The use of diamond-filled polymers as thermally conductive composites.

A need for a material that combines excellent thermal conductivity with high electrical resistivity has been identified in the electrical industry. As many materials currently exist that conduct both materials the investigation was carried out into a ceramic filled polymer. Diamond was chosen as the filling material due to its exceptionally high thermal conductivity. Three polymer materials were investigated as matrices for this material. The materials used were silicone rubber, polyester and a paint based on poly vinyl chloride. A study of method of production and mixing was first carried out to find the best route to produce the composite by ensuring even dispersion and ease of application. Various examination techniques were employed to find the success of the different processes. These methods were calibrated and optimised. The best methods of mixing and choice of filling material was established. Thermal conductivity tests carried out on the composite materials showed that there was a marked increase in the thermal conductivity of the materials. The strength and thermal expansion of the silicone rubber based material were also increased