Thermal barrier coating is subjected to out-of-plane displacements and possible in-plane cracks as thermally grown oxide (TGO) grows at high temperatures. Three different schemes of TGO growth are carried out in a three-dimensional thermal barrier coating model, in order to discuss the growth mechanism of the TGO film and to analyze the growth-induced stress within the top-coat. They are respectively 1) that the TGO film uniformly thickens along the whole thickness; 2) that the TGO film uniformly thickens along the bottom; 3) and that the TGO film linearly thickens at the bottom. The TGO film is found to possess the maximum thickness at the crest and the minimum one at the middle. The difference between the maximum and minimum thicknesses reflects the irregularity of TGO thickness distribution, which causes significant displacement incompatibility within the top-coat. The displacement incompatibility makes the top-coat subjected to out-of-plane compression around the crest and out-of-plane tension around the middle. The TGO growth scheme affects the TGO thickness distribution and the out-of-plane stress within the top-coat. Additionally, the lengthening-to-thickening ratio is employed to study the effect of the lengthening strain rate on the TGO thickness and the top-coat stress. The top-coat stress is very sensitive to the lengthening strain rate, and reducing the lengthening strain rate is helpful in enhancing the lifetime of thermal barrier system.

随着热生长氧化物 (TGO) 在高温下生长，热障涂层会发生平面外位移和可能的平面内裂纹。在三维热障涂层模型中进行了三种不同的 TGO 生长方案，以讨论 TGO 薄膜的生长机制并分析顶涂层内的生长诱导应力。它们分别是1）TGO薄膜沿整个厚度均匀增厚；2）TGO薄膜沿底部均匀增厚；3) 并且 TGO 薄膜在底部线性增厚。发现 TGO 膜在顶部具有最大厚度，在中间具有最小厚度。最大和最小厚度之间的差异反映了TGO厚度分布的不规则性，这会导致面漆中出现明显的置换不相容性。位移不相容性使面漆在波峰周围受到面外压缩，在中部周围受到面外张力。TGO 生长方案影响 TGO 厚度分布和面漆内的面外应力。此外，采用伸长增厚比来研究伸长应变率对 TGO 厚度和面漆应力的影响。面层应力对拉长应变率非常敏感，降低拉长应变率有利于提高热障系统的寿命。TGO 生长方案影响 TGO 厚度分布和面漆内的面外应力。此外，采用伸长增厚比来研究伸长应变率对 TGO 厚度和面漆应力的影响。面层应力对拉长应变率非常敏感，降低拉长应变率有利于提高热障系统的寿命。TGO 生长方案影响 TGO 厚度分布和面漆内的面外应力。此外，采用伸长增厚比来研究伸长应变率对 TGO 厚度和面漆应力的影响。面层应力对拉长应变率非常敏感，降低拉长应变率有利于提高热障系统的寿命。