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<p>In this study, an in situ oxidation method was employed to surface-treat FeSiBNbCu nanocrystalline powders, aiming to create a uniform core–shell structure of Fe<sub>3</sub>O<sub>4</sub>@epoxy resin coating. This approach enabled the successful fabrication of FeSiBNbCu nanocrystalline soft magnetic powder cores (NSMCs) with outstanding comprehensive performance. The Fe<sub>3</sub>O<sub>4</sub> coating formed on the magnetic powder surface can effectively reduce the magnetic core loss and improve the high-frequency soft magnetic properties. Meanwhile, the growth mechanism and phase composition of the Fe<sub>3</sub>O<sub>4</sub> insulating layer were investigated using XPS, FTIR, XRD, and SEM–EDS. The influence of oxidation temperature on the properties of FeSiBNbCu@Fe<sub>3</sub>O<sub>4</sub> NSMCs was systematically examined. Following in situ oxidation reaction at 120&#xa0;°C for 2&#xa0;h, a thin and dense Fe<sub>3</sub>O<sub>4</sub> coating was formed on the surface of the FeSiBNbCu nanocrystalline powders. The resulting NSMCs exhibit a stable effective permeability of 18.0 between 10&#xa0;kHz and 10&#xa0;MHz. The core loss (<i>P</i><sub>cv</sub>) is 2877.1 mW/cm<sup>3</sup> at 1MHz and 50 mT, which is approximately 14.7% reduction compared to the uncoated Fe<sub>3</sub>O<sub>4</sub> coating sample. Furthermore, the cores demonstrate an outstanding DC bias characteristic of 83.7% under an applied bias field of 100 Oe.</p>

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In situ oxidation synthesis and properties of FeSiBNbCu@Fe3O4 core–shell nanocrystalline soft magnetic composites

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Ling Zhang,
  • Yaqiang Dong,
  • Yuhang Jiang,
  • Xingjie Jia,
  • Aina He,
  • Jiawei Li,
  • Qikui Man,
  • Baogen Shen

摘要

In this study, an in situ oxidation method was employed to surface-treat FeSiBNbCu nanocrystalline powders, aiming to create a uniform core–shell structure of Fe3O4@epoxy resin coating. This approach enabled the successful fabrication of FeSiBNbCu nanocrystalline soft magnetic powder cores (NSMCs) with outstanding comprehensive performance. The Fe3O4 coating formed on the magnetic powder surface can effectively reduce the magnetic core loss and improve the high-frequency soft magnetic properties. Meanwhile, the growth mechanism and phase composition of the Fe3O4 insulating layer were investigated using XPS, FTIR, XRD, and SEM–EDS. The influence of oxidation temperature on the properties of FeSiBNbCu@Fe3O4 NSMCs was systematically examined. Following in situ oxidation reaction at 120 °C for 2 h, a thin and dense Fe3O4 coating was formed on the surface of the FeSiBNbCu nanocrystalline powders. The resulting NSMCs exhibit a stable effective permeability of 18.0 between 10 kHz and 10 MHz. The core loss (Pcv) is 2877.1 mW/cm3 at 1MHz and 50 mT, which is approximately 14.7% reduction compared to the uncoated Fe3O4 coating sample. Furthermore, the cores demonstrate an outstanding DC bias characteristic of 83.7% under an applied bias field of 100 Oe.