Optimization selection of the thermal conductivity of the top ceramic layer in the Double-Ceramic-Layer Thermal Barrier Coatings based on the finite element analysis of thermal insulation

Han, Meng; Zhou, Guodong; Huang, Jihua; Chen, Shuhai

doi:10.1016/j.surfcoat.2013.12.047

Cited by 22 publications

(10 citation statements)

References 28 publications

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“…Precursors are dissolved and mixed at the molecular level, which enhances homogeneity. However, the reagents are often more expensive; therefore, these methods are preferred when there is high homogeneity but a large amount of material are needed [5][6][7][8]. The starting materials were zirconium oxychloride (ZrOCl2Á8H2O, 99.99%) and yttrium nitrate (Y(NO 3 ) 3 Á6H 2 O).…”

Section: Methodsmentioning

confidence: 99%

“…The function of the top-coat is to decrease the temperature to at least 300°C, under the assumption that the thickness of the ceramic insulation is generally no higher than 300 lm. This assumption requires the knowledge of the thermal properties of the ceramic materials used in TBC deposition, especially the thermal conductivity or diffusivity in a wide temperature range [3][4][5]. Thermal conductivity and diffusivity are important in the numerical modeling of the temperature and the stress distribution in the ceramic layer.…”

Section: Introductionmentioning

confidence: 99%

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Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems

Moskal

Mikuśkiewicz

Jasik

2019

J Therm Anal Calorim

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The basic goal of this article was thermal diffusivity characterization of ceramic materials used in thermal barrier coating (TBC) systems for depositions of the insulation layer and characterization of the materials' morphology and remanufacturing process. The base material was oxide 8YSZ (ZrO 2 9 8Y 2 O 3), which is usually dedicated to deposition of an insulating top layer in TBC systems. The data related to thermal properties such as thermal diffusivity and thermal conductivity are widely presented in the literature, but there is lack of information about the morphological form of investigated materials, and the presented results vary widely. Data on thermal properties based on the literature sources are inadequate for the real morphological form of materials used in the experiment (e.g., massive or single crystalline material vs. plasma-sprayed coatings), which consequently gives an unsatisfactory accuracy of the obtained numerical simulations by MES methods. This article presents the characterization of thermal diffusivity of the commercial 8YSZ ceramic material synthesized or remanufactured by different routes, which is investigated in the forms of pressed powder pellet (two commercial nano-sized powders with different morphologies), sintered pellets (one commercial powder, solid-state co-precipitated reacted powder of 8YSZ type), and a two-layered coating system of In625 ? NiCrAlY/8YSZ type. The range of analysis included morphological investigations of different types of powders in initial conditions and after remanufacturing (sintering, thermal spraying) as well as the thermal diffusivity analysis by the laser flash method. The obtained data were corrected by porosity factor and compared to each other. The best similarity for obtained thermal diffusivity data was found for commercial powers of HOSP TM type after pressing and sintering processes and calculated (2layered model) value of thermal diffusivity for two-layered system of In625/8YSZ TBS system. The results showed that there are significant differences in thermal diffusivity values for materials with different morphological forms.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems

Moskal

Mikuśkiewicz

Jasik

2019

J Therm Anal Calorim

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“…The Zr 6 Ta 2 O 17 powder with a particle size of 15–45 μm was selected for spraying. In order to alleviate the difference in thermal expansion coefficient between the bond coating and the Zr 6 Ta 2 O 17 ceramic coating, Zr 6 Ta 2 O 17 /YSZ double ceramic top coatings were used 24,25 . The thicknesses of Zr 6 Ta 2 O 17 layer and YSZ layer were both 150 μm 25 .…”

Section: Methodsmentioning

confidence: 99%

“…In order to alleviate the difference in thermal expansion coefficient between the bond coating and the Zr 6 Ta 2 O 17 ceramic coating, Zr 6 Ta 2 O 17 /YSZ double ceramic top coatings were used 24,25 . The thicknesses of Zr 6 Ta 2 O 17 layer and YSZ layer were both 150 μm 25 . The NiCoCrAlY bond coating was deposited on the nickel‐based superalloy substrate by high‐speed velocity air‐fuel spraying (HVAF) (NMT‐1600, Kermetico).…”

Section: Methodsmentioning

confidence: 99%

Effects of Ta₂O₅ content on mechanical properties and high‐temperature performance of Zr₆Ta₂O₁₇ thermal barrier coatings

Liu

Zhu

et al. 2021

J Am Ceram Soc.

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Zr6Ta2O17/YSZ double ceramic top coat thermal barrier coatings (TBCs) with different Ta2O5 content are prepared by atmospheric plasma spraying (APS). The effects of Ta2O5 content on mechanical properties and high‐temperature performance of Zr6Ta2O17 TBCs are investigated. With the decrease in Ta2O5 content, the hardness and fracture toughness of the Zr6Ta2O17 coating increases from 12.833 to 15.117 GPa and from 3.3592 to 3.7753 MPa m1/2, respectively. The Zr6Ta2O17 coating specimens with different Ta2O5 content do not delaminate from the substrate except the edge peeling after 180 h of oxidation or 2000 thermal cycles at 1150°C. The Zr‐12Ta specimen (the molar ratio of ZrO2/Ta2O5 of 0.88:0.12) presents the more excellent mechanical properties and high‐temperature performance. The reduction in Ta2O5 content will improve the mechanical properties, high‐temperature oxidation, and thermal cycle performance of Zr6Ta2O17/YSZ double ceramic top coat TBCs.

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“…A 1:1 mesh was used, with mesh refinement near the layer interfaces to improve the calculation accuracy, with a grid size of 1e-6 m, as shown in Figure 2b,c. In recent studies, the thickness of the bond-coat layer was approximately 100~200 µm, and the thickness of the ceramic layer was approximately 100~400 µm [3,42,[45][46][47]. Therefore, 100-200 µm was selected as the bond-coat layer thickness of the model in this study, and the thickness of each ceramic layer was optimized in the range of 100~400 µm.…”

Section: Finite Element Simulation Modelmentioning

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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Optimization selection of the thermal conductivity of the top ceramic layer in the Double-Ceramic-Layer Thermal Barrier Coatings based on the finite element analysis of thermal insulation

Cited by 22 publications

References 28 publications

Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems

Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems

Effects of Ta₂O₅ content on mechanical properties and high‐temperature performance of Zr₆Ta₂O₁₇ thermal barrier coatings

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

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Optimization selection of the thermal conductivity of the top ceramic layer in the Double-Ceramic-Layer Thermal Barrier Coatings based on the finite element analysis of thermal insulation

Cited by 22 publications

References 28 publications

Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems

Thermal diffusivity measurement of ceramic materials used in spraying of TBC systems

Effects of Ta2O5 content on mechanical properties and high‐temperature performance of Zr6Ta2O17 thermal barrier coatings

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

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Effects of Ta₂O₅ content on mechanical properties and high‐temperature performance of Zr₆Ta₂O₁₇ thermal barrier coatings