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<p>In this study, soft magnetic composites comprising ferrosilicon (FeSi) and biotite were prepared via ball milling, and their morphologic and magnetic characteristics were investigated. Scanning electron microscopy revealed that the shear and crushing forces of ball milling led to the stripping and crushing of the layered biotite into nanosheets, which uniformly adhered to the FeSi particles, forming inorganic insulating coatings. Incorporating biotite not only decreased the eddy current loss of the FeSi/biotite composite but also increased its relaxation frequency. Among the composites, FeSi/1-wt.% biotite exhibited outstanding magnetic characteristics, with respective effective permeability and magnetic loss of 68.2 and 1879&#xa0;kW/m<sup>3</sup> (measured at 0.1&#xa0;T and 100&#xa0;kHz).</p>

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FeSi/biotite soft magnetic composites with low magnetic losses and high magnetic permeabilities

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Shoujin Zhu,
  • Chengwen Zhang,
  • Weibing Wu,
  • Songlin Zhou,
  • Jiangli Ni,
  • Shuangjiu Feng,
  • Xiansong Liu,
  • Xucai Kan,
  • Dingni Shi

摘要

In this study, soft magnetic composites comprising ferrosilicon (FeSi) and biotite were prepared via ball milling, and their morphologic and magnetic characteristics were investigated. Scanning electron microscopy revealed that the shear and crushing forces of ball milling led to the stripping and crushing of the layered biotite into nanosheets, which uniformly adhered to the FeSi particles, forming inorganic insulating coatings. Incorporating biotite not only decreased the eddy current loss of the FeSi/biotite composite but also increased its relaxation frequency. Among the composites, FeSi/1-wt.% biotite exhibited outstanding magnetic characteristics, with respective effective permeability and magnetic loss of 68.2 and 1879 kW/m3 (measured at 0.1 T and 100 kHz).