Development of carbon–ceramic composites

Abstract

Carbon–ceramic composites (C–SiC–B 4C) were developed through in situ formation of silicon carbide by mixing coal-tar based green coke and silicon as silicon carbide (SiC) precursor, boron carbide (B 4C) and heat-treatment to 2200 °C. These composites were characterised for their physical, mechanical and oxidation resistance properties. The formation of protective coatings during oxidation of the composites was confirmed by using X-ray diffraction, energy-dispersive X-ray spectrometry, scanning electron microscopy and porosity measurement. Carbon–ceramic composites, which could withstand oxidation at 800–1200 °C for about 10 h in air have been developed.