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<p>A superhydrophobic self-cleaning surface coating composed of polydimethylsiloxane (PDMS), zinc oxide (ZnO), and fluorosilane is reported here for porcelain-based high-voltage electrical insulators enhancing their flashover prevention properties. The composite coating was directly applied on the porcelain surface using a simple spray technique that exhibited a water contact angle of 158° with a sliding angle less than 1°. By varying the ratios of PDMS and ZnO, the optimized coating demonstrated strong resistance to chemical degradation, good stability under UV exposure, and&#xa0;anti-biofouling properties, and it&#xa0;showed excellent resistance against degradation caused by tracking and erosion under severe conditions. The dielectric strength of the coating was measured as approximately 35.8 ± 0.6&#xa0;kV/mm following ASTM D150 and IEC 60250 standards indicating that the superhydrophobic coating, even when exposed to water, maintains its insulating properties nearly equivalent to those of a dry surface. Further, a low dielectric loss exhibited by the developed coating suggested its minimal energy dissipation, a key characteristic that makes the coating particularly suitable for high-voltage insulation applications.</p>

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PDMS-based nanocomposite superhydrophobic coating for enhanced self-cleaning and flashover prevention in high-voltage porcelain insulators

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Anan Saenkhamai,
  • Sitthisuntorn Supothina,
  • Tanujjal Bora

摘要

A superhydrophobic self-cleaning surface coating composed of polydimethylsiloxane (PDMS), zinc oxide (ZnO), and fluorosilane is reported here for porcelain-based high-voltage electrical insulators enhancing their flashover prevention properties. The composite coating was directly applied on the porcelain surface using a simple spray technique that exhibited a water contact angle of 158° with a sliding angle less than 1°. By varying the ratios of PDMS and ZnO, the optimized coating demonstrated strong resistance to chemical degradation, good stability under UV exposure, and anti-biofouling properties, and it showed excellent resistance against degradation caused by tracking and erosion under severe conditions. The dielectric strength of the coating was measured as approximately 35.8 ± 0.6 kV/mm following ASTM D150 and IEC 60250 standards indicating that the superhydrophobic coating, even when exposed to water, maintains its insulating properties nearly equivalent to those of a dry surface. Further, a low dielectric loss exhibited by the developed coating suggested its minimal energy dissipation, a key characteristic that makes the coating particularly suitable for high-voltage insulation applications.