Interfacial Reaction in Carbon Fibre-Sialon Ceramic Composites

摘要

Sintering and interfacial reaction have been studied in a composite of sialon matrix with chopped carbon fibre reinforcement. It has been shown that at relatively low temperature (1500℃) there is a little α to β transformation in the reaction sintered matrix, no interfacial reaction (the carbon fibre is unaltered by the firing cycle) and 20% apparent porosity. As the temperature is increased to 1550℃ and 1600℃, a corresponding increase in both transformation and density occur but accompanied by significant interfacial reaction. The nature of these changes is quantified and the microstructures determined by electron microscopy. The observations are interpreted in terms of interface chemistry, and transport mechanisms in both the gas and liquid phases are explained. Optimised procedures for fabrication are suggested.