铌、钛取代对高镓低硼烧结Nd-Fe-B磁体磁性能、微结构和力学性能的影响  

Effect of Niobium and Titanium Substitution on Magnetic Properties, Microstructure and Mechanical Properties of B-Lean Ga-doped Sintered Nd-Fe-B Magnets

作　　者：杨天元 刘卫强[1] 陈昊[1] 郭子振 岳明[1] 秦渊 Yang Tianyuan;Liu Weiqiang;Chen Hao;Guo Zizhen;Yue Ming;Qin Yuan(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124

出　　处：《中国稀土学报》2023年第3期597-602,I0005,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51971005,52071004,52171168)资助。

摘　　要：高Ga低B烧结钕铁硼磁体可以在具有较高矫顽力的基础上减少重稀土的使用,因此具有重要的研究价值。本文制备了含0.2%(质量分数)Nb的高性能48H高Ga低B烧结钕铁硼磁体,与0.2%Ti掺杂磁体进行了系统的对比,分析了Nb与Ti元素掺杂对高Ga低B磁体的磁性能、微观结构、元素分布以及耐磨性能的影响与差异。与Ti取代磁体相比,Nb取代磁体的晶界相更连续、更厚同时磁隔绝效果更好,因此具有更高的矫顽力。此外Nb更容易富集在三角晶界处,抗断裂性相对较差,更容易磨损,因此具有更好的加工性能。这为优化高Ga低B磁体的显微结构制备高性能的烧结磁体提供了有意义的指导。B-lean Ga-doped sintered NdFeB magnets can reduce the use of heavy rare earth based on high coercivity, so they have significant research value. In this paper, high-performance 48H B-lean Ga-doped sintered NdFeB magnets containing 0.2% Ti and Nb were prepared, respectively. The effects of Ti and Nb element substitution on magnetic properties, microstructure, element distribution, and abrasion resistance of both magnets were analyzed. Compared with Ti substituted magnets, Nb substituted magnets have more continuous and thicker grain boundary. Therefore, a better magnetic isolation effect is obtained and the magnet has a higher coercivity. In addition, Nb substituted magnets have relatively poor fracture resistance, areeasy to wear, therefore exhibit better machinability because Nb is more likely to be enriched at the triangular grain boundaries. This provides meaningful guidance for optimizing the microstructure to prepare high-performance B-lean Ga-doped sintered magnets.

关 键 词：ND-FE-B 高Ga低B磁体 Ti NB 加工性能 

分 类 号：TM273[一般工业技术—材料科学与工程]