Comprehensive excellent performance for silicone-based thermal interface materials through the synergistic effect between graphene and spherical alumina

Rapid heat dissipation is the pain point of modern miniaturized electronic equipment and components. High-power and high-efficiency operation puts forward higher requirements on the heat transfer capability of thermal interface materials (TIM). In this work, taking advantage of synergistic effect between thermally conductive fillers graphene and alumina (Al₂O₃), thermal grease-based TIM was prepared. Secondly, the effects of temperature and pressure on the thermal interface resistance were studied. Lastly, coating thickness and thermal stability of thermal grease-based TIM were tested. These results show thermal conductivity of composite as high as 4.38 W/(m K). The interface thermal resistance is as low as 0.243 °C cm²/W (80 °C, 60 psi) in case that the temperature and pressure strain capability within a certain range are subsequently considerable. Furthermore, the oil leakage is fractional when the silicone grease was placed at 80 °C for 600 h, showing good thermal stability.