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

作　　者：张小松 杨利耀 朱琪雯 倪枫婷 黄有林[1] 侯育花[1] ZHANG Xiaosong;YANG Liyao;ZHU Qiwen;NI Fengting;HUANG Youlin;HOU Yuhua(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《金属功能材料》2024年第6期117-123,共7页Metallic Functional Materials

基　　金：江西省研究生创新专项资金(YC2022-S705)。

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。Nanocrystalline Nd-Fe-B magnets exhibit excellent magnetic properties due to their fine grain size.Firstly,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 sintering(SPS)technique.Microstructural characterization reveals that the magnet exhibits an overall alternating distribution of coarse and fine grain regions.By regulating the La/Ce content in high-abundance rare-earth alloy powders,the grain size and width of coarse and fine grain regions can be effectively modified,thereby enabling the fabrication 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 properties 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 

分 类 号：TM2[一般工业技术—材料科学与工程]