抄録
It has become popular to increase thermal efficiency by applying Thermal Barrier Coatings (TBC) to hot gas path parts in gas turbines. On the other hand, some uncertainty about the delamination life prediction method for TBC still remains. In this report, the influences of mechanical parameters on delamination behavior were investigated through thermo-mechanical fatigue tests, to improve the delamination life prediction method for TBC. The selected parameters were loading pattern, ceramic coating thickness, and high temperature pre exposure. Delamination behavior with an Out of Phase loading pattern seemed to better correspond to behavior under simulated loading than did that with In Phase loading. The results strongly suggest that an optimum ceramic coating thickness keeps the cooling performance consistent with delamination strength. However, high temperature pre-exposure seemed not to affect the delamination initiation life; pre-exposure appeared to decrease delamination growth resistance properties.
