Effect of Nd-Ho-Al-Ga diffusion on coercivity and thermal stability of hot-deformed PrNd-Fe-B magnets  

作　　者：Yuhang Cui Xu Tang Renjie Chen Yeyuan Du Ge Dai Yong Ouyang Yiping Huang Wenzong Yin Jinyun Ju Xianshuang Xia Aru Yan 

机构地区：[1]School of Materials Science and Chemical Engineering,Ningbo University,Ningbo,315211,China [2]CISRI&NIMTE Joint Innovation Center for Rare Earth Permanent Magnets,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China [3]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Journal of Rare Earths》2025年第3期578-583,I0006,共7页稀土学报(英文版)

基　　金：Project supported by the National Key Research and Development Program of China(2022YFB3503403);the Inner Mongolia Major Technology Project(2021ZD0035);the Ningbo Natural Science Foundation(2023J343);the Science and Technology Innovation 2025 Major Project of Ningbo(2022Z106)。

摘　　要：In this study,to enhance the coercivity and high-temperature stability of hot-deformed PrNd-Fe-B magnets,the NdHoAlGa alloy was utilized as a diffusion source and a dual-alloy diffusion process was employed to enhance the room temperature coercivity from 1.72 to 2.28 T.For the magnet doped with7 wt%Nd_(72.3)Ho_(13).8Al_(2.3)Ga_(11.7),within the temperature range from 20 to 200℃,the remanence temperature coefficient a increases from-0.16%/℃to-0.14%/℃,and the coercivity temperature coefficientβincreases from-0.49%/℃to-0.43%/℃.By controlling grain boundary(GB)phases and optimizing the main phase simultaneously,Ga was induced to motivate the formation of non-ferromagnetic GB phases,reducing the size of grains and intergranular exchange coupling.Additionally,Ho was diffused into the main phase,forming(Pr,Nd,Ho)-Fe-B phase,which enhances the magnetic crystalline anisotropy field of the main phase grains at high temperatures.

关 键 词：Rare earths (Pr ND Ho)-Fe-B Dual-alloys diffusion COERCIVITY Grain boundary phase 

分 类 号：TM273[一般工业技术—材料科学与工程]