Growth of Continuous Diamond Film by Hot Filament C VD Technique on SiC/TiC Pellets, Synthesized Using Combustion Synthesis

Abstract

Abstract β-SiC/TiC composites were synthesized using the process of self propagating-high temperature combustion synthesis (SHS). The heat released during the exothermic reaction between the metal and the carbon powder results in the melting of silicon and the titanium into which the carbon diffuses and then (3-SiC and TiC precipitates out from the supersaturated solution. The composite was characterized using X-ray diffraction techniques, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. An attempt was made to understand the mechanism of formation of the composite. A theory is proposed for the possible mechanism based on dissolution, diffusion and precipitation from the supersaturated solution. Diamond film was then grown on the pellet by hot filament CVD technique using methane and hydrogen gas as the reactants. The deposition was conducted for a period of four hours. A continuous film of diamond was found to grow on β-SiC/TiC composite using this technique. The diam...