Numerical analysis of the influence of pore microstructure on thermal conductivity and Young's modulus of thermal barrier coating

Sun, Fan; Fan, Xiang; Zhang, Tao; Jiang, Peng; Yang, Jingjing

doi:10.1016/j.ceramint.2020.06.214

Cited by 55 publications

(13 citation statements)

References 34 publications

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“…Given the stiffened mechanism due to the infiltration of CMAS, the effective Young's modulus of the topcoat significantly increased from 40 to 175 GPa (noninfiltration to infiltration), as listed in Table 1. Notably, the effective Young's modulus of the CMAS-rich layer is similar to the value evaluated via object-oriented finite elements [31]. Jackson et al [27] also indicated that the effective modulus of the CMAS-rich layer increases to 180 GPa when the silicates crystallize and stiffen.…”

Section: Materials Propertiessupporting

confidence: 57%

Experimental and Simulation Analysis of the Evolution of Residual Stress Due to Expansion via CMAS Infiltration in Thermal Barrier Coatings

Tseng

Chao

et al. 2021

Coatings

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The failure behavior of thermal barrier coatings (TBCs) involves multilayered systems infiltrated with calcium–magnesium–alumino-silicates (CMAS). The metastable tetragonal phase is mainly composed of 7YSZ (7 mol.% Y2O3-stabilized ZrO2), and it destabilizes into the Y-lean tetragonal phase, which may be induced by CMAS infiltration, and transforms into a monoclinic phase during cooling. The phase transformation leads to volume expansion around the CMAS-rich layer. Furthermore, it is shown that the spalling of the coating system emerges when the surface of the coating system is subjected to significant residual stress. In this study, a double-cantilever beam model is established to describe the macroscopic phenomenon of thermal buckling induced via CMAS. The result of the buckle height is used to demonstrate the consistency of the experiment and finite element simulation. The experimental parameters are imported into a multilayer cantilever beam model to analyze the interfacial stresses due to CMAS infiltration. The finite element results indicate that the phase transformation leads to damage in the coating system wherein the interfacial stresses due to phase transformation are 27% higher than those in the model without phase transformation.

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Section: Materials Propertiessupporting

confidence: 57%

Experimental and Simulation Analysis of the Evolution of Residual Stress Due to Expansion via CMAS Infiltration in Thermal Barrier Coatings

Tseng

Chao

et al. 2021

Coatings

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“…The results predict that the bridge area is the microstructural parameter with the greatest impact on the conductivity. Several factors play significant roles in determining the thermal conductivity, such as pore size, pore distribution, and crack orientation [73][74][75][76][77][78][79][80][81]. Wei et al [82] developed an analytical model to discuss the effects of the microstructural parameters, including splat thickness, bonding ratio between splits, and unit size, on the total thermal resistance and to reveal the dominant effect of oriented 2D pores on heat flux (Figure 11) [72,82,83].…”

Section: Materials and Structure Of Top Coatsmentioning

confidence: 99%

“…However, at the service temperature, the radiation heat transfer caused by the pores cannot be ignored [84][85][86][87][88]. Numerous studies have shown that pores parallel to the direction of the substrate can drastically reduce the thermal conductivity [41,62,67,73,[89][90][91]. Boissonnet et al [92] prepared a series of TBCs with different thicknesses by PS and high-velocity oxygen-fuel spraying (Figure 12).…”

Section: Materials and Structure Of Top Coatsmentioning

confidence: 99%

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

et al. 2023

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Thermal barrier coatings (TBCs) are a fundamental technology used in high-temperature applications to protect superalloy substrate components. However, extreme high-temperature environments present many challenges for TBCs, such as the degradation of their thermal and mechanical properties. Hence, highly insulating, long-life TBCs must be developed to meet higher industrial efficiency. This paper reviews the main factors influencing the thermal insulation performance of TBCs, such as material, coating thickness, and structure. The heat transfer mechanism of the coating is summarized, and the degradation mechanism of the thermal insulation is analyzed from the perspective of the coating structure. Finally, the recent advances in improving the thermal insulation and lifetime of coatings are reviewed in terms of advanced materials and structural design, which will benefit advanced TBCs in future engineering applications and provide guidance for the next generation of high thermal insulating TBCs.

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“…Experiments, analytical, and numerical analyses are the primary approaches to evaluate the properties of rock mass, 5–7 which provide valuable information for various engineering projects. In experimental methods, rock hydraulic, and thermal properties are usually measured by Darcy's experiments, 8 in‐situ permeability measurement, 9 heat flow meter‐based methods, 10 simple hot box‐heat flow meter‐based methods 11 and in‐situ measurement without heat flow meter methods 12 .…”

Section: Introductionmentioning

confidence: 99%

DRPCTS: A digital computation theory framework system for rock property parameters using micro‐CT images

Zhao

Zhou

2021

Num Anal Meth Geomechanics

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Rock properties evaluations play decisive roles in various geotechnical engineering programs. This work aims at establishing a digital rock parameters computation theory framework system (DRPCTS) to rapidly and accurately obtain the common pore‐scale, hydraulic, and thermophysical variables by micro‐CT images. The proposed package contains the codes for the pore‐scale, hydraulic, and thermophysical variables expressions defined by the digital analysis techniques. Some experimental rock properties datasets are given to validate the accuracy of DRPCTS. The DRPCTS package provides excellent tools to rapidly obtain the common rock properties parameters only using some micro‐CT datasets as the input parameters with simple implementations.

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Numerical analysis of the influence of pore microstructure on thermal conductivity and Young's modulus of thermal barrier coating

Cited by 55 publications

References 34 publications

Experimental and Simulation Analysis of the Evolution of Residual Stress Due to Expansion via CMAS Infiltration in Thermal Barrier Coatings

Experimental and Simulation Analysis of the Evolution of Residual Stress Due to Expansion via CMAS Infiltration in Thermal Barrier Coatings

Multi-Scale Structural Design and Advanced Materials for Thermal Barrier Coatings with High Thermal Insulation: A Review

DRPCTS: A digital computation theory framework system for rock property parameters using micro‐CT images

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