Cyclic-Oxidation Behavior of Thermal-barrier Coatings Exposed to NaCl Vapor

Zhou, Chungen; Song, Yingxue; Wang, Changliang; Xu, Huibin

doi:10.1007/s11085-007-9088-4

Cited by 10 publications

(2 citation statements)

References 16 publications

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“…Figure 3b shows that the left boundary was set using symmetric boundary conditions to restrict displacement in the x-direction, and the bottom boundary restricts the displacement in the y-direction. The material properties of the 8YSZ top-coat, NiCoCrAlY bond-coat and substrate as functions of temperature are listed in Tables 2-4 [11,[16][17][18][19][20][21], respectively. In the calculation, the initial temperature of the substrate was assumed to be at room temperature, the process of coating droplets impacted and spread on the substrate at the melting point temperature, and the first step of the transient solution was carried out.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Effect of Top-Coat Thickness and Interface Fluctuation on the Residual Stress in APS-TBCs

Zhao,

Hu,

Wang

et al. 2023

Coatings

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This study focused on the numerical simulation of the distribution of residual stress in yttria-stabilized zirconia (YSZ) coatings prepared with atmospheric plasma spraying (APS). We particularly investigated the stress distribution around the interface between the top coat and bond coat. During thermal spray deposition, droplets and particles deposit on the substrate in a complex manner, causing interface waviness and non-uniform stress distribution. Therefore, residual stress is an important consideration when preparing thermal barrier coatings (TBCs). Residual stresses directly affect the performance of bond coats (BCs) and ceramic top coats (TCs). To accurately evaluate residual stress, we considered interface waviness and the thickness of the ceramic top coat and conducted a detailed analysis of stress distribution. The results show that compressive stress exists at the TC/BC interface, which may be caused by the mismatch in the thermal expansion coefficient between the YSZ top coat and the substrate, potentially leading to coating delamination. Moreover, the residual stress at the TC/BC interface significantly increases with an increasing YSZ thickness. When the top-coat thickness exceeds 300 μm, stress concentration and failure of the coating are likely to occur. Meanwhile, the optimized thermal spray experiment results confirm that the residual stress at the BC/YSZ interface of the thermal barrier coating is tensile stress, with a maximum value of 155 MPa, which is consistent with the finite element calculation results. Furthermore, the failure modes of TBCs with rough interface conditions are discussed in detail. Our research provides important guidance for TBC design and optimizing their performance.

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Section: Boundary Conditionsmentioning

confidence: 99%

Effect of Top-Coat Thickness and Interface Fluctuation on the Residual Stress in APS-TBCs

Zhao,

Hu,

Wang

et al. 2023

Coatings

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show abstract

“…The material performance parameters of the GH3128, MCrAlY bond layer, 8YSZ, tantalate, Al 2 O 3 , and YAG used in this study are listed in Tables 1-6 [48][49][50][51][52][53][54]. The tantalate parameters were obtained by testing ZrO 1.5 -YO 1.5 -TaO 1.5 bulk samples prepared in the experiments.…”

Section: Materials Thermo-physical Performance Parametersmentioning

confidence: 99%

Optimization of the Thickness and Interface Structure of Al2O3-YAG/ZrO1.5-YO1.5-TaO1.5/8YSZ/NiCoCrAlY Multilayer Thermal Barrier Coatings: A Finite Element Simulation

Zhou

Cao

et al. 2022

Coatings

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Thermal barrier coatings (TBCs) prepared using the atmospheric plasma spraying method fail mainly due to coating delamination caused by thermal mismatch in the absence of high temperature assessment. In this study, the thickness optimization of multiple ceramic layers in a TBCs and the influence of the interface structure on the residual stress of the coating were investigated using a finite element simulation method. The results showed that varying the thickness of each layer of a TBCs with multiple ceramic layers affects the distribution and magnitude of the residual stress of the coating. Therefore, a reasonable range of thickness for each layer can be determined. The thickness of the bonding layer should be 110 μm, the thickness of YSZ layer should be about 270 μm, the thickness of tantalate layer should be about 70 μm, and the thickness of Al2O3-YAG layer should be about 100 μm. Simultaneously, the results show that a rough interface can be more effective in reducing the relief of stress concentrations compared to a smooth interface, but the stress values increase.

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The mechanism of oxide whisker growth and hot corrosion of hot-dipped Al–Si coated 430 stainless steels in air–NaCl(g) atmosphere

Liu¹,

Cheng²,

Wang³

2011

Applied Surface Science

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Cyclic-Oxidation Behavior of Thermal-barrier Coatings Exposed to NaCl Vapor

Cited by 10 publications

References 16 publications

Effect of Top-Coat Thickness and Interface Fluctuation on the Residual Stress in APS-TBCs

Effect of Top-Coat Thickness and Interface Fluctuation on the Residual Stress in APS-TBCs

Optimization of the Thickness and Interface Structure of Al2O3-YAG/ZrO1.5-YO1.5-TaO1.5/8YSZ/NiCoCrAlY Multilayer Thermal Barrier Coatings: A Finite Element Simulation

The mechanism of oxide whisker growth and hot corrosion of hot-dipped Al–Si coated 430 stainless steels in air–NaCl(g) atmosphere

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