性。结果表明,直接利用烧结钕铁硼废料制备再生粘结磁体,可以作为回收钕铁硼废料的一种有效途径。The sintered Nd-Fe-B waste magnets were mechanically crushed into powders to fabricate anisotropic bonded magnets.The effects of particle size,curing time and atmosphere of regenerated powders on the properties,microstructure and anisotropy of the bonded magnets were studied.It was found that the properties of the regenerated powders largely dominate the performance of the bonded magnets.Relatively good magnetic properties can be obtained after curing at 150℃ for 1-1.5 h.Argon or vacuum protection also played an important role in improving the performance of bonded magnets.The bonded magnet with Br of 0.52 T,Hcj of 5.50 kOe and(BH)max of 3.38 MGOe was obtained using the powders with particle size of 40-80 mesh cured for 1 h under argon protection.The results also show that using the medium-sized(80-200 mesh)powders,the bonded magnets can achieve high density and good magnetic anisotropy.This work indicates that the direct use of waste sintered Nd-Fe-B magnets to prepare bonded magnets can be an efficient way to recover Nd-Fe-B wastes.

关 键 词：钕铁硼废料 再生粘结磁体 粒度 固化时间 微观组织 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]