高矫顽力混合稀土永磁体的微结构与磁性能  

Microstructure and magnetic properties of high coercivity mixed rare earth permanent magnets

作　　者：刘宇飞[1] 刘艳丽[1] 王鑫[2] 周建军 俎达 贾美爽 刘飞[1] 马强[2] LIU Yufei;LIU Yanli;WANG Xin;ZHOU Jianjun;ZU Da;JIA Meishuang;LIU Fei;MA Qiang(Inner Mongolia University of Science&Technology,Baotou 014010,Inner Mongolia,China;Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341000,Jiangxi,China)

机构地区：[1]内蒙古科技大学,内蒙古包头014010 [2]中国科学院赣江创新研究院,江西赣州341000

出　　处：《有色金属科学与工程》2023年第2期288-294,共7页Nonferrous Metals Science and Engineering

基　　金：中国科学院重点部署项目(ZDRW-CN-2021-3);中国科学院赣江创新研究院重点部署项目(E055B002);国家自然科学基金资助项目(51961031)。

摘　　要：利用高丰度混合稀土制备永磁材料不仅可以有效降低成本,同时可促进稀土资源的平衡利用。本研究采用晶界扩散工艺制备了高矫顽力混合稀土永磁体,研究了重稀土Tb对混合稀土永磁体磁性能及微结构的影响。研究发现,当晶界扩散热处理为880℃、8 h时,磁体表现出优异的磁性能,矫顽力由660.12 kA/m增长至1248.13 kA/m,并且磁体剩磁仍然保持在1.29 T。Tb元素的扩散使混合稀土扩散磁体的主相晶粒边缘形成了(Tb,RE)_(2)Fe_(14)B核壳结构,这不仅增强了主相晶粒边缘的磁晶各向异性场,而且阻断了晶粒之间的磁耦合作用,抑制了反向畴形核的长大,提高了磁体的矫顽力。The preparation of permanent magnetic materials using high-abundance mixed rare earths can not only effectively reduce the cost,but also promote the balanced utilization of rare earth resources.In this paper,high coercivity mixed rare-earth permanent magnets were prepared by grain boundary diffusion process,and the effects of heavy rare-earth Tb on the magnetic properties and microstructure of the mixed rare-earth permanent magnets were investigated.It was found that when the grain boundary diffusion heat treatment was 880°C for 8 h,the magnets exhibited excellent magnetic properties,and the coercivity increased from 660.12 kA/m to 1248.13 kA/m,and the remanent magnetization remained at 1.29 T.The diffusion of Tb elements leads to the formation of(Tb,RE)_(2)Fe_(14)B core-shell structure at the main-phase grain edges of the mixed rare-earth diffusion magnets,which not only enhances the magnetocrystalline anisotropy field at the main-phase grain edges,but also blocks the magnetic coupling between the grains,inhibits the growth of reverse domain nuclei,and improves the coercivity of the magnets.

关 键 词：混合稀土 晶界扩散 矫顽力 扩散深度 铽 磁体 

分 类 号：TF845.3[冶金工程—有色金属冶金] TG111.6[金属学及工艺—物理冶金]