高丰度稀土合金添加对纳米晶Nd-Fe-B磁体微结构及磁性能的影响
Effect of high-abundance rare earth alloy addition on the microstructure and magnetic properties of nanocrystalline Nd-Fe-B magnets
张小松 1杨利耀 1朱琪雯 1倪枫婷 1黄有林 1侯育花1
作者信息
- 1. 南昌航空大学材料科学与工程学院,江西南昌 330063
- 折叠
摘要
纳米晶Nd-Fe-B磁体因其晶粒细小而具有优异的磁性能.首先将Nd-Fe-B磁粉与高丰度稀土合金粉末混合,后通过热处理进行扩散,发现PrLaCu合金粉末可显著提高磁粉的矫顽力.以扩散磁粉为前驱体,采用放电等离子烧结(SPS)技术制备纳米晶Nd-Fe-B磁体.微结构表征显示,磁体整体呈现粗细晶区交替分布的特征.通过调控高丰度稀土合金粉末中的La/Ce含量,可以有效调控粗细晶区的晶粒尺寸及其宽度,从而实现高矫顽力纳米晶Nd-Fe-B磁体的制备.与对照磁体相比,矫顽力最大可提升36.2％,这表明该方法是一种有效提高纳米晶Nd-Fe-B磁体磁性能的策略,具有重要的实际应用价值.
Abstract
Nanocrystalline Nd-Fe-B magnets exhibit excellent magnetic properties due to their fine grain size.First-ly,Nd-Fe-B magnetic powder is mixed with high abundance rare earth alloy powder,and then diffuses through heat treatment.It is found that PrLaCu alloy powder can significantly improve the coercivity of magnetic powder.Using the diffusion magnetic powder as the precursor,nanocrystalline Nd-Fe-B magnets are prepared by spark plasma sin-tering(SPS)technique.Microstructural characterization reveals that the magnet exhibits an overall alternating dis-tribution of coarse and fine grain regions.By regulating the La/Ce content in high-abundance rare-earth alloy pow-ders,the grain size and width of coarse and fine grain regions can be effectively modified,thereby enabling the fabri-cation of high coercivity nanocrystalline Nd-Fe-B magnets.The coercivity is enhanced by up to 36.2％compared to the reference magnet.The results demonstrate that this method is an effective strategy for enhancing magnetic prop-erties of nanocrystalline Nd-Fe-B magnets,offering substantial practical application value.
关键词
纳米晶Nd-Fe-B磁体/混合稀土合金/扩散/粗晶区/细晶区Key words
nanocrystalline Nd-Fe-B magnet/mixed rare earth alloy/diffusion/coarse grain region/fine grain region引用本文复制引用
出版年
2024
NETL
NSTL
万方数据