摘要
The commercial 42 M Nd-Fe-B magnet was treated by grain boundary diffusion(GBD)with Pr_(70)Co_(30)(PC),Pr_(70)Al_(30)(PA)and Pr_(70)Co_(15)Al_(15)(PCA)alloys,respectively.The mechanism of coercivity enhancement in the GBD magnets was investigated.The coercivity was enhanced from 1.63 T to 2.15 T in the PCA GBD magnet,higher than the 1.81 T of the PC GBD magnet and the 2.01 T of the PA GBD magnet.This indicates that the joint addition of Co and Al in the diffusion source can further improve the coercivity.Microstructural investigations show that the coercivity enhancement is mainly attributed to the exchange-decoupling of the GB phases.In the PCA GBD magnet,the wider thin GB phases can be formed and the thin GB phases can still be observed at the diffusion depth of 1500μm due to the combined action of Co and Al.At the same time,the formation of the Pr-rich shell can also be observed,which is helpful for the coercivity enhancement.
作者
金磊
金哲欢
朱金豪
丁广飞
郑波
郭帅
陈仁杰
闫阿儒
刘新才
Lei Jin;Zhe-Huan Jin;Jin-Hao Zhu;Guang-Fei Ding;Bo Zheng;Shuai Guo;Ren-Jie Chen;A-Ru Yan;Xin-Cai Liu(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China;Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;University of Chinese Academy of Sciences,Beijing 100049,China)
基金
Project supported by the Key Research and Development Program of Zhejiang Province
China(Grant No.2021C01190)
the Major Project of Science and Technology Innovation 2025 in Ningbo City
China(Grant No.2018B10015)
Zhejiang Province Public Welfare Technology Application Research Project(Grant No.LGG21E010007)
the Inner Mongolia Major Technology Project
the K.C.Wong Magna Fund in Ningbo University。
