Thermophysical properties of thick thermal barrier coatings

Schwingel, Dirk; Taylor, R. J.; Wigren, J.

doi:10.1068/htec300

Cited by 7 publications

(6 citation statements)

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“…It is also evident that the HOSP coatings generally have a lower conductivity as compared with FC coatings, which could be attributed to the higher density of the interlamellar interfaces. Some irreversible microstructure change took place during high‐temperature exposure 22,23 . In particular, a reduction of the crack‐like micro‐porosity was observed because of the densification processes, typically caused by sintering.…”

Section: Resultsmentioning

confidence: 99%

“…Some irreversible microstructure change took place during high-temperature exposure. 22,23 In particular, a reduction of the crack-like micro-porosity was observed because of the densification processes, typically caused by sintering. These could be considered as the main mechanisms responsible for the increase in thermal conductivity.…”

Section: (2) In-flight Particle Diagnosticsmentioning

confidence: 99%

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Microstructures and Properties of Plasma‐Sprayed Segmented Thermal Barrier Coatings

Guo

Katayama

Murakami

2006

Journal of the American Ceramic Society

122

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Thermal barrier coatings (TBCs) with different levels of segmentation crack density were produced by spraying two types of ZrO2–8Y2O3 powders. The fused and crushed powder has a greater capability of forming segmented coatings than the hollow sphere (HOSP) one. The highly segmented coatings reveal much lower porosity compared with traditionally sprayed coatings, thereby compromising the property of thermal insulation of TBCs. Microstructure and thermal conductivity of the HOSP coatings are more sensitive to the changes in spray conditions. Segmentation cracks had a strong influence in decreasing Young's modulus of coatings. Fifty hours heat treatment at 1250°C had little effect on the mechanical property of the highly segmented coatings.

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Section: Resultsmentioning

confidence: 99%

Section: (2) In-flight Particle Diagnosticsmentioning

confidence: 99%

Microstructures and Properties of Plasma‐Sprayed Segmented Thermal Barrier Coatings

Guo

Katayama

Murakami

2006

Journal of the American Ceramic Society

122

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“…However, it is established that the Young's modulus decreases with increasing density of segmentations ( Fig. 3a) [10,15,19,21]. For an as-sprayed coating, literature reports typical values in the range of 5-60 GPa for a global measurement technique, giving apparent Young's modulus, higher in compression than in tension.…”

Section: Properties Of Aps Tbcmentioning

confidence: 94%

“…On the other hand, our research is focused on dense, vertically segmented or cracked (DVC) microstructure, characteristic of hot spraying and thick coating (1 mm) [3,[12][13][14][15][16][17][18][19][20][21]. The most important difference with the standard APS coating is the global columnar structure ( Fig.…”

Section: Process and Coatings Microstructurementioning

confidence: 99%

Mechanical and Thermo-physical Properties of Plasma-Sprayed Thermal Barrier Coatings: A Literature Survey

et al. 2017

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Proton, Fabrice Crabos, et al.. Mechanical and thermo-physical properties of plasma-sprayed thermal barrier coatings: a literature survey.OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.Abstract Atmospheric plasma-sprayed thermal barrier coatings (APS TBCs) have been studied from an extensive review of the dedicated literature. A large number of data have been collected and compared, versus deposition parameters and/or measurement methods, and a comparison was made between two different microstructures: standard APS coatings and segmented coatings. Discussion is focused on the large scattering of results reported in the literature even for a given fabrication procedure. This scattering strongly depends on the methods of measurement as expected, but also-for a given method-on the specific conditions implemented for the considered experimental investigation. Despite the important scattering, general trends for the correlation of properties to microstructure and process parameters can be derived. The failure modes of TBC systems were approached through the evolution of cracking and spalling at various life fractions.

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“…Similar results have been observed by other researchers. 4,18,19 The numerical model developed by Clyne and coworkers 10,11,13,20,21 was used to calculate the stresses in the top coat and get further insight into other possible mechanisms for the generation of the segmentation and branching cracks. The measured thermal history was compared to that obtained using the numerical model.…”

Section: Resultsmentioning

confidence: 99%

Effect of substrate temperature on the microstructure and properties of thick plasma-sprayed YSZ TBCs

Tsipas

Golosnoy

2011

Journal of the European Ceramic Society

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Thick (∼1.2 mm) thermal barrier coatings (TBCs) consisting of YSZ were deposited by plasma spraying. Spraying parameters were varied in a controlled manner to produce different microstructures. The effect of substrate temperature on the microstructural features and subsequently on the Young's modulus was investigated. In addition, the residual stresses in the coatings were estimated using a numerical model and they were related to the microstructural features observed. Results showed that crack segmentation density, residual stresses in the coatings and thus coating properties are strongly affected not only by the average substrate temperature during spraying but also the variations between the minimum and maximum substrate temperature.

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Thermophysical properties of thick thermal barrier coatings

Cited by 7 publications

References 0 publications

Microstructures and Properties of Plasma‐Sprayed Segmented Thermal Barrier Coatings

Microstructures and Properties of Plasma‐Sprayed Segmented Thermal Barrier Coatings

Mechanical and Thermo-physical Properties of Plasma-Sprayed Thermal Barrier Coatings: A Literature Survey

Effect of substrate temperature on the microstructure and properties of thick plasma-sprayed YSZ TBCs

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