多级退火对高Ce含量烧结磁体磁性能及磁硬化机制的影响  

Effect of multi-stage annealing on the magnetic properties and magnetic hardening mechanism of sintered magnets with high Ce content

作　　者：岳明[1] 岳鹏昊 张乐乐 李玉卿 刘卫强[1] YUE Ming;YUE Penghao;ZHANG Lele;LI Yuqing;LIU Weiqiang(College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100124

出　　处：《金属功能材料》2025年第1期1-8,共8页Metallic Functional Materials

基　　金：国家自然科学基金(52301228,52071004)。

摘　　要：近年来,高Ce含量的磁体成为了永磁材料的研究热点。高Ce含量的(Nd,Ce)-Fe-B磁体的晶界结构与传统的Nd-Fe-B磁体有着很大的差异,而退火是优化晶界、提升磁性能的关键。在传统的二级退火基础上,优化为三级退火,系统地研究了每一级退火对(Ce_(0.6)Nd_(0.4))_(33)Fe_(bal)Al_(1)Co_(0.5)Cu_(0.35)Ga_(0.35)B_(0.96)磁体微观结构以及磁性能的影响。结果表明:经过三级退火后,磁体矫顽力从6.55增至9.35 kOe,增幅高达42.7%;方形度从78%优化至95%。磁性能大幅提升的根本原因在于,在退火的过程中消除了异形主相晶粒,调控了晶界CeFe_(2)相以及富RE相的分布,改善了晶间相的浸润性,促使形成了连续且较厚的具有良好磁隔离效果薄层晶界。In recent years,high Ce-content magnets have become the research hotspot in permanent magnet materials.The grain boundary structure of(Nd,Ce)-Fe-B magnets with high Ce content is very different from that of traditional Nd-Fe-B magnets,and annealing is the key to optimizing the grain boundary and improving the magnetic performance.The traditional two-stage annealing process was optimized into a three-stage annealing process,and the influence of each stage of annealing on the microstructure and magnetic performance of the(Ce_(0.6)Nd_(0.4))_(33)Fe_(bal)Al_(1)Co_(0.5)Cu_(0.35)Ga_(0.35)B_(0.96)magnet was systematically studied.The results show that after the three-stage annealing,the coercivity of the magnet increased from 6.55 to 9.35 kOe with an increase of 42.7%.The squareness was repaired from 78%to 95%.The fundamental reason for the significant improvement in magnetic performance is that during the annealing process,the irregular main phase grains eliminated,the distribution of CeFe_(2) phase and the RE-rich phase was regulated,the wetting of the grain boundaries phase was improved,and a continuous and thicker layer with good magnetic isolation effect was formed.

关 键 词：(Nd Ce)-Fe-B CeFe_(2)相 富RE相 退火 矫顽力 磁性能 

分 类 号：TG156.2[金属学及工艺—热处理] TM273[金属学及工艺—金属学]