NDLI: Quantitative Characterization of the Interfacial Damage in EB-PVD Thermal Barrier Coating

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Quantitative Characterization of the Interfacial Damage in EB-PVD Thermal Barrier Coating

Content Provider	MDPI
Author	Jing, Fulei Yang, Junjie Tang, Shibai Wen, Quan Zhang, Tao Wu, Jian Fan, Xueling
Copyright Year	2022
Description	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.
Starting Page	984
e-ISSN	20796412
DOI	10.3390/coatings12070984
Journal	Coatings
Issue Number	7
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-07-12
Access Restriction	Open
Subject Keyword	Coatings Thermal Barrier Coating Damage Compressive Tests Oxidation Thermal Fatigue Spalling
Content Type	Text
Resource Type	Article

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