Time-dependent elastic modulus recovery measurement on thermally shocked SiC fibre-aluminosilicate composites, machinable glass ceramics and polycrystalline alumina

Time-dependent partial recoveries in Young's modulus were observed for thermally shocked specimens of three ceramic materials: an SiC fibre-aluminosilicate composite, a machinable glass-ceramic, and a polycrystalline alumina. The observed Young's modulus recovery is likely to be due to room-temperature microcrack healing. The room-temperature modulus recovery rates measured in this study are compared to the physical property recovery rates obtained from an analysis of data in the literature for other cracked ceramics.