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Effect of Size and Content of SiO2 Nanoparticle on Corona Resistance of Silicon–Boron Composite Oxide/SiO2/Epoxy Composite

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Abstract

Corona discharge always threatens the safe and long-term operation of electrical equipment. Therefore, it is imperative to improve the corona resistance of electrical insulation materials. In this research work, fumed silica (SiO2) with different particle sizes and self-made organic silicon–boron composite oxide (Si–B) are used to modify epoxy resin (EP) for enhancing the corona resistance. Si–B/SiO2/EP nanocomposites with different SiO2 content series and 4 kinds of SiO2 particle size series are prepared by grinding machine dispersing and thermal curing. A strong dependence of the corona resistance on SiO2 filler size in nano-scale and content is revealed experimentally. The filler combination of Si–B and nano-SiO2 can reduce the relative permittivity of the Si–B/SiO2/EP nanocomposites and inhibit the increase of dielectric loss. With the particle size of SiO2 filler increases, the space charge suppression effect and the thermal stability are reduced, but corona resistance life is improved.When the 15-nm SiO2 content is 15 wt%, the corona resistance life of the Si–B/SiO2/EP nanocomposites can reach 8.99 h under 90 °C and 80 kV/mm electric field strength, while pure epoxy is only 0.86 h. The degradation path through the material is the more important factor affecting corona resistance performance–large particle size and well dispersion state can effectively extend the degradation path through the material.

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Acknowledgements

This work was financially supported by the Fundamental Research Foundation for Universities of Heilongjiang Province (LGYC2018JC033), the National Natural Science Foundation of China (No. 51277044) and the National Natural Science Foundation of China (51603057)

Funding

Fundamental Research Fundation for Universities of Heilongjiang Province (LGYC2018JC033) and the National Natural Science Foundation of China (51603057).

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Authors and Affiliations

  1. College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, 150040, People’s Republic of China

    Wei Zhao, Hao Chen, Yong Fan & Weiwei Cui

  2. Key Laboratory of Engineering Dielectric and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, People’s Republic of China

    Yong Fan

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  1. Wei Zhao
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Correspondence to Hao Chen.

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Zhao, W., Chen, H., Fan, Y. et al. Effect of Size and Content of SiO2 Nanoparticle on Corona Resistance of Silicon–Boron Composite Oxide/SiO2/Epoxy Composite. J Inorg Organomet Polym 30, 4753–4763 (2020). https://doi.org/10.1007/s10904-020-01733-0

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