The difficulty of supersonic spraying and processing tungsten carbide is that the structure of supersonic spraying tungsten carbide coating is often porous. Unlike normal high-speed supersonic spraying tungsten carbide with porosity less than 2%, the coating properties are expected between 5 ~ 30% ~ 461% and the porosity of supersonic spraying coating may exceed I5%. The porosity of 131 depends on the melting state of the spraying, while the electroluminescent particles depends on the ability of the impact to cause the binding structure. 171 When evaluating dielectric breakdown, the porosity plays a major role in the voltage amount occupied by the insulating layer. If the coating is exposed to wet conditions, moisture accumulates in structural gaps, causing a breakdown voltage reduction. IIS is prevented during supersonic tungsten carbide processing and then sealed. The second consideration is the unchangeable fact that the air is contained in the gap, and that the breakdown voltage of the air is well below the breakdown voltage of the insulating substrate.
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