Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments

Manero, Albert; Selimov, Alex; Fouliard, Quentin; Knipe, Kevin; Wischek, Janine; Meid, Carla; Karlsson, Anette M.; Bartsch, Marion; Raghavan, Seetha

doi:10.1016/j.surfcoat.2016.09.057

Cited by 28 publications

(17 citation statements)

References 44 publications

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“…The objective magnitude was selected to be 10 × to ensure a laser beam spot size much larger than the grain size of TGO 41 . The laser was focused on the TBCs sample surface, and the previous study 39 confirmed an insignificant influence of the depth of focus. An in‐plane area of 3 mm × 3 mm was measured point‐by‐point by moving the focused laser beam to generate a residual stress map.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the relationship between the peak shift and compressive stress was used to calculate the TGO residual stress, which is expressed in following Equation 41 :

ν_{s} ‐ ν_{0} = {normalΠ}_{italicij} \times σ_{italicij},

where

ν_{S}

is the peak position for the stressed state,

ν_{0}

is the peak position for the stress‐free state,

Π_{ij}

is piezo‐spectroscopic coefficient (PSC), and

σ_{ij}

is the stress state in the crystallographic basis of the host crystal. As the TGO can be regarded as a thin film, the stress state is presumed to be biaxial (ie,

\bar{σ_{XX}} = \bar{σ_{YY}}, \bar{σ_{ZZ}} = 0

), and the biaxial residual stress

\bar{σ_{XX}}

\overset{σ_{italicYY}}{true}

can be finally determined as 41

ν_{s} ‐ ν_{0} = \frac{2}{3} false(Π_{11} + Π_{22} + Π_{33} false) \times σ_{italicxx}

Herein, PSC values of 7.59 cm −1 /GPa and 7.61 cm −1 /GPa for R1 and R2, respectively, were used according to Manero et al 39 …”

Section: Methodsmentioning

confidence: 99%

“…Instead of direct detection of delamination, the interfacial stress relaxation due to delamination can be used as an indicator of delamination and thus the nondestructive measurement of stress state at the interface is not only useful for stress analysis but also promising as an effective indirect approach for delamination detection 34‐39 . It is well known that TGO is subjected to high compressive residual stresses when the TC/TGO interface is intact (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Using the PLPS method, Heeg et al 36 experimentally identified the TGO behavior under thermal cycling throughout its lifetime toward eventual failure. Fukuchi et al 38 and Manero et al 39 focused on the high‐resolution spatial mapping of the stress in TGO, which provides a better understanding of the mechanisms leading to failure. However, most of them are not applicable to APS TBCs.…”

Section: Introductionmentioning

confidence: 99%

“…[31][32][33] Instead of direct detection of delamination, the interfacial stress relaxation due to delamination can be used as an indicator of delamination and thus the nondestructive measurement of stress state at the interface is not only useful for stress analysis but also promising as an effective indirect approach for delamination detection. [34][35][36][37][38][39] It is well known that TGO is subjected to high compressive residual stresses when the TC/TGO interface is intact (Figure 1). However, after longtime high-temperature exposure, TGO thickness increases and consequently delamination occurs and grows with time, accompanied by a significant decrease in the TGO residual stress ( Figure 1).…”

mentioning

confidence: 99%

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Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

et al. 2020

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There is a demand for more efficient and powerful gas turbines, which are characterized by higher operating temperatures, longer lifetimes, and other features. 1-3 This demand has led to great challenges in the development of advanced thermal protection technologies, among which thermal barrier coatings (TBCs) are regarded as one of those most promising to meet the demand. 4-8 Typically, TBCs consist of the following four layers 5,6 : (i) the superalloy substrate, which is the main load-bearing constituent; (ii) the ceramic top coat (TC), which is usually composed of 6-8 wt.% yttria-stabilized zirconia (YSZ) and acts as a temperature insulator; (iii) an aluminum-containing bond coat (BC) between the substrate and the TC, which is usually composed of MCrAlY (where M is Ni and/or Co) and used for alleviating the thermal expansion mismatch stress between the aforementioned two layers; and (iv) a thermally grown oxide (TGO), which forms between TC and BC when they are exposed to high temperature and provides oxidation resistance. Each of these constituent layers presents marked differences in physical, thermal, and mechanical properties, and all contribute to determine performance and durability. Typically, the TBCs are fabricated using either electron-beam physical vapor deposition

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Section: Methodsmentioning

confidence: 99%

“…Then, the relationship between the peak shift and compressive stress was used to calculate the TGO residual stress, which is expressed in following Equation 41 :

ν_{s} ‐ ν_{0} = {normalΠ}_{italicij} \times σ_{italicij},

where

ν_{S}

is the peak position for the stressed state,

ν_{0}

is the peak position for the stress‐free state,

Π_{ij}

is piezo‐spectroscopic coefficient (PSC), and

σ_{ij}

is the stress state in the crystallographic basis of the host crystal. As the TGO can be regarded as a thin film, the stress state is presumed to be biaxial (ie,

\bar{σ_{XX}} = \bar{σ_{YY}}, \bar{σ_{ZZ}} = 0

), and the biaxial residual stress

\bar{σ_{XX}}

\overset{σ_{italicYY}}{true}

can be finally determined as 41

ν_{s} ‐ ν_{0} = \frac{2}{3} false(Π_{11} + Π_{22} + Π_{33} false) \times σ_{italicxx}

Herein, PSC values of 7.59 cm −1 /GPa and 7.61 cm −1 /GPa for R1 and R2, respectively, were used according to Manero et al 39 …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

et al. 2020

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show abstract

Exploring the Regulatory Mechanism of ZnS Materials under Stress and Re Doping: Insights from Density Functional Theory

Dou,

Li,

Fang

et al. 2024

Advanced Photonics Research

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The application prospects of ZnS stress luminescent materials cover many fields such as high‐precision structural monitoring, smart materials, biomedical imaging, and new sensor technologies, which bring broad application prospects and significance to them in the fields of engineering, medicine, and scientific research. In this article, the electronic structure and optical properties of ZnS materials are successfully regulated by applying pressure and doping rare earth metals (Re), and it is found that the regulation of the luminescence properties of ZnS is the result of stress and doping interactions. Specifically, when pressure is applied or Re metal doping, the lattice structure is deformed and the atomic spacing is adjusted, which affects the electronic energy level distribution and optical properties of ZnS materials. Computational analysis of density functional theory (DFT) reveals the microscopic mechanisms behind these changes, including changes in lattice parameters, adjustment of bond length, and changes in band structure. This study provides theoretical guidance for the design and synthesis of high‐performance and high‐stability ZnS light‐emitting materials, and is of great significance for expanding the application of ZnS in the field of lasers and sensors.

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Local residual stress evolution of highly irregular thermally grown oxide layer in thermal barrier coatings

Jiang

Yang

Sun

et al. 2021

Ceramics International

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Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments

Cited by 28 publications

References 44 publications

Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

Nondestructive measurements of residual stress in air plasma‐sprayed thermal barrier coatings

Exploring the Regulatory Mechanism of ZnS Materials under Stress and Re Doping: Insights from Density Functional Theory

Local residual stress evolution of highly irregular thermally grown oxide layer in thermal barrier coatings

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