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Regulation and control of insulated layers for intergranular insulated Fe/SiO2 soft magnetic composites

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Abstract

In this work, the intergranular insulated Fe/SiO2 soft magnetic composite cores with tunable insulating layer thickness were prepared by a modified Stöber method combined with the spark plasma sintering technology. Most of the conductive Fe particles could be coated uniformly by insulated SiO2 using the modified Stöber method, and the high compact and intergranular insulated cores could be obtained quickly by the spark plasma sintering process. The intergranular insulated Fe/SiO2 composite cores exhibited much higher electrical resistivity, lower core loss, better frequency stability of permeability and large higher quality factor than that of raw Fe core without insulated SiO2. The thickness of SiO2 insulating layer, electrical and magnetic properties of intergranular insulated Fe/SiO2 composite cores could be readily controlled by adjusting the tetraethyl orthosilicate concentration. The thickness of SiO2 insulating layer and resistivity of Fe/SiO2 composite cores first increased and then dropped with increasing the tetraethyl orthosilicate concentration, while the permeability and core loss changed in the opposite direction. Fe/SiO2 composite core showed the optimal performance when the tetraethyl orthosilicate concentration was 0.135 mol l−1, which exhibited better frequency stability at high frequencies, much higher electrical resistivity, higher quality factor and lower core loss.

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Acknowledgement

This work was co-sponsored by National Natural Science Foundation of China (51674181, 51274155) and the Key Projects of Hubei Provincial Department of Education (D20151103). The authors also appreciate Professor Jun Wu for effective helps in measuring the electric and magnetic properties.

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, People’s Republic of China

    Jian Wang, Xi’an Fan, Zhaoyang Wu & Guangqiang Li

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, People’s Republic of China

    Jian Wang, Xi’an Fan, Zhaoyang Wu & Guangqiang Li

  3. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, 363 Changxing Rd., Tianhe District, Guangzhou, 510650, Guangdong, People’s Republic of China

    Jian Wang

  4. School of Metallurgical Engineering, Anhui University of Technology, Maanshan, 243002, Anhui, People’s Republic of China

    Zhaoyang Wu

  5. School of Materials and Metallurgy, Wuhan University of Science and Technology, 185#, 947 Heping Road, Qingshan District, Wuhan, 430081, People’s Republic of China

    Xi’an Fan, Zhaoyang Wu & Guangqiang Li

Authors
  1. Jian Wang
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  2. Xi’an Fan
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  3. Zhaoyang Wu
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  4. Guangqiang Li
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Correspondence to Xi’an Fan.

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Wang, J., Fan, X., Wu, Z. et al. Regulation and control of insulated layers for intergranular insulated Fe/SiO2 soft magnetic composites. J Mater Sci 52, 7091–7099 (2017). https://doi.org/10.1007/s10853-017-0941-9

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  • DOI: https://doi.org/10.1007/s10853-017-0941-9

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