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Mechanism research of z Value Affecting Magnetic Properties of Sm(CoFeCuZr)z
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1.School of Materials and Engineering,Beihang University;2.State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization;3.Baotou Research Institute of Rare Earths,Baotou

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    Abstract:

    The Sm (CoFeCuZr)z permanent magnets with different z values (z=7.5~8.5) were prepared by powder metallurgy. The properties, constituent phase, precipitated-phase content, microstructure and element distribution of the magnet were characterized by magnetic measurement system, X ray diffraction analysis, electron probe and transmission electron microscope. Magnetic properties change with z value, and the inherent mechanism is explained in this essay. The results show that the increase of z value leads to the increase in the size of cell structure and the 2:17R phase with high saturation magnetization, which finally results in the improvement of remanence Br. The precipitated Zr-riched phase increases with the z value increases, which has a weakening effect on the squareness Hk/Hcj. The z value changes the enrichment of Cu element at the edge of 2: 17R phase, which has a significant effect to the coercivity Hcj. Within the certain range (z <8.2), the higher the content of Cu at that edge, the larger the coercivity is.

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[Zhang Tianli, Wang Wenlong, Xu Cheng, Wang Hui, Zhang Wei, Zhang Zhihong, Jiang Chengbao. Mechanism research of z Value Affecting Magnetic Properties of Sm(CoFeCuZr)z[J]. Rare Metal Materials and Engineering,2019,48(5):1567~1572.]
DOI:10.12442/j. issn.1002-185X.20171059

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History
  • Received:November 23,2017
  • Revised:December 22,2017
  • Adopted:January 09,2018
  • Online: June 04,2019
  • Published: