Thermal shock fatigue behavior of TiC/Al2O3 composite ceramics |
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Authors: | Tingzhi SI Ning LIU Qing'an ZHANG Xianqing YOU |
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Affiliation: | aSchool of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China;bSchool of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China |
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Abstract: | The thermal shock fatigue behaviors of pure hot-pressed alumina and 30 wt.% TiC/Al2O3 composites were studied. The effect of TiC and Al2O3 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 (ΔT) and number of thermal cycles (N) on fatigue crack growth (Δa). The mechanical properties and thermal fatigue resistance of TiC/Al2O3 composites are remarkably improved by the addition of TiC. The thermal shock fatigue of monolithic alumina and TiC/Al2O3 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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Keywords: | ceramic matrix composites TiC/Al2O3 composites thermal shock fatigue fatigue behavior fatigue resistance |
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