烧结钕铁硼基底成分对晶界扩散效果的影响研究  

Influence of Sintered NdFeB Substrate Composition on Grain Boundary Diffusion

作　　者：陈侃 赵红良 范逢春 Chen Kan;Zhao Hongliang;Fan Fengchun(Ningbo Tongchuang Strong Magnet Material Co.,Ltd,Ningbo 315001,China)

机构地区：[1]宁波同创强磁材料有限公司,浙江宁波315001

出　　处：《稀有金属材料与工程》2024年第3期841-847,共7页Rare Metal Materials and Engineering

基　　金：宁波市科技创新2025重大专项(2020Z050)。

摘　　要：晶界扩散作为一种能明显提升烧结钕铁硼磁体矫顽力同时实现对重稀土高质化利用的方法,日益成为目前稀土永磁学界和产业界的研究热点。利用自动化喷涂设备系统研究了晶界扩散烧结磁体批量制备过程中基底成分差异对晶界扩散后磁体磁性能的影响。微观结构和EDX元素分析结果表明:晶界扩散后磁体矫顽力增长幅度的差异,同扩散后磁体内晶粒核壳结构形成充分与否、晶界相均匀分布与否和晶界相铁磁性元素含量高低有密切关联,同时利用晶界扩散工艺制备得到的磁体温度系数要优于传统工艺制备得到的相近似牌号的磁体。Grain boundary diffusion can significantly improve the coercivity of sintered NdFeB magnets and realize the high-quality utilization of heavy rare earth,and it has increasingly become a research hotspot in the field of rare earth permanent magnetism and industry.In this paper,the influence of substrate composition difference on the magnetic properties of the magnets after grain boundary diffusion during the batch preparation of the grain boundary diffusion sintered magnets was studied using the automatic spraying equipment system.The results of microstructure and EDS element analysis show that the difference in the growth range of the coercivity of the magnets after grain boundary diffusion is closely related to the adequacy of the formation of the grain core-shell structure in the magnets after diffusion,the uniform distribution of the grain boundary phase and the content of ferromagnetic elements in the grain boundary phase.At the same time,the temperature coefficient of the magnet prepared by the grain boundary diffusion process is better than that of the magnet of similar brand prepared by the traditional process.

关 键 词：烧结钕铁硼磁体 晶界扩散工艺 磁性能 

分 类 号：TM272[一般工业技术—材料科学与工程]