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Soft magnetic properties of nano-SiO2 coated FeNi alloy powder at high frequencies

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Abstract

Soft magnetic composites serve in electrical applications and sustainable energy supply, the magnetic flux changes in response to changes of the applied magnetic field, with energy loss. To reduce the loss, in this paper, the soft magnetic composite Fe50Ni50 powder coated with nano-SiO2 was prepared by tetraethoxysilane sol–gel method, and the microstructure of the coating was characterized. Then, soft magnetic Fe50Ni50 powder cores have been prepared, and annealed with different atmospheres. The power loss is lower when the magnetic cores were annealed in a reducing hydrogen atmosphere. The lowest power loss (1390.7 mW/cm3, f = 1000 kHz, B = 50 mT, 120 °C) was obtained when the cores annealed at 730 °C in H2 atmosphere. The results show that the eddy current loss is significantly reduced by coating SiO2, and the power loss is reduced about 33% in high-frequency (1 MHz and 50 mT, 25 °C). From 25 to 120 °C, the power loss at 1 MHz decreases by about 33% due to the reduction of hysteresis loss and eddy current loss. The excellent properties are very applicable for the inductors of 5G technology.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 51872004), the National Key R&D Program of China (Grant No. 2021YFB3502400), the Education Department of Anhui Province (No. KJ2018A0039) and the Key Research and Development Plan of Anhui Province (Nos. 201904a05020038, 202003a05020051).

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Authors and Affiliations

  1. Engineering Technology Research Center of Magnetic Materials of Anhui Province, School of Materials Science and Engineering, Anhui University, Hefei, 230601, China

    Cong Zhang, Xiansong Liu, Xucai Kan, Shuangjiu Feng, Yong Zhu, Yujie Yang & Zongyang Zhang

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  1. Cong Zhang
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  2. Xiansong Liu
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  3. Xucai Kan
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  4. Shuangjiu Feng
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  5. Yong Zhu
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by CZ, XL, XK, SF, YL, YY, and ZZh. The first draft of the manuscript was written by CZ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xiansong Liu or Xucai Kan.

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Zhang, C., Liu, X., Kan, X. et al. Soft magnetic properties of nano-SiO2 coated FeNi alloy powder at high frequencies. J Mater Sci: Mater Electron 33, 25383–25391 (2022). https://doi.org/10.1007/s10854-022-09244-z

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