Design and preparation of a sintered Nd-Y-Fe-B magnet with high magnetic properties via multi-main-phase process and subsequent grain boundary diffusion  

作　　者：Fugang Chen Suxin Lu Jie Wang Yong Zhao Wenqiang Zhao Zhi Xu 

机构地区：[1]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang,212100,China [2]Baotou Tianshi Rare Earth New Materials Co.,Ltd.,Baotou,014030,China [3]Jiangsu Yangzi Xinfu Shipbuilding Co.,Ltd.,Taixing,225453,China

出　　处：《Journal of Rare Earths》2025年第2期304-311,I0003,共9页稀土学报(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(51901087);China Postdoctoral Science Foundation(2021M701504)。

摘　　要：A sintered Nd-Y-Fe-B magnet was designed and manufactured by the multi-main-phase process.Unevenly distributed Y in the magnet decreases the adverse magnetic weakening effect of Y on the coercivity.Grain boundary diffusion process(GBDP)was conducted to further enhance the coercivity of the Nd-Y-Fe-B magnet.The coercivity increases significantly from 884 to 1741 kA/m after GBDP with Pr_(60)Tb_(10)Cu_(30)alloy.The mechanism of the coercivity enhancement is discussed based on the microstructure analysis.Micromagnetic simulation reveals that when the diffused Tb-rich shell thickness is lower than 12 nm the c-plane shell(perpendicular to the c-axis)is much more effective in enhancing the coercivity than the side plane shell(parallel to the c-axis).But when the Tb-rich shell thickness is above12 nm the side plane shell contributes more to the coercivity enhancement.The results in this work can help to design and manufacture Nd-Fe-B magnets with low cost and high magnetic properties.

关 键 词：Rare earths Nd-Fe-B magnets Multi-main-phase process Grain boundary diffusion Micromagnetic simulation 

分 类 号：TM2[一般工业技术—材料科学与工程]