Surface charges will accumulate on the surface of epoxy resin insulators under electric field effect

which cause the surface flashover in serious cases and threaten the safe operation of power system and electrical equipment. Therefore

in this paper

the nano-SiC was fluorinated by CF4/Ar plasma in order to change the interfacial characteristics of nanocomposites. The epoxy composite coating materials doped with different mass fractions fluorinated nano-SiC were coated on epoxy substrates with three different thicknesses

and the surface potential and DC flashover were tested. The experimental results show that

with the increase of the content of filler in the epoxy coating

the flashover voltage and the surface charge dissipation rate increases

and the trap energy level and density decrease. Increasing the coating thickness can also increase the flashover voltage of samples. The flashover voltage of sample coated by 600 μm composite coating doped with 5% fluorinated nano-SiC is 18.7% higher than that of uncoated sample. As a convenient and effective method

plasma fluorinated nano-SiC/epoxy composite coating has bright application prospects in reducing the operational faults of electrical equipment.