凯发

Recently, with the miniaturization and increasing power of electronic devices, the heat dissipation has become one of the most critical problems. Thermal greases are a type of thixotropic pastes with high thermal conductivity, can fill the gaps of the mating surface more effectively. graphene is an effective thermally conducting filler to let grease have high thermal conductivity with low filler content. Novel thermal grease with high thermal conductivity and electric insulation is developed by addition of graphene and alumina in this study. Due to the synergistic effects of graphene sheets and alumina particles, a significant thermal conductivity enhancement is observed. Meanwhile, we proposed a correction theoretical model by modifying Burggeman asymmetric model. The date showed that with the addition of graphene is only 1wt%, the maximum thermal conductivity of the novel thermal grease is up to 3.45 W/m∙K. It is significantly improved compared with the thermal grease without graphene. With respect to the silicone base, an enhancement in thermal conductivity of 2553% is obtained. The results proved that the theoretical prediction model we proposed are matched with the experimental data. These synergistic effects will decrease the thermal boundary resistance and enhance the thermal conductivity of the novel thermal grease.