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Influence of processed parameters on the magnetic properties of Fe/Fe3O4 composite cores

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Abstract

Fe powders coated with Fe3O4 insulating layers were synthesized by in-situ oxidization method, and then the Fe/Fe3O4 composite cores were prepared by a powder metallurgy procedure. The formation of Fe3O4 on the surface of Fe powders can effectively reduce the magnetic loss and enhance the high-frequency performance of magnetic cores. With the increase of pressing pressure, the permeability increased firstly and then decreased, while the magnetic loss shows the opposite law. The residual stress of the composites can be released more sufficient by increasing the annealing temperature, which leads to the increase in permeability; however, Fe3O4 will decompose into FeO when the annealing temperature rises to 570 °C, thus destroying the magnetic properties of Fe-based soft magnetic composites. The composite compressed at 800 MPa and annealed in argon at 500 °C for 2 h exhibits excellent magnetic performance, which presents high permeability (μ) of 56 (1 KHz), high saturation magnetization (Ms) of 219.2 emu/g, and low magnetic loss (P) of 30.5 w/kg (20 mT, 100 kHz).

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Acknowledgements

This work was financially supported by the Natural Science Foundation of Hunan Province (2019JJ40028) and the Science and Technology Project of Hunan Province (2019GK5001).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China

    Qian Zhang, Shouguo Li, Wei Zhang & Kun Peng

  2. Hunan Engineering Technology Research Center for Microwave Devices and Equipment, Hunan University, Changsha, 410082, China

    Kun Peng

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  1. Qian Zhang
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  2. Shouguo Li
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  3. Wei Zhang
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Correspondence to Kun Peng.

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Zhang, Q., Li, S., Zhang, W. et al. Influence of processed parameters on the magnetic properties of Fe/Fe3O4 composite cores. J Mater Sci: Mater Electron 32, 1233–1241 (2021). https://doi.org/10.1007/s10854-020-04896-1

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  • DOI: https://doi.org/10.1007/s10854-020-04896-1

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