DyH2/DyH2+Cu晶界扩散对Nd-Ce-Fe-B烧结磁体的影响
Effectof grain boundary diffusion with DyH2 and DyH2+Cu on Nd-Ce-Fe-B sintered magnets
李欣俞 1胡怀谷 2王帅 1雍辉 1胡季帆3
作者信息
- 1. 太原科技大学材料科学与工程学院,太原 030024
- 2. 郑州轻工业大学机电工程学院,郑州 450002
- 3. 太原科技大学材料科学与工程学院,太原 030024;山东大学物理学院,济南 250100
- 折叠
摘要
采用双主相烧结工艺制备了的铈占稀土总重40.6％的烧结Nd-Ce-Fe-B磁体.之后分别使用DyH2和DyH2+Cu对烧结磁体进行晶界扩散,在剩磁降低较小的代价下进一步提升了矫顽力.在相同的扩散工艺条件下,DyH2+Cu扩散对磁体矫顽力的提升效果高于DyH2扩散.和DyH2扩散磁体相比,DyH2+Cu扩散磁体中Dy原子可以扩散到磁体更深的部位,可在较深的位置还存在核壳结构,且晶界相更加连续,这与Cu原子增加晶界相的流动性相关联.通过微磁学模拟,模拟结果证实了 Dy的晶界扩散可增强磁体矫顽力.
Abstract
The sintered Nd-Ce-Fe-B magnet with cerium accounting for 40.6％of the total rare earth weight was prepared using a dual-main phase sintering process,followed by grain boundary diffusion using DyH2 and DyH2+Cu,respectively.The coercivity has been improved at a cost of slight reduction of the remanence and maxi-mum magnetic product.Under the same diffusion process conditions,the enhancement effect of DyH2+Cu dif-fusion on the coercivity of magnets is higher than that of DyH2 diffusion.In DyH2+Cu diffusion magnets,Dy atoms can diffuse to deeper parts of the magnet,and core-shell structure can exist at deeper positions.Cu aided DyH2 diffusion makes grain boundary phase be more continuous.This is related to the increased fluidity of the grain boundary phase by Cu atoms.The micromagnetic simulation results confirm that the grain boundary diffu-sion of Dy can enhance the coercivity of the magnet.
关键词
Nd-Ce-Fe-B/高铈磁体/晶界扩散/矫顽力/微磁学模拟Key words
Nd-Ce-Fe-B/high cerium magnets/grain boundary diffusion/coercivity/micromagnetic simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据