Abstract
Nine kinds of glass-ceramic matrix composites with different compositions and interfacial strength (τ s) were prepared. The influence of τ s on the fracture toughness(K 1c) of composites was studied. It was discoved that, for the system no chemical reaction taking place at the interface, K 1c increased proportionally with τ s increasing at the first stage, then decreased when τ s reached a certain value. According to this result, a model of relationship between τ s, thermal mismatch (Δα r) and K 1c was built up. If a chemical reaction took place and a new phase was formed in the interface, the K 1c of composite was effected by the combination of τ s, chemical bonding, radial interfacial stress and other factors.
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