16 February 2004 High-temperature fatigue strength of crack-healed Al2O3 toughened by SiC whiskers
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Abstract
Al2O3 reinforced by SiC whiskers (Al2O3/SiC-W) was sintered in order to investigate the fatigue strength of crack-healed specimens at high temperature. A semi-elliptical surface crack of 100μm in surface length was introduced on each specimen surface. These specimens were crack-healed at 1300°C for 1 h in air, and static and cyclic fatigue strengths were systematically investigated at room temperature, 900°C, and 1100°C by three-point bending. The static and cyclic fatigue limits of the crack-healed specimens were more than 70% of the average bending strength at each testing temperature. Crack-healed specimens of Al2O3/SiC-W were not sensitive to static and cyclic fatigues at room temperature and high temperatures. Therefore, the combination of crack-healing and whisker reinforcement can play an important role in increasing static and cyclic fatigue strengths at high temperature.
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Kotoji Ando, Kotoji Ando, Sang-Kee Lee, Sang-Kee Lee, Koji Takahashi, Koji Takahashi, Masahiro Yokouchi, Masahiro Yokouchi, } "High-temperature fatigue strength of crack-healed Al2O3 toughened by SiC whiskers", Proc. SPIE 5648, Smart Materials III, (16 February 2004); doi: 10.1117/12.580720; https://doi.org/10.1117/12.580720
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