Influence of interfacial strength on the fracture toughness of glass-ceramic matrix composites

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.

Keywords

composite / interfacial strength / fracture toughness