Abstract
Self-crack-healing is one of the most valuable phenomena to overcome the decrease in reliability of ceramics caused by cracking. This is because self-healing is triggered by crack initiation and gives complete strength recovery through the passive oxidation of SiC. Thus, self-healing ceramics are candidates for high-temperature materials for gas turbine components, i.e., turbine blades and stator vanes. Nano-composite and multi-composite concepts for self-healing ceramics are described. The design concept is based on ‘damage management’ rather than ‘damage prevention’. The kinetics of self-crack-healing of ceramic/SiC composites including the effects of temperature and oxygen partial pressure is introduced. The time for crack-healing with low oxygen partial pressure can be estimated. Furthermore, the effects of oxygen partial pressure on self-healing under tensile stress are discussed. The design stress of ceramic turbine blades with self-crack-healing is considered.
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