中国物理B ›› 2020, Vol. 29 ›› Issue (5): 57501-057501.doi: 10.1088/1674-1056/ab7b57

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effect of annealing temperature on coercivity of Nd-Fe-B magnets with TbFeAl doping by process of hot-pressing

Ze-Teng Shu(舒泽腾), Bo Zheng(郑波), Guang-Fei Ding(丁广飞), Shi-Cong Liao(廖是聪), Jing-Hui Di(邸敬慧), Shuai Guo(郭帅), Ren-Jie Chen(陈仁杰), A-Ru Yan(闫阿儒), Lei Shi(石磊)   

  1. 1 Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China;
    2 Chinese Academy of Sciences Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • 收稿日期:2020-01-09 修回日期:2020-01-26 出版日期:2020-05-05 发布日期:2020-05-05
  • 通讯作者: Bo Zheng, Shuai Guo E-mail:zhengbo@nimte.ac.cn;gshuai@nimte.ac.cn
  • 基金资助:
    Project supported by the Major Project of “Science and Technology Innovation 2025” in Ningbo City, China (Grant Nos. 2018B10086 and 2018B10017).

Effect of annealing temperature on coercivity of Nd-Fe-B magnets with TbFeAl doping by process of hot-pressing

Ze-Teng Shu(舒泽腾)1,2, Bo Zheng(郑波)2, Guang-Fei Ding(丁广飞)2, Shi-Cong Liao(廖是聪)2, Jing-Hui Di(邸敬慧)2, Shuai Guo(郭帅)2, Ren-Jie Chen(陈仁杰)2, A-Ru Yan(闫阿儒)2, Lei Shi(石磊)1   

  1. 1 Nano Science and Technology Institute, University of Science and Technology of China, Suzhou 215123, China;
    2 Chinese Academy of Sciences Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • Received:2020-01-09 Revised:2020-01-26 Online:2020-05-05 Published:2020-05-05
  • Contact: Bo Zheng, Shuai Guo E-mail:zhengbo@nimte.ac.cn;gshuai@nimte.ac.cn
  • Supported by:
    Project supported by the Major Project of “Science and Technology Innovation 2025” in Ningbo City, China (Grant Nos. 2018B10086 and 2018B10017).

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摘要： The Nd-Fe-B magnets are pre-sintered and then processed with hot-pressing, and the resulting magnets are called the hot-pressed pretreated (HPP) magnets. The coercivity of the HPP magnets increases as the annealed temperature increases. When the annealing temperature is 900℃, the coercivity of the magnet is only 17.6 kOe (1 Oe=79.5775 A·m-1), but when the annealing temperature rises up to 1060℃, the coercivity of the magnet reaches 23.53 kOe, which is remarkably increased by 33.7%. The microstructure analysis indicates that the grain surface of the HPP magnet becomes smoother as the annealed temperature increases. The microstructure factor α is changed according to the intrinsic coercivity model formula. The α of the magnet at 900℃ is only 0.578, but it is 0.825 at 1060℃. Microstructural optimization is due mainly to the increase of coercivity of the HPP magnet.

关键词: hot-pressed, coercivity, microstructure, anisotropy field

Abstract: The Nd-Fe-B magnets are pre-sintered and then processed with hot-pressing, and the resulting magnets are called the hot-pressed pretreated (HPP) magnets. The coercivity of the HPP magnets increases as the annealed temperature increases. When the annealing temperature is 900℃, the coercivity of the magnet is only 17.6 kOe (1 Oe=79.5775 A·m-1), but when the annealing temperature rises up to 1060℃, the coercivity of the magnet reaches 23.53 kOe, which is remarkably increased by 33.7%. The microstructure analysis indicates that the grain surface of the HPP magnet becomes smoother as the annealed temperature increases. The microstructure factor α is changed according to the intrinsic coercivity model formula. The α of the magnet at 900℃ is only 0.578, but it is 0.825 at 1060℃. Microstructural optimization is due mainly to the increase of coercivity of the HPP magnet.

Key words: hot-pressed, coercivity, microstructure, anisotropy field

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)