熱サイクル中の曲率を用いた遮熱コーティングの温度依存ヤング率評価

抄録

Thermal Barrier coatings (TBCs) are used to protect the hot sections of gas turbine engines and airplane engines, and help maintain lower temperature of the underlying superalloy substrate. The TBC system comprises a substrate, bond coat, and TBC top coat. Temperature-dependent Young's modulus of TBC is an essential mechanical property as they allow the evaluation of parameters of material mechanics. In order to evaluate temperature-dependent Young's modulus of TBC, we used the thermal stress model of three-layered material and the deflection during a thermal cycling. First, we verified experimentally the effectiveness of the model. Further, we successfully evaluated the temperature-dependent Young's modulus up to 700°C for TBC specimens with various preheat treatment.