Effect of ND on Thermodynamic Performance of SiO2/Epoxy Composite Insulation Materials

The development direction of high power density and compactness of power equipment puts forward higher requirements for the performance of epoxy insulation materials under high temperature environment. The doping of micron SiO2 effectively improves the thermal conductivity of epoxy composites, but reduces the heat resistance and mechanical performance. This study proposes a method to improve the thermomechanical performance of SiO2/epoxy composites with nano diamond (ND). The results showed that the inhibitory effect of ND on SiO2 agglomeration and its excellent intrinsic thermal conductivity and hardness successfully increased the $\mathrm{T}_{\mathrm{g}}$, thermal conductivity and bending strength of SiO2/epoxy composites by 9.94%, 5.59% and 9.94%, respectively, when the addition of ND was 6wt%. The addition of ND brings further improvement to the thermodynamic performance of SiO2/ epoxy composites. This study provides a feasible method for improving the thermodynamic performance of epoxy composite insulation materials.