Low thermal impedance phase change thermal interface materials

Abstract

A phase change thermal interface material including a thermally conductive filler, a phase change wax, a coupling agent, and a polymer matrix material. The thermally conductive filler includes from about 50 wt. % to about 70 wt. % aluminum powder; from about 19 wt. % to about 30 wt. % aluminum oxide; and from about 1 wt. % to about 9 wt. % zinc oxide, based on the total weight of the phase change thermal interface material. The phase change thermal interface material has a thermal impedance from about 0.02 °Ccm2 / W to about 0.04 °Ccm2 / W, as determined by ASTM D5470.