Review of Numerical Simulation of TGO Growth in Thermal Barrier Coatings

Wen, Quan; Jing, Fulei; Zhang, Chang Xian; Tang, Shibai; Yang, Jinn‐Shyong

doi:10.32604/cmes.2022.019528

Cited by 1 publication

(2 citation statements)

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“…Therefore, TGO would cause the TBC to spall when it grows to a critical thickness [7][8][9][10][11][12]. According to the fabrication processes of ceramic layers, TBC can be divided into air plasma spraying (APS) [13] and electron beam physical vapor deposited (EB-PVD) [14]. As shown in Figure 1, the ceramic layer of APS has a lamellar structure with high porosity and good heat insulation and is mainly used for high-temperature static structures such as turbine guide vanes, combustion chambers, and tail nozzles.…”

Section: Introductionmentioning

confidence: 99%

“…It has been experimentally shown that the damage of TBC is characterized by nonlinear accumulation, which is significantly different from that of conventional metallic materials, and the classical Miner linear damage accumulation theory is no longer applicable [16]. For TBC deposited by the EB-PVD According to the fabrication processes of ceramic layers, TBC can be divided into air plasma spraying (APS) [13] and electron beam physical vapor deposited (EB-PVD) [14]. As shown in Figure 1, the ceramic layer of APS has a lamellar structure with high porosity and good heat insulation and is mainly used for high-temperature static structures such as turbine guide vanes, combustion chambers, and tail nozzles.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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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