The lifespan of plasma-sprayed thermal barrier coating (TBC) systems is difficult to predict owing to the variety of microstructures and deterioration histories. In this study, we developed a novel TBC damage model to reflect deterioration histories; thus, it can be applied to various TBCs. Damage to TBCs is classified into oxidation and mechanical damage; therefore, a detailed deterioration history can be reflected. In addition, by introducing a virtual S–N diagram, a life prediction model that can be applied to TBCs with various microstructures was established. We used the proposed damage and life prediction models in isothermal aging and thermal cycle tests with different aging cycles. The predicted lifespan of TBCs by using the proposed models was within 95% of the results obtained by performing actual tests in the temperature range of 1150–1350°C.

由于微观结构和劣化历史的多样性，等离子喷涂热障涂层 (TBC) 系统的寿命难以预测。在这项研究中，我们开发了一种新的 TBC 损坏模型来反映恶化历史；因此，它可以应用于各种TBC。TBCs的损伤分为氧化损伤和机械损伤；因此，可以反映详细的劣化历史。此外，通过引入一个虚拟的S - N图，建立了可应用于具有各种微结构的TBC的寿命预测模型。我们在具有不同老化周期的等温老化和热循环测试中使用了所提出的损伤和寿命预测模型。使用所提出的模型预测的 TBC 寿命与在 1150-1350°C 的温度范围内进行实际测试所获得的结果相差不到 95%。