中国物理B ›› 2024, Vol. 33 ›› Issue (3): 37508-037508.doi: 10.1088/1674-1056/ad0e5c
Effect of In doping on the evolution of microstructure, magnetic properties and corrosion resistance of NdFeB magnets
Yuhao Li(李豫豪)1,2, Xiaodong Fan(范晓东)2, Zhi Jia(贾智)2,3, Lu Fan(范璐)2, Guangfei Ding(丁广飞)2,3, Xincai Liu(刘新才)1,†, Shuai Guo(郭帅)2,‡, Bo Zheng(郑波)2,§, Shuai Cao(曹帅)2, Renjie Chen(陈仁杰)2,3, and Aru Yan(闫阿儒)2,3
- 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 Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
Effect of In doping on the evolution of microstructure, magnetic properties and corrosion resistance of NdFeB magnets
Yuhao Li(李豫豪)1,2, Xiaodong Fan(范晓东)2, Zhi Jia(贾智)2,3, Lu Fan(范璐)2, Guangfei Ding(丁广飞)2,3, Xincai Liu(刘新才)1,†, Shuai Guo(郭帅)2,‡, Bo Zheng(郑波)2,§, Shuai Cao(曹帅)2, Renjie Chen(陈仁杰)2,3, and Aru Yan(闫阿儒)2,3
- 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 Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
摘要： The grain boundary phase affects the magnetic properties and corrosion resistance of sintered NdFeB magnets. In this work, a small amount of In was added to NdFeB magnets by induction melting to systematically investigate its effect on the evolution of the microstructure, magnetic properties and corrosion resistance of NdFeB magnets. Microstructural analysis illustrated that minor In addition generated more grain boundary phases and an abundant amorphous phase at the triple-junction grain boundary. While the addition of In failed to enhance the magnetic isolation effect between adjacent matrix grains, its incorporation fortuitously elevated the electrochemical potential of the In-containing magnets. Besides, during corrosion, an In-rich precipitate phase formed, hindering the ingress of the corrosive medium into the magnet. Consequently, this significantly bolstered the corrosion resistance of the sintered NdFeB magnets. The phase formation, magnetic properties and corrosion resistance of In-doped NdFeB magnets are detailed in this work, which provides new prospects for the preparation of high-performance sintered NdFeB magnets.
中图分类号: (Permanent magnets)
- 75.50.Ww