Rheology Investigations of Highly Loaded Thermally Conductive Silicone Composites

摘要

Thermal conductive compounds are usually heavily loaded with thermally conductive fillers like aluminium oxide, a large thermal conductivity value of the compound (>3Wlm K) demands a high loading in solid because the necessity to create thermal bridges between thermally conductive particles. However, the viscosity of the compound increases sharply for large solid fractions and the compound may be difficult to process industrially. For this reason, it is essential to understand the impact of the filler loading on the viscosity of the compound. Until now, people use empirical rules to select the filler mix that leads to the largest packing density. However, in the field of green concrete research, more evaluated theories have been used to quantitatively predict the viscosity of a solid/liquid mix. A methodology based on those theories is used including the characterization of each filler independently to predict the viscosity of any mix of fillers.