649 炭化珪素セラミックスき裂治癒挙動と治癒材の高温強度特性

抄録

The engineering ceramics are superior in strength than metal at high temperature. However, they are brittle and sensitive to flaws. As a result, the structural integrity of a ceramics component may be seriously affected. Whereas, some engineering ceramics have the ability of crack-healing. If this ability could be used in engineering ceramics components, their reliability will be increased and their life time will also prolonged. This study focuses on the crack-healing behavior of commercial SiC ceramics. The main conclusions obtained were following ; (1) Recommended crack-healing condition by this study was 1h at 1500℃ in air. (2) Maximum crack size which can be healed completely was semi-elliptical surface crack of 450 μm in diameter. (3) Limit of heat resist temperature of crack-healed zone for bending strength was about 600℃.