セラミック基複合材料の高温疲労損傷への直流電位差法の適用

抄録

Ceramic matrix composites (CMCs) have attracted much attention as lightweight and ultra-high heat-resistant materials for aircraft gas turbine engines. Since the fracture process of CMCs is very complex, a non-destructive method with high accuracy has been desired for safe use of CMCs. Many kinds of non-destructive methods have been proposed for damage monitoring and the direct-current potential difference method (DC-PDM) is known as one of the best techniques to identify small cracks and voids not only in monolithic materials but composite materials. In this study, DC-PDM is applied to non-damaged and high-temperature-fatigued specimens of CMC and its applicability is examined. Although the resistance depends on the location of the specimen, the fatigued specimen showed very high values. This result suggests that DC-PDM is applicable to high-temperature fatigue damage of CMC.