中国物理B ›› 2016, Vol. 25 ›› Issue (7): 77502-077502.doi: 10.1088/1674-1056/25/7/077502

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

Effects of terbium sulfide addition on magnetic properties, microstructure and thermal stability of sintered Nd—Fe—B magnets

Xiang-Bin Li(李向斌), Shuo Liu(刘硕), Xue-Jing Cao(曹学静), Bei-Bei Zhou(周贝贝), Ling Chen(陈岭), A-Ru Yan(闫阿儒), Gao-Lin Yan(严高林)   

  1. 1 School of Physics and Technology, Wuhan University, Wuhan 430072, China;
    2 Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • 收稿日期:2016-01-02 修回日期:2016-03-14 出版日期:2016-07-05 发布日期:2016-07-05
  • 通讯作者: Gao-Lin Yan E-mail:gaolinyan@whu.edu.cn
  • 基金资助:
    Project supported by the Science Funds from the Ministry of Science and Technology, China (Grant Nos. 2014DFB50130 and 2011CB612304) and the National Natural Science Foundation of China (Grant Nos. 51172168 and 51072139).

Effects of terbium sulfide addition on magnetic properties, microstructure and thermal stability of sintered Nd—Fe—B magnets

Xiang-Bin Li(李向斌)1, Shuo Liu(刘硕)1, Xue-Jing Cao(曹学静)1,2, Bei-Bei Zhou(周贝贝)1, Ling Chen(陈岭)2, A-Ru Yan(闫阿儒)2, Gao-Lin Yan(严高林)1   

  1. 1 School of Physics and Technology, Wuhan University, Wuhan 430072, China;
    2 Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • Received:2016-01-02 Revised:2016-03-14 Online:2016-07-05 Published:2016-07-05
  • Contact: Gao-Lin Yan E-mail:gaolinyan@whu.edu.cn
  • Supported by:
    Project supported by the Science Funds from the Ministry of Science and Technology, China (Grant Nos. 2014DFB50130 and 2011CB612304) and the National Natural Science Foundation of China (Grant Nos. 51172168 and 51072139).

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摘要： To increase coercivity and thermal stability of sintered Nd-Fe-B magnets for high-temperature applications, a novel terbium sulfide powder is added into (Pr0.25Nd0.75)30.6Cu0.15FebalB1 (wt.%) basic magnets. The effects of the addition of terbium sulfide on magnetic properties, microstructure, and thermal stability of sintered Nd-Fe-B magnets are investigated. The experimental results show that by adding 3 wt.% Tb2S3, the coercivity of the magnet is remarkably increased by about 54% without a considerable reduction in remanence and maximum energy product. By means of the electron probe microanalyzer (EPMA) technology, it is observed that Tb is mainly present in the outer region of 2:14:1 matrix grains and forms a well-developed Tb-shell phase, resulting in enhancement of HA, which accounts for the coercivity enhancement. Moreover, compared with Tb2S3-free magnets, the reversible temperature coefficients of remanence (α) and coercivity (β) and the irreversible flux loss of magnetic flow (hirr) values of Tb2S3-added magnets are improved, indicating that the thermal stability of the magnets is also effectively improved.

关键词: terbium sulfide, magnetic property, microstructure, thermal stability

Abstract: To increase coercivity and thermal stability of sintered Nd-Fe-B magnets for high-temperature applications, a novel terbium sulfide powder is added into (Pr0.25Nd0.75)30.6Cu0.15FebalB1 (wt.%) basic magnets. The effects of the addition of terbium sulfide on magnetic properties, microstructure, and thermal stability of sintered Nd-Fe-B magnets are investigated. The experimental results show that by adding 3 wt.% Tb2S3, the coercivity of the magnet is remarkably increased by about 54% without a considerable reduction in remanence and maximum energy product. By means of the electron probe microanalyzer (EPMA) technology, it is observed that Tb is mainly present in the outer region of 2:14:1 matrix grains and forms a well-developed Tb-shell phase, resulting in enhancement of HA, which accounts for the coercivity enhancement. Moreover, compared with Tb2S3-free magnets, the reversible temperature coefficients of remanence (α) and coercivity (β) and the irreversible flux loss of magnetic flow (hirr) values of Tb2S3-added magnets are improved, indicating that the thermal stability of the magnets is also effectively improved.

Key words: terbium sulfide, magnetic property, microstructure, thermal stability

中图分类号:  (Permanent magnets)

  • 75.50.Ww
75.50.Vv (High coercivity materials) 71.20.Eh (Rare earth metals and alloys)