The microstructures of the thermally grown oxide (TGO) in as-coated electron beam physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) were examined by scanning transmission electron microscopy (STEM) as a function of demonstrated TBC lifetime in a thermally cycled environment. As-coated TBC specimens were selected for analysis based on individual statistical significance in overal...

Abstract A mechanochemical model is proposed to investigate the non-uniform oxidation of thermal barrier coatings (TBCs) that involves large inelastic deformation and nonlinear reaction kinetics. The large-deformation theory incorporates higher-order term geometric nonlinearity for a more precise description stress evolution in an oxide layer. effect stresses on kinetics considered, which expre...

Abstract Calcium-magnesium-alumina-silicate (CMAS) corrosion is a serious threat to thermal barrier coatings (TBCs). Ti 2 AlC has been proven be potential protection layer material for TBCs resist CMAS corrosion. In this study, the effects of pellet surface roughness and temperature on microstructure pre-oxidation behavior were investigated. The results revealed that produced inner Al O 3 outer...

In the combustion chambers of gas turbine engines, ZrO2-8wt.%Y2O3 (YSZ) TBCs are commonly applied by air plasma spray (APS) using Ar-/H2-based plasmas via legacy torches. Alternatively, N2/H2 could be used with potential increasing overall deposition efficiency (DE) and hence reduce consumption high-value feedstock powder. Also, DE, spraying time would reduced, thereby providing another contrib...

Numerous cracks can be observed in the top coat of thermal barrier coatings (TBCs) deposited by the atmospheric plasma spraying (APS) method. These cracks can be classified into vertical and horizontal ones and they have opposite impact on the properties of TBCs. Vertical cracks reduce the residual stress in the top coat and provide strain tolerance. On the contrary, horizontal cracks trigger d...

Artificial intelligence (AI), machine learning (ML) and deep (DL) along with big data (BD) management are currently viable approaches that can significantly help gas turbine components’ design development. Optimizing microstructures of hot section components such as thermal barrier coatings (TBCs) to improve their durability has long been a challenging task in the industry. In this paper, liter...

Abstract Sc was doped into Gd 2 Zr O 7 for expanding the potential thermal barrier coating (TBC) applications. The solid solution mechanism of in lattice, and mechanical thermophysical properties Gd2Zr2O7 were systematically studied by first-principles method, based on which doping content optimized. Additionally, Sc-doped TBCs with optimized composition prepared air plasma spraying using YSZ a...

Ti2AlC has been demonstrated as a promising protective layer material for thermal barrier coatings (TBCs) against calcium-magnesium-alumina-silicate (CMAS) attack. In this study, the reliability of CMAS corrosion was explored, and new Ti2AlC/YSZ TBCs more efficiently resistant to were designed. The fabricated inevitably contain some impurity phases (TiC Al2Ti<su...