Quantitative Characterization of the Interfacial Damage in EB-PVD Thermal Barrier Coating
Source abstract
Abstract
Considering the influence of non-equibiaxial stress state and initial residual strain on the compressive buckling of the ceramic layer, a quantitative characterization method of the damage generated at the interface between the top coat and bond coat in thermal barrier coating based on uniaxial compression was developed. It was verified by the axial compression tests of the single crystal specimens with EB-PVD thermal barrier coating after undergoing various isothermal oxidation times and thermal cycles. On this basis, the correlations between the measured interfacial damage and the thermal loads experienced as well as the thickness of thermally grown oxide (TGO) were analyzed. The results show that the critical compressive strain inducing the spallation of thermal barrier coating at room temperature can effectively characterize the accumulation of interfacial damage caused by isothermal oxidation and thermal fatigue. Under the same TGO thickness, the damage caused by thermal fatigue is greater than that caused by isothermal oxidation. The total damage generated in thermal barrier coating can be divided into three parts: oxidatively driven damage related to TGO thickness, mechanically driven damage related to stress–strain cycles in the coating, and their interaction, where the interaction term is negative.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Advanced ceramic materials synthesis · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Aero Engine Academy of China, Aero Engine (Group) Corporation of China, Beijing 101304, China
Institute for Aero Engine, Tsinghua University, Beijing 100084, China
Sichuan Gas Turbine Establishment, Aero Engine (Group) Corporation of China, Chengdu 610500, China
Joint Research Center for Extreme Environment and Protection Technology, Xi’an Jiaotong University, Xi’an 710049, China
Funding
National Natural Science Foundation of China · National Science and Technology Major Project
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Show source-provided references
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