Stress evolution in ceramic top coat of air plasma-sprayed thermal barrier coatings due to CMAS penetration under thermal cycle loading

Cai, Zhenwei; Hong, Hui; Peng, Di; Zhao, Xiaofeng; Wang, Weizhe; Cao, Zhaomin

doi:10.1016/j.surfcoat.2019.125146

Cited by 15 publications

(2 citation statements)

References 27 publications

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“…It was further surmised that for the crack located above the curved interface, an increase in the in-plane modulus can prevent the accumulation of strain energy, making delamination initiation difficult. Modelling studies by Cai et al [117] also support the top coat/bond coat interface playing as significant role in the evolution of stresses in CMAS infiltrated plasma-sprayed TBCs.…”

Section: Cmas Chemical Attack and Infiltration Mechanismsmentioning

confidence: 89%

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

Nieto

Agrawal

Bravo

et al. 2020

International Materials Reviews

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This review critically examines the current understanding of calcia-magnesia-aluminasilicate (CMAS) degradation mechanisms and mitigation approaches in thermal and environmental barrier coatings. First, the review introduces case studies of field returned engine components exposed to CMAS attack, followed by fundamental aspects of CMASinduced degradation. Understanding CMAS adhesion, infiltration, spallation mechanics, and thermochemical attack mechanisms is crucial to designing materials approaches to mitigate CMAS attack. CMAS mitigation strategies have focused on reactive approaches aimed at crystallising molten CMAS at the earliest stage possible to inhibit infiltration. Promising approaches are presented, starting with fundamental reaction kinetics studies, followed by the effects of microstructure in actual coatings systems. Salient results on coating systems tested in various burner rigs and a full engine test are presented to benchmark the success of various mitigation strategies. Lastly, several key future research areas are presented in order to provide a roadmap towards 'sandphobic' thermal and environmental barrier systems.

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Section: Cmas Chemical Attack and Infiltration Mechanismsmentioning

confidence: 89%

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

Nieto

Agrawal

Bravo

et al. 2020

International Materials Reviews

View full text Add to dashboard Cite

show abstract

“…Air plasma sprayed thermal barrier coatings (APS TBCs) are widely used in gas turbines as a critical thermal insulation component [1]. Nowadays, the penetration of environmental CaO-MgO-Al2O3-SiO2 (CMAS) is one of the most vital factors inducing the failure of APS TBCs [2][3][4]. The penetration of CMAS into the porous microstructures of the ceramic top coat (TC) of APS TBCs can cause substantial surface modification of this layer.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study about the Effect of Non-uniform CMAS Penetration on the TGO Growth and Interface Stress Behavior of APS TBCs

Cai

Zhang

Liu

et al. 2021

Preprint

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The penetration of calcium-magnesium-alumino-silicate (CMAS) is one of the most vital factors inducing the failure of air plasma sprayed thermal barrier coatings (APS TBCs). The CMAS penetration into the porous microstructures of TBCs changes the thermal/mechanical properties of top coat (TC) material, this brings about considerable thermal mismatch stress at the TC/bond coat (BC) interface, and accelerates the growth of the thermally grown oxide (TGO), finally leading to more complicated stress state at the interface. In present study, a two-dimensional global model of APS TBCs with half of the TC penetrated by CMAS is built to study effect of non-uniform CMAS penetration. Then, a local model extracted from the global are built to investigate the effect of interface morphologies and CMAS penetration depth. The results showed that non-uniform CMAS penetration in APS TBCs causes non-uniform TGO growth, which further leads to more complicated interface stress distribution. The CMAS penetration depth had a greater effect on the TC/TGO interface stress behavior, while the interface roughness had an more obvious influence on the stress level at BC/TGO interface under CMAS penetration.

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Overview of thermal barrier coatings for advanced gas turbine engine

Guo

Zhang

et al. 2023

Thermal Barrier Coatings

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Stress evolution in ceramic top coat of air plasma-sprayed thermal barrier coatings due to CMAS penetration under thermal cycle loading

Cited by 15 publications

References 27 publications

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

A Numerical Study about the Effect of Non-uniform CMAS Penetration on the TGO Growth and Interface Stress Behavior of APS TBCs

Overview of thermal barrier coatings for advanced gas turbine engine

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