Tailoring Temperature Dependent Conductivity of Epoxy/SiC Composite for Emerging DC Application

The increase of power density with the volume reduction brings great challenges to epoxy resin material for DC insulation. In this paper, the SiC/epoxy resin composites with different amount of SiC with different crystal morphology were fabricated to study the effects of crystal morphology and temperature on non-linear conductivity characteristics. Research results illustrated that the β-SiC particles can provide a higher non-linear conductivity compared with the α-SiC particles. The temperature also affected the non-linear conductivity of the composites. When the α-SiC content was low, the non-linear conductivity of the composites increased rapidly with the increase of temperature, but the non-linear conductivity decreased slightly as the temperature increased when the filler concentration was large enough. The emerging insulation material obtained by SiC modified epoxy resin can effectively uniform the electric field distribution of the power equipment.