A chemo-thermo-mechanically constitutive theory for thermal barrier coatings under CMAS infiltration and corrosion

Xu, Guangnan; Yang, Li; Zhou, Yue; Pi, Z.P.; Zhu, Wang

doi:10.1016/j.jmps.2019.103710

Cited by 50 publications

(16 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(a), the elements of CMAS concentrate on the top layer of TBC, and these element distribution maps indicate that the area is corroded by CMAS. Many studies have proved that the reaction of CMAS and TBC happened in the corroded zone [23,24,26,33]. Therefore, in this paper, the corroded zone of TBC is defined as the reaction layer.…”

Section: Generation Of the Reaction Layermentioning

confidence: 99%

“…The results proved that molten CMAS dissolutes the YSZ coating at elevated temperatures, and then upon saturation, re-precipitation of several crystalline phases closer to equilibrium with the melt, which is the primary mechanism of interaction among corrosion process, resulting in the generation of reaction layer or corrosion area. The mechanism of buckling of APS TBC under CMAS attack was particularly elucidated [24,25] . Firstly, CMAS becomes soft (around 764 ) ℃ and molten (around 1250 ), and infiltrates into ℃ pre-existing cracks and pores due to the capillary force drives.…”

Section: Introduction mentioning

confidence: 99%

“…However, the distribution and evolution of stress of TBCs under CMAS attack is also crucial at high temperatures. Xu et al [24] established constitutive equations for TBCs under CMAS infiltration and corrosion. Similarly, they observed the bending of free-standing TBC at high temperatures and defined a specific parameter named coefficient of corrosion expansion to describe the volume expansion of coating under CMAS attack.…”

Section: Introduction mentioning

confidence: 99%

See 2 more Smart Citations

Experimental and numerical investigation on the thermal and mechanical behaviours of thermal barrier coatings exposed to CMAS corrosion

Jiang

Gao³

et al. 2021

J Adv Ceram

View full text Add to dashboard Cite

Calcium-magnesium-alumino-silicate (CMAS) corrosion is a critical factor which causes the failure of thermal barrier coating (TBC). CMAS attack significantly alters the temperature and stress fields in TBC, resulting in their delamination or spallation. In this work, the evolution process of TBC prepared by suspension plasma spraying (SPS) under CMAS attack is investigated. The CMAS corrosion leads to the formation of the reaction layer and subsequent bending of TBC. Based on the observations, a corrosion model is proposed to describe the generation and evolution of the reaction layer and bending of TBC. Then, numerical simulations are performed to investigate the corrosion process of free-standing TBC and the complete TBC system under CMAS attack. The corrosion model constructs a bridge for connecting two numerical models. The results show that the CMAS corrosion has a significant influence on the stress field, such as the peak stress, whereas it has little influence on the steady-state temperature field. The peak of stress increases with holding time, which increases the risk of the rupture of TBC. The Mises stress increases nonlinearly along the thick direction of the reaction layer. Furthermore, in the traditional failure zone, such as the interface of the top coat and bond coat, the stress obviously changes during CMAS corrosion.

show abstract

Section: Generation Of the Reaction Layermentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical investigation on the thermal and mechanical behaviours of thermal barrier coatings exposed to CMAS corrosion

Jiang

Gao³

et al. 2021

J Adv Ceram

View full text Add to dashboard Cite

show abstract

“…2(a), the elements of CMAS concentrates on the top layer of TBC, and these element distribution maps indicate the area of CMAS infiltration. Researches proved that the reaction of CMAS and TBC happened in the area of infiltration [23,24,27]. Therefore, the top layer is defined as the reaction layer.…”

Section: The Generation Of the Reaction Layermentioning

confidence: 99%

“…Shan et al [24,25] particularly elucidated the mechanism of buckling of APS TBC under CMAS attack. Firstly, CMAS becomes soft (around 764 °C) and melt (around 1250 °C), and infiltrates into pre-existing cracks and pores due to the capillary force drives.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Thermal and Mechanical Behaviours of Thermal Barrier coatings Exposed to CMAS Corrosion

Li¹,

Jiang

Gao

et al. 2020

Preprint

View full text Add to dashboard Cite

Calcium-magnesium-alumino-silicate (CMAS) corrosion is one of the most critical failure mechanisms of thermal barrier coating (TBC). CMAS attack significantly alters the temperature and stress fields in TBCs, resulting in their delamination or spallation. In this work, the dynamic evolution process of suspension plasma sprayed (SPS) TBC under CMAS attack is investigated. The CMAS corrosion leads to the formation of reaction layer and subsequent bending of TBC. Based on the observations, a corrosion model is proposed to describe the generation and evolution of the reaction layer and bending of TBC. Then, numerical simulations are performed to investigate the corrosion process of free-standing TBC and the complete TBC system under CMAS attack, respectively. Results show that the CMAS corrosion has a significant influence on the stress field, such as the peak stress, while it has little influence on the steady state temperature field. It should be noted that the peak of stress increases with holding time which increases the risk of the rupture of TBC. There is a parabolic relationship between the stress and reaction layer thickness in the holding stage. Furthermore, in the traditional failure zone, such as the interface of top coat and bond coat, the stress obviously change during CMAS corrosion.

show abstract

Introduction

Zhou

Yang

Zhu

2022

Thermal Barrier Coatings: Failure Theory and Evaluation Technology

View full text Add to dashboard Cite

A chemo-thermo-mechanically constitutive theory for thermal barrier coatings under CMAS infiltration and corrosion

Cited by 50 publications

References 37 publications

Experimental and numerical investigation on the thermal and mechanical behaviours of thermal barrier coatings exposed to CMAS corrosion

Experimental and numerical investigation on the thermal and mechanical behaviours of thermal barrier coatings exposed to CMAS corrosion

Experimental and Numerical Investigation on the Thermal and Mechanical Behaviours of Thermal Barrier coatings Exposed to CMAS Corrosion

Introduction

Contact Info

Product

Resources

About