中国物理B ›› 2023, Vol. 32 ›› Issue (5): 56501-056501.doi: 10.1088/1674-1056/acc933

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Thermal expansion behavior of sintered Nd-Fe-B magnets with different Co contents and orientations

Rui-Yang Meng(孟睿阳), Ji-Yuan Xu(徐吉元), Jia-Teng Zhang(张家滕), Jing Liu(刘静), Yi-Kun Fang(方以坤), Sheng-Zhi Dong(董生智)†, and Wei Li(李卫)   

  1. Division of Functional Material, Central Iron&Steel Research Institute, Beijing 100081, China
  • 收稿日期:2022-11-22 修回日期:2023-03-03 接受日期:2023-03-31 出版日期:2023-04-21 发布日期:2023-05-10
  • 通讯作者: Sheng-Zhi Dong E-mail:dong_shengzhi@163.com
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3502900) and the National Natural Science Foundation of China (Grant No. 51871063), the Key Technology Research and Development Program of Shandong Province, China (Grant No. 2019JZZY020210), and the Major Projects in Inner Mongolia Autonomous Region, China.

Thermal expansion behavior of sintered Nd-Fe-B magnets with different Co contents and orientations

Rui-Yang Meng(孟睿阳), Ji-Yuan Xu(徐吉元), Jia-Teng Zhang(张家滕), Jing Liu(刘静), Yi-Kun Fang(方以坤), Sheng-Zhi Dong(董生智)†, and Wei Li(李卫)   

  1. Division of Functional Material, Central Iron&Steel Research Institute, Beijing 100081, China
  • Received:2022-11-22 Revised:2023-03-03 Accepted:2023-03-31 Online:2023-04-21 Published:2023-05-10
  • Contact: Sheng-Zhi Dong E-mail:dong_shengzhi@163.com
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3502900) and the National Natural Science Foundation of China (Grant No. 51871063), the Key Technology Research and Development Program of Shandong Province, China (Grant No. 2019JZZY020210), and the Major Projects in Inner Mongolia Autonomous Region, China.

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摘要： The thermal expansion behavior of sintered Nd-Fe-B magnets is a crucial parameter for production and application. However, this aspect has not been thoroughly investigated. In this study, three different sintered Nd-Fe-B magnets with varying Co content (m Co=0, 6, 12 wt%) were prepared using the conventional powder metallurgy method, and four magnets oriented under different magnetic fields were prepared to compare. The thermal expansion behavior for the magnets was investigated using a linear thermal dilatometry in the temperature range of 20 ℃-500 ℃. It was found that, the coefficient of thermal expansion (CTE) increases with the increase of Co contents, while the anisotropy of thermal expansion decreases. The introduction of Co leads to continuous changes from negative to positive thermal expansion in the vertically oriented direction, which is important for the development of zero thermal expansion magnets. The thermal expansion of non-oriented magnets was found to be isotropic. Additionally, the anisotropy of thermal expansion increases with the increase of orientation degree. These results have important implications for the development of sintered Nd-Fe-B with controllable CTE.

关键词: thermal expansion, sintered Nd-Fe-B magnets, orientation, Co content

Abstract: The thermal expansion behavior of sintered Nd-Fe-B magnets is a crucial parameter for production and application. However, this aspect has not been thoroughly investigated. In this study, three different sintered Nd-Fe-B magnets with varying Co content (m Co=0, 6, 12 wt%) were prepared using the conventional powder metallurgy method, and four magnets oriented under different magnetic fields were prepared to compare. The thermal expansion behavior for the magnets was investigated using a linear thermal dilatometry in the temperature range of 20 ℃-500 ℃. It was found that, the coefficient of thermal expansion (CTE) increases with the increase of Co contents, while the anisotropy of thermal expansion decreases. The introduction of Co leads to continuous changes from negative to positive thermal expansion in the vertically oriented direction, which is important for the development of zero thermal expansion magnets. The thermal expansion of non-oriented magnets was found to be isotropic. Additionally, the anisotropy of thermal expansion increases with the increase of orientation degree. These results have important implications for the development of sintered Nd-Fe-B with controllable CTE.

Key words: thermal expansion, sintered Nd-Fe-B magnets, orientation, Co content

中图分类号:  (Thermal expansion; thermomechanical effects)

  • 65.40.De
75.50.Ww (Permanent magnets) 61.30.Gd (Orientational order of liquid crystals; electric and magnetic field effects on order) 77.80.bg (Compositional effects)