Prediction of growth behavior of thermally grown oxide considering the microstructure characteristics of the top coating

Kim, D.; Kim, K.K.; Moon, Byungwoo; Park, K.B.; Park, Saerom; Seok, Chang-Sung

doi:10.1016/j.ceramint.2021.02.003

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…The layers have different thermomechanical properties. That is, the significant differences in thermal conductivity and coefficient of thermal expansion (CTE) between the TC (machined from ceramic) and substrate lead to thermal mismatch deformation between layers and introduce severe thermal mismatch stress between layers [12][13][14]. Therefore, it is of great engineering significance to accurately analyze the stress on the interface of layers near the free edges of TBCs to reasonably evaluate the performance and reliability of TBC systems.…”

Section: Introductionmentioning

confidence: 99%

Simulations of Effects of Geometric and Material Parameters on the Interfacial Stress of the Thermal Barrier Coatings with Free Edges

et al. 2023

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Interfacial stress between layers of thermal barrier coatings near free edges is a critical factor that may cause turbine blades to fail. This paper uses simulation methods to reveal the effects of variations in geometric and material parameters on the stress of thermal barrier coatings. The stress distributions of a disk-shaped coating–substrate system undergoing thermal mismatch are calculated by an analytical method and the finite element method. The analytical solution reveals that the coefficient of thermal expansion, elasticity modulus, Poisson’s ratio, and thickness of each layer affect interfacial stress between coatings and substrate. The simulation results exhibit significant concentrations of the normal and shear stresses, which make the coating system prone to cracking and spalling from the free edge. The parametric analysis highlights that the thermal mismatch strain affects the stress magnitude. The region affected by free edges becomes larger with increasing thickness, elasticity modulus, and Poisson’s ratio of the topcoat. Finally, two integral parameters are proposed to represent the stress state near the free edge related to mode I and II fracture, respectively. The parameters, not sensitive to the grid density, are validated by experiments.

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Section: Introductionmentioning

confidence: 99%

Simulations of Effects of Geometric and Material Parameters on the Interfacial Stress of the Thermal Barrier Coatings with Free Edges

et al. 2023

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“…The α‐Al 2 O 3 film has good oxygen barrier properties and low growth rate, which can effectively prevent the BC from further oxidization and the prolonged lifespan of TBCs and is an ideal TGO constituent. Based on the structural constants of coating thickness and porosity, Kim et al 10 . proposed a predictive model that can predict the growth behavior of TGO, and the error between the predicted TGO thickness value and the measured value of the model is within 12%.…”

Section: Introductionmentioning

confidence: 99%

“…The α-Al 2 O 3 film has good oxygen barrier properties and low growth rate, which can effectively prevent the BC from further oxidization and the prolonged lifespan of TBCs and is an ideal TGO constituent. Based on the structural constants of coating thickness and porosity, Kim et al 10 proposed a predictive model that can predict the growth behavior of TGO, and the error between the predicted TGO thickness value and the measured value of the model is within 12%. Chen et al 11 used the micro-cantilever bending technique to test the mechanical properties of TGO with α-Al 2 O 3 as the main component, which provided a research basis for the evolution of the mechanical properties of TGO under high-temperature thermal cycling.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of TGO thickness on stress distribution and evolution of 8YSZ thermal barrier coatings

Zheng

Lin

et al. 2022

J Am Ceram Soc.

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According to the experimental research results of the thermally grown oxide (TGO) layered growth during the pre‐oxidation process of 8 wt.% yttria‐stabilized zirconia thermal barrier coating (TBC), a two‐dimensional sinusoidal TC/bonding coat (BC) curve interface model of the longitudinal section of TBCs based on finite element simulation was constructed; the thickness and composition of the TGO layer relative to the TC/BC curve interfacial stress distribution and its evolution during the thermal cycling process were studied. The results show that when the TGO layer uses α‐Al2O3 as the main oxide (black TGO), the thicker the black TGO layer, the more uniform the stress distribution of the TC/BC interface. When the TGO layer is dominated by spinel‐structured Co and Cr oxides (gray TGO), the stress “band” of the TC/BC interface is destroyed; it shows the alternating phenomenon of tensile stress zone and compressive stress zone, and after the rapid random growth of TGO, the concentrated tensile stress increased by a large jump. Affected by the thickness of the prefabricated black TGO layer, there is a limit peak in the thickness of the black TGO layer, the normal stress at the TC/BC boundary is minimized, and the magnitude of the stress change is also minimized.

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Damage of Thermal Barrier Coated Superalloy Under Thermal Gradient Mechanical Fatigue

Zhan,

Wang,

Xie

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Prediction of growth behavior of thermally grown oxide considering the microstructure characteristics of the top coating

Cited by 11 publications

References 27 publications

Simulations of Effects of Geometric and Material Parameters on the Interfacial Stress of the Thermal Barrier Coatings with Free Edges

Simulations of Effects of Geometric and Material Parameters on the Interfacial Stress of the Thermal Barrier Coatings with Free Edges

Finite element analysis of TGO thickness on stress distribution and evolution of 8YSZ thermal barrier coatings

Damage of Thermal Barrier Coated Superalloy Under Thermal Gradient Mechanical Fatigue

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