アルミナコーティングの密着強さに及ぼす基材高温予加熱の影響

抄録

SiC/SiC composites are attracting attention as high-temperature structual materials. However, SiC/SiC composites has low corrosion resistance due to vapor oxidation in high-temperature combustion atmospheres. To prevent steam oxidation thinning, protective coatings to protect SiC/SiC composites from the corrosion attacks are essential and critical technology. The influence of residual stress on the adhesion of protective coatings is essential. It is known well that pre-heating the SiC/SiC composite substrate before the thermal spray process affects the residual stress. In this study, the effect of the substrate pre-heating temperature on the adheasion strength in a protective alumin acoating sprayed on the SiC substrate was investigated by indentation tests.