Abstract
ZrO2/SiC composite ceramics were sintered and subjected to three-point bending. A surface crack of 100μm in diameter was made on each specimen. We studied crack-healing behavior. The main conclusions are as follows. (1) ZrO2/SiC composite ceramics could heal a crack. Then the best healing condition is 800°C × 30h in air. (2) A crack was healed even at 600°C, which was a very low temperature compared with other ceramics. (3) The ZrO2/Y2O3/SiC system ceramics caused an extensive corrosion at over 1000°C. (4) Healing temperature and the minimum -time to heal were in the good proportional relation on the Arrhenius diagram at 600–800°C.
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