热障涂层热震失效寿命定量计算的研究

Thermal Shock Failure Life Calculation of TBCs

研究了热障涂层的热震失效，认为涂层热震失效的本质为应力疲劳失效．建立了涂层热震失效寿命理论计算公式，并用实验结果对公式进行了验证，证明公式能很好地拟合实验结果．提出了评价涂层抗热震性能的指标-临界热震温差范围△Tc．该工作为估算涂层寿命及减少实验工作量提供了理论依据．

The thermal shod failure life of thermal barrier coatings (TBCs) was studied. A mathematicalmodel of thermal shock failure and theoretical calculation formula of the coatings' thermal shodfailure life were established. It is shown that the thermal shock failure mechanism of caatings isthermal stress fatigue destruction and that the formula accords well with the test results. Thecritical temperature range aTe in thermal schok can be used to evaluate the coating's resistanceto thermal cycling. This work provides a theoretical basis for evaluating the coating's lifetime andreducing test work.