抄録
A Kinetics model for strength recovery by oxidation-induced self-crack-healing in the alumina/SiC particles composites was proposed using the oxidation kinetics of SiC and process zone size fracture criteria on the basis of nonlinear fracture mechanism. Reported experimental results suggested that the strength recovery follows the mass gain of oxidation products. Thus, we estimated the remaining crack length using healing ratio, f_<CH>=ΔV_<CB>/V_C, where V_C is the volume of precrack, ΔV_<CH> is the mass gain due to the self-healing, which is estimated from oxidation kinetics of the sintered SiC together with microstructural features of SiC distribution. When f_<CH> ≥ 1, the crack is completely healed. When f_<CH>< 1, crack ealing is inadequate. Furthermore, we proposed the upper and lower limit model for recovered strength at f_<CH>< 1 as bridging and degeneracy models, respectively, and compared the proposed model with reported experimental results.
