ジルコニア／SiC複合セラミックスのき裂治癒挙動

抄録

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.