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Abstract

This paper investigates the conditions necessary for production of a silicon carbide matrix composite, reinforced with pitch-based carbon fibre by infiltration of a uni-directional lay-up with an aqueous ceramic powder suspension containing SiC and the liquid phase forming additives alumina and yttria, and consolidation by hot-pressing, with the eventual aim of including Hi-Nicalon silicon carbide fibre. The interfaces produced when composite samples are densified with and without the application of mechanical pressure are compared by energy-dispersive X-ray (EDX) analysis and a first indication of mechanical properties obtained from four point bending. Background to the chemical and physical development of the interface during processing is provided by the results of an extensive study of the effects of varying alumina and yttria additive concentration sintering temperature, hold time and sintering environment on the density, microstructure and chemical composition of free sintered silicon carbide. The effect of these sintering variables on free sintered tows of un-coated and pyrolytic carbon coated carbon fibres are also detailed.

Additional information

Authors: FARRIES P M, JRC Petten (NL);VEYRET J-B, JRC Petten (NL)
Bibliographic Reference: Paper presented: 11th International Conference on Composite Materials, Gold Coast (AU) 14-18 July, 1997
Availability: Available from (1) as Paper EN 40857 ORA
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