ABSTRACT Y2O3-ZrO2 thermal barrier coatings on a GH2132 alloy were fabricated by atmospheric plasma spraying method. Failure behaviours of the thermal barrier coatings under the combined condition of hot corrosion and thermal shock were investigated. Surface and cross-sectional morphologies of thermal barrier coatings before and after exposures were assessed by using scanning electron microscopy. It was established that the main failure mode was the formation of net-like cracks in coatings and penetrating cracks to the bond coat/substrate interface. By detailed consideration to the analysis of X-ray diffraction and morphologies, the effect of hot corrosion on the failure of thermal barrier coatings was inferred to be due to the induced stress during the cooling stage of the combined condition, which was prone to induce the crack formation.

中文翻译：

---

Y2O3-ZrO2热障涂层在热腐蚀和热冲击联合作用下的失效行为

摘要 GH2132 合金上的 Y2O3-ZrO2 热障涂层是通过大气等离子喷涂方法制造的。研究了热腐蚀和热冲击复合条件下热障涂层的失效行为。通过使用扫描电子显微镜评估暴露前后热障涂层的表面和横截面形态。已确定主要失效模式是在涂层中形成网状裂纹和穿透涂层/基材界面的裂纹。通过对 X 射线衍射和形貌的详细分析，推断热腐蚀对热障涂层失效的影响是由于组合条件冷却阶段产生的诱导应力，该应力易于诱导热障涂层失效。裂纹形成。