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Coupled Effects of Temperature Gradient and Oxidation on the Thermal Barrier coating Failure

材料科学与工程学报 2000年第Z1期20卷 412-425页

作者： Y.C.Zhou Fracture Research Institute Tohoku University Sendai Japan Institute of Fundamental Mechanics and Material Engineering Xiangtan UniversityXiangtan Hunan 411105 P. R. China Fracture Research Institute Tohoku University Sendai Japan

The present article reviews the investigation about the coupled effects of temperature gradient and oxidation on the failure of thermal barrier ceramic coatings in the past ten years in our laboratory. The investigations include the experimental and theoretical study. On the experimental investigation, the heating method, non-destructive evaluation and interface properties are mainly reviewed. An attempt is done for developing four different heating methods, which are furnace heating, burner heating, plasma heating and laser beam heating. The non-destructive evaluation such as temperature test, acoustic emission (AE) signals detected and impedance spectroscopy (IS) method are successfully used in the study of TBCs system degradation. The interface properties such as oxidation and fracture toughness are studied by test and observation. On the theoretical investigation, the temperature fields and the related thermal stresses fields are analytical solved where the coupling effect of temperature gradient, oxidation, thermal fatigue, creep, morphology of the TBC system as well as the cooling rate are considered. The delamination cracking in thermal barrier coating system with ceramic coating deposited on a substrate is analytical studied. Due to the complication of TBCs degradation, a real physical map of TBCs system failure is not obtained up to now. The investigation on the further is proposed.

关键词： Thermal Barrier coating temperature gradient experimental investigation impedance spectroscopy temperature fields fracture toughness theoretical study temperature test ceramic coatings coupling effect coating system physical map cooling rate laser beam used in

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