Preparation and Thermal Properties of CVD⋅TiC-C Composite Materials

Abstract

For the fundamental study on the fabrication processes of CVD⋅TiC/C functionally gradient materials, TiC-C composites in the C/(TiC+C) from 0 to 95 mol% were prepared by chemical vapor deposition (CVD) of a TiCl₄-CH₄-H₂ system. The TiC-C composites from TiC to TiC-95.2mol%C were prepared by controlling C/Ti ratio in input gas. Thermal properties of the composites were affected by the composition and morphology of C phase and micro-voids. The thermal conductivity of the composites depended on the composition and densities. The thermal expansion coefficients of CVD⋅TiC-C composites up to about 50 mol% TiC nearly equal to that of CVD⋅TiC.