1. Key Laboratory of Engineering Dielectrics and Their Applications, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang 150000
2. State Grid Heilongjiang Electric Power Company Limited Electric Power Research Institute, Harbin, Heilongjiang 150000
With the development of the electrical industry, the power of various electrical equipment and electronic devices is increasing. The demand for insulating materials to dissipate heat has also increased. SR has excellent insulation and stability. Adding high thermal conductivity inorganic fillers to the SR system to improve its thermal conductivity has become a research hotspot in the direction of thermal conductivity of insulation. This paper summarizes the thermal conduction mechanism of the filled composites and the corresponding thermal conduction function model. We combined the functional model to review the influence of the shape, size and interfacial thermal resistance of inorganic fillers on the thermal conductivity of SR. The oriented arrangement of inorganic fillers can make SR obtain higher thermal conductivity with less inorganic fillers. Different preparation methods of thermally conductive SR can affect the filling state of inorganic fillers in SR. According to the characteristics of solid SR and liquid SR, we summarize the preparation methods that can make inorganic fillers arranged in SR according to a certain orientation. Finally, we summarize the research bottlenecks of thermally conductive SR and prospect its future research directions.