材料科学与技术 ›› 2022, Vol. 120 ›› Issue (0): 8-14.DOI: 10.1016/j.jmst.2021.12.037

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  • 收稿日期:2021-09-23 修回日期:2021-12-07 接受日期:2021-12-14 出版日期:2022-09-01 发布日期:2022-03-06

Cellular microstructure modification and high temperature performance enhancement for Sm2Co17-based magnets with different Zr contents

Chao Wang1, Peng Shen1, Yikun Fang, Shuai Wang, Qiangfeng Li, Lei Wang, Wei Li(), Minggang Zhu()   

  1. Division of Functional Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China
  • Received:2021-09-23 Revised:2021-12-07 Accepted:2021-12-14 Online:2022-09-01 Published:2022-03-06
  • Contact: Wei Li,Minggang Zhu
  • About author:mgzhu@126.com (M. Zhu).
    * E-mail addresses: weili@cisri.com.cn (W. Li),
    First author contact:

    1 These authors contributed equally to this work.

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Abstract:

Influence of Zr contents on high-temperature magnetic performance of Sm(CobalFe0.09Cu0.09Zrx)7.2 (x = 0.025, 0.03, 0.035, 0.04) magnets were investigated. As x increases from 0.025 to 0.04, the temperature coefficient of intrinsic coercivity (Hcj) is optimized from -0.1673% K-1 to -0.1382% K-1 and the Hcj at 773 K gradually increases from 556.32 kA m-1 to 667 kA m-1. The microstructure and microchemistry of different Zr-content magnets were revealed by a transmission electron microscope equipped with EDS. The increasing Zr content induces that the average size of cells decreases from ∼ 76 nm to ∼ 56 nm and the weight fraction of 1:5H cell boundary phase increases from ∼ 25% to ∼ 37% as well, resulting decreasing of the average Cu content at cell boundaries from 13.59 at% to ∼ 8.52 at%. It is found that the Cu-lean characteristic at cell boundary phase is the reason that gives rise to higher magnetic properties at elevated temperatures for x = 0.04 magnet.

Key words: Sm2Co17-type magnets, Zr content, High temperature magnetic properties, FROC diagram