(2) Reduce the internal resistance of thermal conductive silicone rubber
The irreversible thermal creep of thermally conductive silicone rubber is mainly attributed to its excessive internal resistance, which comes from the steric hindrance caused by the accumulation of powder and the interaction force between the powder and the surface of silicone rubber. The main methods to reduce internal resistance include: (1) optimizing the selection, shape, and grading of thermal conductive powders to reduce the steric hindrance caused by powder accumulation; (2) Properly modify the surface of the thermal conductive powder by introducing a compatibilizer to reduce the interaction force between the powder and the surface of the silicone rubber.
Through the above methods, the resistance required to restore the microstructure of thermal conductive silicone rubber to its original state after thermal creep can be reduced. This not only improves the reliability of thermal conductive silicone rubber, but also helps to reduce its hardness and compressive stress, and enhance its flexibility and compressibility.