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Influence of Sintering Temperatures on the Phase Structure and Magnetic Properties of Spark Plasma Sintered SmCo5 Magnets

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Abstract

SmCo5 magnets were prepared by spark plasma sintering (SPS) technique. The phase constitutions, magnetic properties, and microstructures of magnets prepared under different sintering temperatures were investigated systematically. It is observed that the 1:5 phase and 2:7 phase coexist in the magnet, and 2:17 phase appears when the temperature rises to 1050 °C. The best magnetic properties were obtained for the magnets prepared at 1000 °C, with remanence Jr = 0.45 T, intrinsic coercivity Hcj = 985 kA/m, and maximum energy density (BH)max = 37 kJ/m3. It is shown that the SPSed magnet prepared at 1000 °C exhibits excellent thermal stability which is described in terms of temperature coefficient of remanence (α) = −0.15%/°C and temperature coefficient of coercivity (β) = −0.25%/°C in the temperature range of 27–400 °C. The microstructure analysis showed that the high density of the magnet and the uniform distribution of the hard magnetic phase are the main reasons for the excellent magnetic properties.

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Funding

This work was supported by the Key Research and Development Program of Jiangxi Province (Grant No. 20201BBE51010), China Postdoctoral Science foundation (Grant No. 2020M682064), Postdoctoral Science foundation of Jiangxi Province (Grant No. 2020KY19), the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology (No. JXUSTQJYX2020003), the Ph.D. Start-up Foundation of Jiangxi University of Science and Technology (Grant No. JXXJBS18052) and the project funded by the science and technology bureau of Ganzhou city (No. 204301000105).

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Authors and Affiliations

  1. Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices & College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, 341000, People’s Republic of China

    Youwei Chen, Qingzheng Jiang, Xiang Li, Sajjad Ur Rehman, Chuanjia Zhao, Jie Song & Zhenchen Zhong

  2. Fujian Key Laboratory for Rare Earth Functional Materials, Longyan, 366300, People’s Republic of China

    Qingzheng Jiang

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  1. Youwei Chen
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  2. Qingzheng Jiang
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Correspondence to Qingzheng Jiang or Zhenchen Zhong.

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Chen, Y., Jiang, Q., Li, X. et al. Influence of Sintering Temperatures on the Phase Structure and Magnetic Properties of Spark Plasma Sintered SmCo5 Magnets. J Supercond Nov Magn 34, 3395–3401 (2021). https://doi.org/10.1007/s10948-021-06043-1

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  • DOI: https://doi.org/10.1007/s10948-021-06043-1

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