Synthesis and Properties of a Novel Coating Material with High Thermal Conductivity and Insulation for Busbar

A novel coating material using polymethylvinyl silicone rubber as the base gum and aluminum nitride (AlN) as the thermal conductive filler was presented, and its mechanical property and thermal conductivity were measured. The results indicated that with increasing the content of AlN filled into the silicone rubber, the thermal conductivity, mechanical property and dielectric loss of the resulting heat conductive material increased while the dielectric strength decreased. And the effect of the particle size of AlN on thermal conductivity of filled silicone rubber showed that the thermal conductivity of silicone rubber filled with large size particle was better than that of silicone rubber filled with small size particle.