Oxidation-Resistant Fibre Coatings For Non-Oxide Ceramic Composites

Oxidation of fibre/matrix interfaces can degrate the strength and toughness of ceramic composites containing non-oxide constituents. Oxidation can occur when the fibre ends are exposed or in the presence of cracks. Theoretical considerations indicate that, contrary to popular belief, oxide fibre coatings should be worse than non-oxide fibre coatings for protection against oxidation. Furthermore, oxidation of fibre/matrix interfaces is a composite system problem rather than that of the fibre coating.