DEVELOPMENT OF NANO AND MICRO SILICON CARBIDE INCORPORATED CARBON CERAMIC COMPOSITES

Abstract

Carbon based materials have many potential applications in widely ranging fields because of their unique properties like light weight, low coefficient of thermal expansion, high strength, high thermal conductivity and corrosion resistance. The use of carbon material for high temperature applications is limited due to their susceptibility to oxidation in air at temperatures as low as 400°C. The solution to the above serious drawback can be solved by developing oxidation resistant composites. Attempts to inhibit oxidation of carbon materials by coating the carbon substrate with oxidation resistant refractory oxides and carbides and also by doping them with boron and carbon containing compounds led to limited success. The incorporation of ceramic carbides into the substrate during the processing of the composites resulted in carbon ceramic composites exhibiting oxidation resistance in the range 800°C -1200°C for extended hours. Introduction of nano- SiC in place of micro-SiC in carbon cer...