Abstract
In cold climate conditions, insulators are subjected to ice accretion that could affect their electrical performance and consequently lead to power outages. Besides icing, other outdoor factors, such as UV, rain, and pollution, could influence their electrical insulation efficiency. Slippery liquid-infused coatings have attracted great attention due to their icephobic applications. However, the problems caused by lubricant depletion could restrict their service time and thus limit their applications. Here, lubricant-loaded carrier (LLC) powders were first obtained by applying negative pressure through a three-step procedure. Then, hydroxyl-terminated silicone oil carriers were impregnated into a blend of polydimethylsiloxane (PDMS) and alkoxy-siloxane resin. The fabricated coatings exhibited long-lasting icephobic characteristics, resulting in reduced amount of ice accumulated on the surfaces. This reduction in ice adhesion is related not only to the slippery behavior of the coatings but also the formation of unfrozen hydrogen-bonded molecules. The coatings exhibited desired stability against weathering conditions, such as UV exposure and humidity. The electrical characteristics of the prepared coatings were evaluated using dielectric spectroscopy, flashover, condensation, and inclined plane tests. Accordingly, the coatings containing lubricant-loaded carriers showed increased flashover voltage in dry, wet, and polluted states and reduced leakage currents in the condensation test.
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Acknowledgements
The authors acknowledge all support from the Natural Sciences and Engineering Research Council of Canada (NSERC), Hydro-Québec, and PRIMA Quebec. The authors would like to thank CENGIVRE for providing the icing infrastructure and Ms Caroline Blackburn at the Anti-icing Materials International Laboratory (AMIL), UQAC, for hel** carry out the SAT test. They also would like to give very special thanks to Frederick Munger for performing the high voltage tests.
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SH contributed to conceptualization, methodology, investigation, formal analysis and experiment performing, Planning and results interpretation, visualization, writing—original draft, and writing—review & editing. GM contributed to conceptualization, supervision, resources, writing—review & editing, project administration, and funding acquisition. RJ helped in conceptualization, supervision, resources, and writing—review & editing.
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Heydarian, S., Momen, G. & Jafari, R. Icephobicity and electrical assessment of slippery coating impregnated with a stabilized hydroxyl-terminated lubricant for high voltage insulation application. J Mater Sci 58, 9264–9281 (2023). https://doi.org/10.1007/s10853-023-08600-6
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DOI: https://doi.org/10.1007/s10853-023-08600-6