Abstract
The thermal shock fatigue behaviors of pure hot-pressed alumina and 30 wt.% TiC/Al 2O 3 composites were studied. The effect of TiC and Al 2O 3 starting particle size on the mechanical properties of the composites was discussed. Indentation-quench test was conducted to evaluate the effect of thermal fatigue temperature difference (Δ T) and number of thermal cycles ( N) on fatigue crack growth (Δ a). The mechanical properties and thermal fatigue resistance of TiC/Al 2O 3 composites are remarkably improved by the addition of TiC. The thermal shock fatigue of monolithic alumina and TiC/Al 2O 3 composites is due to a “true” cycling effect (thermal fatigue). Crack deflection and bridging are the predominant reasons for the improvement of thermal shock fatigue resistance of the composites.
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