中国物理B ›› 2021, Vol. 30 ›› Issue (7): 77504-077504.doi: 10.1088/1674-1056/abf7a9

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Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO2

Qi-Qi Yang(杨棋棋)1,2, Zhuang Liu(刘壮)1,†, Chao-Yue Zhang(张超越)1, Hai-Chen Wu(吴海辰)1, Xiao-Lei Gao(高晓磊)1, Yi-Long Ma(马毅龙)2,‡, Ren-Jie Chen(陈仁杰)1, and A-Ru Yan(闫阿儒)1   

  1. 1 Laboratory of Rare-Earth Magnetic Functional Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    2 College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
  • 收稿日期:2021-03-16 修回日期:2021-04-09 接受日期:2021-04-14 出版日期:2021-06-22 发布日期:2021-07-02
  • 通讯作者: Zhuang Liu, Yi-Long Ma E-mail:zliu@nimte.ac.cn;yilongma@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51877094) and Ningbo Science and Technology Project (Grant No. 2014B11009).

Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO2

Qi-Qi Yang(杨棋棋)1,2, Zhuang Liu(刘壮)1,†, Chao-Yue Zhang(张超越)1, Hai-Chen Wu(吴海辰)1, Xiao-Lei Gao(高晓磊)1, Yi-Long Ma(马毅龙)2,‡, Ren-Jie Chen(陈仁杰)1, and A-Ru Yan(闫阿儒)1   

  1. 1 Laboratory of Rare-Earth Magnetic Functional Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    2 College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
  • Received:2021-03-16 Revised:2021-04-09 Accepted:2021-04-14 Online:2021-06-22 Published:2021-07-02
  • Contact: Zhuang Liu, Yi-Long Ma E-mail:zliu@nimte.ac.cn;yilongma@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51877094) and Ningbo Science and Technology Project (Grant No. 2014B11009).

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摘要： In order to counteract the demagnetization caused by eddy current loss, widespread attention has been devoted to increasing the resistivity of permanent magnets. We prepared 2:17-type SmCo magnets doped with different ZrO2 contents and investigated the influence of the ZrO2 content on the magnetic properties and resistive anisotropism. The results showed that not only was the resistivity of the magnet improved, but, in addition, the coercivity of the magnet was significantly increased. The microstructure was studied with TEM, which showed that ZrO2 doping was able to cause a decrease in the lamellar phase density and the growth of cellular structures. The increased grain boundaries and Sm2O3 phases were favorable to the improvement of resistivity. The decrease of the lamellar phases caused a narrowing of the resistive anisotropism. The additional Cu in the center of the cellular boundaries was the main reason for the enhancement of Hcj. However, an excessive amount caused an increase of the Zr6(FeCo)23 phase and a deterioration of the cellular structure, thereby leading to a decrease in coercivity.

关键词: 2:17-type SmCo magnets, resistivity, coercivity, cellular structure

Abstract: In order to counteract the demagnetization caused by eddy current loss, widespread attention has been devoted to increasing the resistivity of permanent magnets. We prepared 2:17-type SmCo magnets doped with different ZrO2 contents and investigated the influence of the ZrO2 content on the magnetic properties and resistive anisotropism. The results showed that not only was the resistivity of the magnet improved, but, in addition, the coercivity of the magnet was significantly increased. The microstructure was studied with TEM, which showed that ZrO2 doping was able to cause a decrease in the lamellar phase density and the growth of cellular structures. The increased grain boundaries and Sm2O3 phases were favorable to the improvement of resistivity. The decrease of the lamellar phases caused a narrowing of the resistive anisotropism. The additional Cu in the center of the cellular boundaries was the main reason for the enhancement of Hcj. However, an excessive amount caused an increase of the Zr6(FeCo)23 phase and a deterioration of the cellular structure, thereby leading to a decrease in coercivity.

Key words: 2:17-type SmCo magnets, resistivity, coercivity, cellular structure

中图分类号:  (Permanent magnets)

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