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.
作者
刘宇飞
刘艳丽
王鑫
周建军
俎达
贾美爽
刘飞
马强
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)
出处
《有色金属科学与工程》
CAS
北大核心
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)。
关键词
混合稀土
晶界扩散
矫顽力
扩散深度
铽
磁体
misch metal
grain boundary diffusion
coercivity
diffusion depth
Tb
magnets
