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Thin superhydrophobic layers on the SiC powder surface toward electrical erosion resistance

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Abstract

The electrical erosion is a common problem in fields, such as motor insulation and gas-insulated substations. Electrical erosion resistance can be improved by enhanced nonlinear electrical conductivity or thermal conductivity. However, a problem yet to be overcome is the electrical erosion of polymeric structures under harsh environments with high humidity. This paper reports a novel electrical erosion resistance strategy by thin superhydrophobic layers on the SiC powder surface, with a static contact angle of 164° ± 2° and a slip angle of 7° ± 1°. The coating demonstrates excellent thermal conductivity of 1.62 W/(m·K) and nonlinear conductivity with aids of SiC fillers. The electrical erosion resistance of the coating was studied based on the DC inclined plane test and the arc ablation method. The results show that the electrical erosion resistance voltage of the coating reaches up to 4.5 kV. The presence of superhydrophobicity makes it difficult for the contaminant to form discharge channels on the coating surface. The nonlinear electrical conductivity of the surface-modified SiC particles can uniform the electric field distribution and inhibit the occurrence of arc discharge on the coating surface. Besides, the high thermal conductivity of superhydrophobic coatings inhibits the heat accumulation caused by arc ablation on the surface, which greatly improves the electrical erosion resistance of the coating. The research in this paper has promising potential for the safe operation of insulated equipments.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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  1. Fanyun Su and Jun** Lin have contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China

    Fanyun Su, Jun** Lin, Zhengyong Huang, Wenjie Xu & Yunfeng Long

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Contributions

FYS and JPL contributed equally to this work. FYS and JPL designed the experiments and wrote the manuscripts. ZYH guided the experiments and performed manuscript writing. WJX and YFL worked to conduct experiments and analyzed data, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Zhengyong Huang.

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Su, F., Lin, J., Huang, Z. et al. Thin superhydrophobic layers on the SiC powder surface toward electrical erosion resistance. J Mater Sci: Mater Electron 34, 401 (2023). https://doi.org/10.1007/s10854-023-09833-6

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