DyH_(2)/DyH_(2)+Cu晶界扩散对Nd-Ce-Fe-B烧结磁体的影响  

Effectof grain boundary diffusion with DyH_(2)andDyH_(2)+Cu on Nd-Ce-Fe-B sintered magnets

作　　者：李欣俞 胡怀谷 王帅[1] 雍辉 胡季帆 LI Xinyu;HU Huaigu;WANG Shuai;YONG Hui;HU Jifan(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Mechanical and Electrical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China;School of Physics,Shandong University,Jinan 250100,China)

机构地区：[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]山东大学物理学院,济南250100

出　　处：《功能材料》2024年第12期12168-12174,共7页Journal of Functional Materials

基　　金：山西省科技重大专项(202101050201006);山西省重点研发计划(202202050201020)。

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DyH_(2)和DyH_(2)+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,DyH_(2)+Cu扩散对磁体矫顽力的提升效果高于DyH_(2)扩散。和DyH_(2)扩散磁体相比,DyH_(2)+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。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 DyH_(2)and DyH_(2)+Cu,respectively.The coercivity has been improved at a cost of slight reduction of the remanence and maximum magnetic product.Under the same diffusion process conditions,the enhancement effect of DyH_(2)+Cu diffusion on the coercivity of magnets is higher than that of DyH_(2)diffusion.In DyH_(2)+Cu diffusion magnets,Dy atoms can diffuse to deeper parts of the magnet,and core-shell structure can exist at deeper positions.Cu aided DyH_(2)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 diffusion 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 

分 类 号：TM271[一般工业技术—材料科学与工程]