Abstract
Heat conduction behavior of Al 2O 3-Cr 3C 2 composite with Cr 3C 2 content varying from 0 to 40% in volume were investigated using a laser-flash method. Thermal diffusivity of the composite decreased sharply as first incorporating 10 vol.% of Cr 3C 2, then increased with further increase of Cr 3C 2 content up to 40 vol.%. Similar trends were observed for thermal conductivity behaviour. The significantly decreased thermal diffusivity as well as thermal conductivity at lower content of Cr 3C 2 was assumed to be ascribed mainly to the formation of “composite grain” wherein the fine Cr 3C 2 particle being trapped into Al 2O 3 grain. Furthermore, the formation of an amorphous layer with thickness approx. 10 Å at inclusion/matrix interface may also act as a barrier to phonon conduction.
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