Modeling of thermal properties and failure of thermal barrier coatings with the use of finite element methods: A review

Wang, Li; Li, D.C.; Yang, Jianli; Shao, Fang; Zhong, Xinghua; Zhao, Hao; Yang, Kai; Tao, Shunyan; Wang, Yihuan

doi:10.1016/j.jeurceramsoc.2015.12.038

Cited by 142 publications

(34 citation statements)

References 140 publications

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“…The quantitative effect of grain boundaries on the thermal conductivity was analyzed, showing that the thermal conductivity of small grains is lower than that of large grains [16][17][18]. Unfortunately, most studies have focused on the qualitative effect of microstructure on the thermal conductivity in the thermal barrier coating [19][20][21]. Nevertheless, very limited literature on the quantitative relationship between the microstructure and thermal conductivity is available.…”

Section: Materials and Preparationmentioning

confidence: 99%

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Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

Khan

Wang

et al. 2017

Coatings

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Abstract:In this paper, the effect of microstructure on the thermal conductivity of plasma-sprayed Y 2 O 3 stabilized ZrO 2 (YSZ) thermal barrier coatings (TBCs) is investigated. Nine freestanding samples deposited on aluminum alloys are studied. Cross-section morphology such as pores, cracks, m-phase content, grain boundary density of the coated samples are examined by scanning electron microscopy (SEM) and electron back-scattered diffraction (EBSD). Multiple linear regressions are used to develop quantitative models that describe the relationship between the particle parameters, m-phase content and features of the microstructure such as porosity, crack-porosity, and the length density of small and big angle-cracks. Moreover, the relationship between the microstructure and thermal conductivity is investigated. Results reveal that the thermal conductivity of the coating is mainly determined by the microstructure and grain boundary density at room temperature (25 • C), and by the length density of big-angle-crack, monoclinic phase content and grain boundary density at high temperature (1200 • C).

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Section: Materials and Preparationmentioning

confidence: 99%

“…Unfortunately, most studies have focused on the qualitative effect of microstructure on the thermal conductivity in the thermal barrier coating [19][20][21]. Nevertheless, very limited literature on the quantitative relationship between the microstructure and thermal conductivity is available.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

Khan

Wang

et al. 2017

Coatings

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“…In order to increase the reliability and durability of TBCs, substantial effort has been devoted to understand the failure mechanisms of TBCs in the past decades . Among the various life‐limiting factors, the attack of TBCs by calcium‐magnesium‐alumino‐silicate (CMAS) deposits is becoming a critical issue in advanced gas turbines due to the increased inlet temperatures .…”

Section: Introductionmentioning

confidence: 99%

Failure of plasma sprayed nano‐zirconia‐based thermal barrier coatings exposed to molten CaO–MgO–Al₂O₃–SiO₂ deposits

et al. 2019

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Recently, nanostructured thermal barrier coatings have received considerable attention because of some superior properties in comparison with their conventional counterpart. In this study, nanostructured 8 wt% yttria‐stabilized zirconia (n‐YSZ) coatings were deposited by atmospheric plasma spraying, and the degradation behavior caused by molten calcium‐magnesium‐aluminon‐silicate (CMAS) attack was investigated. Results showed that the thermo‐chemical reaction product between CMAS and YSZ (both powders and coatings) is different with the change of CMAS content. At low CMAS concentration, a cubic phase is generated by the diffusion of Ca into YSZ grains. As compared to the conventional YSZ, less C‐ZrO2 is detected for n‐YSZ. When CMAS reaches a certain concentration (eg 15 mg/cm2), disruptive phase transformation from tetragonal to monoclinic will occur and the reaction is more readily for n‐YSZ. Two different chemical reaction mechanisms governing the CMAS content effect were proposed. It should be noted that the nanozone in the coatings plays an important role in the CMAS degradation process, which enhances CMAS infiltration rate and accelerates the chemical reaction, leading to a poor CMAS resistance of the nanostructured coating than that of the conventional counterpart.

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“…Cracks often initiate and grow in the coatings or at the interfaces between different layers due to the stresses produced in service [5][6][7]. Such cracks accelerate the premature failure in adhesion of coatings, which have limited the reliabilities and durability of TBCs [8][9][10][11]. Therefore, it is important to have a good understanding on their failure mechanism.…”

Section: Introductionmentioning

confidence: 99%

Competition mechanism of interfacial cracks in thermal barrier coating system

et al. 2017

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Abstract:The mechanism of competition between different interfacial cracks is investigated, specifically considering the cracks at top-coat/bond-coat and bond-coat/substrate interfaces in a thermal barrier coating system (TBCs). To assess the cracking process driven by mechanical loading, in-situ three-point bending tests were conducted on TBCs samples having different top coats (TC) and bond coats (BC). The competition between cracks at TC/BC and BC/substrate interfaces was observed for the first time, and then analyzed to elucidate the mechanism. Experimental and numerical results show that the differences in modulus ratio and thickness ratio of TC to BC are the main factors controlling the competition, which eventually leads to different fracture modes, i.e. when TC thickness is large or BC modulus is low, the coatings peel off from the TC/BC interface; while, with the decreasing TC thickness or increasing BC modulus, the delamination location changes to BC/substrate interface. A failure map based on the two ratios is numerically established, which agrees well with the experimental results. It is advised that the crack propagation path can be controlled by adjusting the combination of the two ratios to trigger both TC/BC and BC/substrate interfacial cracks in TBCs, thereby leading to more energy dissipation and better bending-resistance.

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Modeling of thermal properties and failure of thermal barrier coatings with the use of finite element methods: A review

Cited by 142 publications

References 140 publications

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

Failure of plasma sprayed nano‐zirconia‐based thermal barrier coatings exposed to molten CaO–MgO–Al₂O₃–SiO₂ deposits

Competition mechanism of interfacial cracks in thermal barrier coating system

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Modeling of thermal properties and failure of thermal barrier coatings with the use of finite element methods: A review

Cited by 142 publications

References 140 publications

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

Failure of plasma sprayed nano‐zirconia‐based thermal barrier coatings exposed to molten CaO–MgO–Al2O3–SiO2 deposits

Competition mechanism of interfacial cracks in thermal barrier coating system

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Failure of plasma sprayed nano‐zirconia‐based thermal barrier coatings exposed to molten CaO–MgO–Al₂O₃–SiO₂ deposits