摘要
晶界扩散是通过热处理使扩散源沿晶界进入钕铁硼磁体内部以提高矫顽力的技术。该技术具有工艺简单、成本低廉、重稀土使用量少、能保持磁体的剩磁和磁能积基本不变,在制备小尺寸高矫顽力磁体时具有成本优势。对国内外研究成果进行了归纳总结,介绍了矫顽力提高原理及各向异性扩散机制,详细讨论了涂覆方法以及扩散源对磁体矫顽力提高的影响,并对晶界扩散的发展趋势进行了展望。
Grain boundary diffusion is a technique in which diffusion source enters NdFeB magnets along the grain boundaries by heat treatment to improve the coercivity. The technical process is simple,low cost and the usage amount of heavy rare earth is small. In addition,the remanence and the maximum magnetic energy product of the magnet can be kept basically unchanged. As a result,grain boundary diffusion has a cost advantage for manufacturing small-sized high coercivity magnets. The research results were summarized. The principle of coercivity enhancement and anisotropic diffusion mechanism were introduced. The influence of coating method and diffusion source on magnet coercivity enhancement was discussed in detail. The development trend of grain boundary diffusion was also prospected.
作者
谭敏
赵扬
陈红升
席龙龙
李安华
冯海波
TAN Min;ZHAO Yang;CHEN Hong-sheng;XI Long-long;LI An-hua;FENG Hai-bo(Divisi on of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China)
出处
《粉末冶金工业》
CAS
北大核心
2019年第2期66-72,共7页
Powder Metallurgy Industry
基金
国家自然科学基金重大项目(51590882)
材料基因组项目(2016YFB0700903)
关键词
晶界扩散
矫顽力
涂覆方法
扩散源
grain boundary diffusion
coercivity
coating method
diffusion source
