有色金属科学与工程2026，Vol.17Issue(4)：487-494,8.DOI:10.13264/j.cnki.ysjskx.2026.04.001
晶界扩散低重稀土合金Pr-(Dy/Y)-Al对烧结Nd-Fe-B磁性能与微观结构的影响
Effect of low heavy rare earth alloy Pr-(Dy,Y)-Al on magnetic properties and microstructure of sintered Nd-Fe-B via grain boundary diffusion
摘要
Abstract
In order to reduce the cost of diffusion sources,the effects of three low-cost diffusion sources,Pr70Dy10Al20,Pr70Y10Al20 and Pr60Dy10Y10Al20 on the magnetic properties and microstructure of sintered Nd-Fe-B magnets were investigated using grain boundary diffusion technology.After diffusion,the coercivity of the three magnets increased from 858 kA/m to 1 746 kA/m,1 118 kA/m and 1 572 kA/m,respectively.The Pr70Dy10Al20 magnet exhibited the largest coercivity enhancement,reaching 203%of the original magnet.This was primarily attributed to the formation of a Dy-rich shell and a continuous rare-earth-rich grain boundary phase.In the Pr70Y10Al20 diffused magnet,Y-rich shells with darker atomic number contrast were formed,and the diffusion depth of Y was similar to that of Dy in the Pr70Dy10Al20 diffused magnet.Although the coercivity increase in the Pr60Dy10Y10Al20 diffused magnet was lower than that in the Pr70Dy10Al20 diffused magnet,it still showed a significant improvement compared to the Pr70Y10Al20 diffused magnet.Microstructural analysis revealed that in the Pr60Dy10Y10Al20 diffused magnet,Pr,Dy,and Y tended to enter the main phase,forming thicker Pr-Y-Dy-rich shells,which reduced the anisotropy of the shells and limited the improvement of coercivity.关键词
烧结Nd-Fe-B磁体/晶界扩散/磁性能/微观结构Key words
sintered Nd-Fe-B magnets/grain boundary diffusion/magnetic properties/microstructure分类
信息技术与安全科学引用本文复制引用
孙晟谕,万世云,翁前军,游家兴,李家节..晶界扩散低重稀土合金Pr-(Dy/Y)-Al对烧结Nd-Fe-B磁性能与微观结构的影响[J].有色金属科学与工程,2026,17(4):487-494,8.基金项目
国家自然科学基金资助项目(52261034),国家重点研发计划项目(2022YFB3505400),江西省自然科学基金面上项目(20224BAB204015),工业和信息化部149重点资助项目(TC220H06J),金属磁性材料及器件江西省重点实验室资助项目(2024SSY05061) （52261034）
