中国物理B ›› 2023, Vol. 32 ›› Issue (1): 17505-017505.doi: 10.1088/1674-1056/ac6741

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Coercivity enhancement of sintered Nd-Fe-B magnets by grain boundary diffusion with Pr80-xAlxCu20 alloys

Zhe-Huan Jin(金哲欢)1,2, Lei Jin(金磊)1,2, Guang-Fei Ding(丁广飞)2,3, Shuai Guo(郭帅)2,3,†, Bo Zheng(郑波)2, Si-Ning Fan(樊思宁)2, Zhi-Xiang Wang(王志翔)2, Xiao-Dong Fan(范晓东)2, Jin-Hao Zhu(朱金豪)2, Ren-Jie Chen(陈仁杰)2,3,4, A-Ru Yan(闫阿儒)2,3, Jing Pan(潘晶)1, and Xin-Cai Liu(刘新才)1,‡   

  1. 1 School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China;
    2 Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Ganjiang Innovation Academy, Chinese Academy of Science, Ganjiang 342799, China
  • 收稿日期:2022-01-02 修回日期:2022-03-28 接受日期:2022-04-14 出版日期:2022-12-08 发布日期:2022-12-08
  • 通讯作者: Shuai Guo, Xin-Cai Liu E-mail:gshuai@nimte.ac.cn;liuxincai@nbu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3502802), Major Science and Technology Research and Development Project of Jiangxi Province, China (Grant No. 20203ABC28W006), the Key Research and Development Program of Shandong Province, China (Grant No. 2019JZZY010321), Major Project of "Science and Technology Innovation 2025" in Ningbo City (Grant No. 2020Z046), and the K. C. Wong Magna Fund in Ningbo University.

Coercivity enhancement of sintered Nd-Fe-B magnets by grain boundary diffusion with Pr80-xAlxCu20 alloys

Zhe-Huan Jin(金哲欢)1,2, Lei Jin(金磊)1,2, Guang-Fei Ding(丁广飞)2,3, Shuai Guo(郭帅)2,3,†, Bo Zheng(郑波)2, Si-Ning Fan(樊思宁)2, Zhi-Xiang Wang(王志翔)2, Xiao-Dong Fan(范晓东)2, Jin-Hao Zhu(朱金豪)2, Ren-Jie Chen(陈仁杰)2,3,4, A-Ru Yan(闫阿儒)2,3, Jing Pan(潘晶)1, and Xin-Cai Liu(刘新才)1,‡   

  1. 1 School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China;
    2 Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    3 University of Chinese Academy of Sciences, Beijing 100049, China;
    4 Ganjiang Innovation Academy, Chinese Academy of Science, Ganjiang 342799, China
  • Received:2022-01-02 Revised:2022-03-28 Accepted:2022-04-14 Online:2022-12-08 Published:2022-12-08
  • Contact: Shuai Guo, Xin-Cai Liu E-mail:gshuai@nimte.ac.cn;liuxincai@nbu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3502802), Major Science and Technology Research and Development Project of Jiangxi Province, China (Grant No. 20203ABC28W006), the Key Research and Development Program of Shandong Province, China (Grant No. 2019JZZY010321), Major Project of "Science and Technology Innovation 2025" in Ningbo City (Grant No. 2020Z046), and the K. C. Wong Magna Fund in Ningbo University.

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摘要： A grain boundary diffusion (GBD) process with Pr80-xAlxCu20 (x = 0, 10, 15, 20) low melting point alloys was applied to commercial 42M sintered Nd-Fe-B magnets. The best coercivity enhancement of a diffused magnet was for the Pr65Al15Cu20 GBD magnet, from 16.38 kOe to 22.38 kOe. Microstructural investigations indicated that increase in the Al content in the diffusion source can form a continuous grain boundary (GB) phase, optimizing the microstructure to enhance the coercivity. The coercivity enhancement is mainly due to the formation of a continuous GB phase to separate the main phase grains. Exchange decoupling between the adjacent main phase grains is enhanced after the GBD process. Meanwhile, the introduction of Al can effectively promote the infiltration of Pr into the magnet, which increases the diffusion rate of rare-earth elements within a certain range. This work provides a feasible method to enhance coercivity and reduce the use of rare-earth resources by partial replacement of rare-earth elements with non-rare-earth elements in the diffusion source.

关键词: Nd-Fe-B, grain boundary diffusion, coercivity enhancement, grain boundary phase

Abstract: A grain boundary diffusion (GBD) process with Pr80-xAlxCu20 (x = 0, 10, 15, 20) low melting point alloys was applied to commercial 42M sintered Nd-Fe-B magnets. The best coercivity enhancement of a diffused magnet was for the Pr65Al15Cu20 GBD magnet, from 16.38 kOe to 22.38 kOe. Microstructural investigations indicated that increase in the Al content in the diffusion source can form a continuous grain boundary (GB) phase, optimizing the microstructure to enhance the coercivity. The coercivity enhancement is mainly due to the formation of a continuous GB phase to separate the main phase grains. Exchange decoupling between the adjacent main phase grains is enhanced after the GBD process. Meanwhile, the introduction of Al can effectively promote the infiltration of Pr into the magnet, which increases the diffusion rate of rare-earth elements within a certain range. This work provides a feasible method to enhance coercivity and reduce the use of rare-earth resources by partial replacement of rare-earth elements with non-rare-earth elements in the diffusion source.

Key words: Nd-Fe-B, grain boundary diffusion, coercivity enhancement, grain boundary phase

中图分类号:  (Magnetic annealing and temperature-hysteresis effects)

  • 75.60.Nt
75.50.Ww (Permanent magnets) 75.50.Vv (High coercivity materials) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)