晶界相和主相微观结构对多主相(Nd,Ce)-Fe-B磁体磁性能的影响  

Effect of Grain Boundary Phase and Main Phase Microstructure on Magnetic Properties of Multi-Main-Phase (Nd,Ce)-Fe-B Magnets

作　　者：崔熙贵[1] 梁文接 程玲玲 张红劲 舒刚易 CUI Xigui;LIANG Wenjie;CHENG Lingling;ZHANG Hongjin;SHU Gangyi(School of Mechanical Engineering,Jiangsu University,Zhenjiang 212000,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212000

出　　处：《热加工工艺》2024年第18期142-147,154,共7页Hot Working Technology

基　　金：江苏省自然科学基金项目(BK20191432);镇江市重点研发计划项目(GY2020012);江苏大学第二十一批大学生科研立项项目(21A162);江苏大学工业中心大学生创新实践基金项目(ZXJG2021025)。

摘　　要：采用微磁学方法研究了多主相(Nd,Ce)-Fe-B磁体的晶界相结构、主相晶粒尺度、主相成分等因素对磁体磁性能的影响。研究结果表明:晶界相为非磁性时,沿晶界分布的晶界相厚度越大,对磁体的矫顽力H_(cj)改善越有利;随着晶界相磁性的提高,磁体矫顽力H_(cj)明显降低。同时,主相晶粒细化也有助于改善磁体矫顽力H_(cj),随着晶粒尺度减小,磁体的矫顽力H_(cj)逐渐增大;经Pr、Dy扩散后在主相晶粒表面形成的((Nd,Ce)_(1-x)RE_(x))_(2)Fe_(14)B(RE=Pr/Dy)硬磁壳层,使形核场提高,矫顽力H_(cj)得到显著改善。A micromagnetic method was used to investigate the effect of grain boundary phase structure,grain size of the main phase,and main phase composition on the magnetic properties of multi-main-phase(Nd,Ce)-Fe-B magnets.The results demonstrate that when the grain boundary phase is nonmagnetic,the grain boundary phase along the grain boundary is thicker,which is more favorable to the improvement of the coercivity H_(cj).With the magnetism of grain boundary phase increasing,the coercivity H_(cj) of the magnet reduces dramatically.Meanwhile,the refinement of main phase grain helps enhance the magnet coercivity H_(cj).As the grain size decreases,the coercivity H_(cj) of the magnet gradually increases.Moreover,after diffusion of Pr and Dy,a hard magnetic shell layer of((Nd,Ce)_(1-x)RE_(x))_(2)Fe_(14)B(RE=Pr/Dy)is formed on the surface of the main phase grains,resulting in an increased nucleation field and thus a significant improvement in the coercivity H_(cj).

关 键 词：多主相(Nd Ce)-Fe-B磁体 微磁学模拟 微观结构 磁性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]