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<p>This paper employs the citric acid-assisted in-situ oxidation method for surface modification of FeSiBNbCu nanocrystalline powders, systematically investigating the influence mechanism of different citric acid concentrations (0, 10, 30&#xa0;wt%) on the material’s high-frequency magnetic properties and microwave absorption characteristics. Results show that the FeSiBNbCu nanocrystalline alloy powder oxidized with 10&#xa0;wt% citric acid has a surface oxide layer with moderate thickness and a uniform interface, which not only effectively blocks inter-particle eddy current paths but also enhances interfacial polarization and dielectric loss capability, achieving synergistic optimization of high-frequency magnetic properties and electromagnetic dissipation characteristics. At 1000&#xa0;kHz, <i>P</i><sub><i>e</i></sub> decreased by 32.89% compared to the untreated sample, <i>P</i><sub><i>h</i></sub> decreased by 17%, and <i>P</i><sub>cv</sub> decreased by 24.33% compared to the original powder. <i>μₑ</i> remained stable at approximately 23.3. Microwave absorption performance indicates that this sample achieved a minimum reflection loss of − 38.829&#xa0;dB at a thickness of 5&#xa0;mm, with an effective absorption bandwidth of 6.96&#xa0;GHz. Mechanism analysis indicates that this study provides a feasible process route and theoretical basis for developing soft magnetic composites with both low eddy current loss and multifunctional electromagnetic properties.</p>

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Achieving low magnetic loss and reduced reflection loss in FeSiBNbCu nanocrystalline powder cores via citric acid surface oxidation

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Shaofan Ge,
  • Yujie Yang,
  • Hongyu Ding,
  • Zhihao Geng,
  • Tan Hu,
  • Ying Tang,
  • Xiyan Wang

摘要

This paper employs the citric acid-assisted in-situ oxidation method for surface modification of FeSiBNbCu nanocrystalline powders, systematically investigating the influence mechanism of different citric acid concentrations (0, 10, 30 wt%) on the material’s high-frequency magnetic properties and microwave absorption characteristics. Results show that the FeSiBNbCu nanocrystalline alloy powder oxidized with 10 wt% citric acid has a surface oxide layer with moderate thickness and a uniform interface, which not only effectively blocks inter-particle eddy current paths but also enhances interfacial polarization and dielectric loss capability, achieving synergistic optimization of high-frequency magnetic properties and electromagnetic dissipation characteristics. At 1000 kHz, Pe decreased by 32.89% compared to the untreated sample, Ph decreased by 17%, and Pcv decreased by 24.33% compared to the original powder. μₑ remained stable at approximately 23.3. Microwave absorption performance indicates that this sample achieved a minimum reflection loss of − 38.829 dB at a thickness of 5 mm, with an effective absorption bandwidth of 6.96 GHz. Mechanism analysis indicates that this study provides a feasible process route and theoretical basis for developing soft magnetic composites with both low eddy current loss and multifunctional electromagnetic properties.