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Synthesis and Magnetic Properties of Soft Magnetic Composites Based on Silicone Resin-Coated Iron Powders

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Abstract

Iron-based soft magnetic composites with silicone resin coating have been designed to reduce the core loss and improve the magnetic properties of cores. The silicone resin serving as electrical insulating layer was modified by 3-glycidoxypropyltrimethoxy silane, and the effect of silicone resin content, coupling agent, annealing treatment, and thermal cycling on the magnetic properties of composites was investigated in the frequency range from DC to 150 kHz. The coated silicone resin insulating layer was characterized by scanning electron microscopy and energy dispersive spectroscopy. The results showed that the optimum coating content of silicone resin to attain the acceptable permeability and the minimum magnetic loss for the prepared composites is 4 wt%. The sample with silicone resin coat exhibited better DC-bias superposition characteristics compared to the uncoated sample, 6 wt% silicone resin coating sample have excellent percentage effective permeability (84.8%) under 50 Oe applied field. AC magnetic properties evaluated at 1 and 100 kHz do not vary with a 95% confidence interval with the number of thermal cycles; therefore, the properties of the silicone resin-insulating composites are stable under thermal cycling.

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Acknowledgements

This research was supported by Foundation of Henan Educational Committee (17A430008), Science and Technique Foundation of Henan Province of China (162102210215), and PhD early development program (2014BSJJ022) of Zhengzhou University of Light Industry.

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Authors and Affiliations

  1. Mechanical and Electrical Engineering Institute, Zhengzhou University of Light Industry, Zhengzhou, 450002, People’s Republic of China

    Shen Wu, Jianglei Fan, Jianxiu Liu, Hongxia Gao & Dehai Zhang

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Aizhi Sun

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  1. Shen Wu
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  2. Jianglei Fan
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  3. Jianxiu Liu
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  4. Hongxia Gao
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Correspondence to Shen Wu.

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Wu, S., Fan, J., Liu, J. et al. Synthesis and Magnetic Properties of Soft Magnetic Composites Based on Silicone Resin-Coated Iron Powders. J Supercond Nov Magn 31, 587–595 (2018). https://doi.org/10.1007/s10948-017-4256-5

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  • DOI: https://doi.org/10.1007/s10948-017-4256-5

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