Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings

Mogro‐Campero, A.; Johnson, Curtis A.; Bednarczyk, P. J.; Dinwiddie, Ralph B.; Wang, H.

doi:10.1016/s0257-8972(97)00485-4

Cited by 14 publications

(8 citation statements)

References 6 publications

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“…Thermal conductivity normal to the coating was calculated from measurement of the density, specific heat and thermal diffusivity. Thermal diffusivity was measured at 18 • C using the laser flash method [29], using three laser shots per specimen.…”

Section: Experimental Verification Of the Modeling On Ysz Coatingsmentioning

confidence: 99%

Quantitative characterization of microstructures of plasma-sprayed coatings and their conductive and elastic properties

Sevostianov

Kachanov

Ruud

et al. 2004

Materials Science and Engineering: A

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Section: Experimental Verification Of the Modeling On Ysz Coatingsmentioning

confidence: 99%

Quantitative characterization of microstructures of plasma-sprayed coatings and their conductive and elastic properties

Sevostianov

Kachanov

Ruud

et al. 2004

Materials Science and Engineering: A

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“…This is mainly because the types of data presented in this study were a collection of many subsets over 12 years. A number of studies using data subsets ( Ref 5,6,9,[11][12][13][14] focused on the effects of microstructure, porosity, and other factors. Special focus of this study is placed on thermal diffusivity rather than thermal conductivity in which density/porosity of the TBCs would introduce a variable that could make data analysis more complicated.…”

Section: Resultsmentioning

confidence: 99%

Development of a Thermal Transport Database for Air Plasma Sprayed ZrO2-Y2O3 Thermal Barrier Coatings

2010

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Thermal diffusivities of air plasma sprayed (APS) thermal barrier coatings (TBCs) were measured by the laser flash method. The data were used to calculate thermal conductivity of TBCs when provided with density and specific heat data. Due to the complicated microstructure and other processing-related parameters, thermal diffusivity of TBCs can vary as much as three-to four-fold. Data collected from over 200 free-standing ZrO 2 -7-8wt.%Y 2 O 3 TBCs are presented. The large database gives a clear picture of the expected ''band'' of thermal diffusivity values. When this band is used as a reference for thermal diffusivity of a specific TBC, the thermal transport property of the TBC can be more precisely described. This database is intended to serve researchers and manufacturers of TBCs as a valuable resource for the evaluation of TBCs.

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“…below (Mogro-Campero et al 1997). It is also clear that the sintering of TBCs, which can occur under service conditions (Zhu & Miller 1998;Trice et al 2002;Tsipas et al 2004), raising both the inter-splat bridge area and the grain size (and hence the radiation penetration distance, d), can significantly increase the overall conductivity.…”

Section: Illustrative Case Historiesmentioning

confidence: 99%

Porous materials for thermal management under extreme conditions

Clyne

Golosnoy

Tan

et al. 2005

Phil. Trans. R. Soc. A.

116

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A brief analysis is presented of how heat transfer takes place in porous materials of various types. The emphasis is on materials able to withstand extremes of temperature, gas pressure, irradiation, etc., i.e. metals and ceramics, rather than polymers. A primary aim is commonly to maximize either the thermal resistance (i.e. provide insulation) or the rate of thermal equilibration between the material and a fluid passing through it (i.e. to facilitate heat exchange). The main structural characteristics concern porosity (void content), anisotropy, pore connectivity and scale. The effect of scale is complex, since the permeability decreases as the structure is refined, but the interfacial area for fluid-solid heat exchange is, thereby, raised. The durability of the pore structure may also be an issue, with a possible disadvantage of finer scale structures being poor microstructural stability under service conditions. Finally, good mechanical properties may be required, since the development of thermal gradients, high fluid fluxes, etc. can generate substantial levels of stress. There are, thus, some complex interplays between service conditions, pore architecture/scale, fluid permeation characteristics, convective heat flow, thermal conduction and radiative heat transfer. Such interplays are illustrated with reference to three examples: (i) a thermal barrier coating in a gas turbine engine; (ii) a Space Shuttle tile; and (iii) a Stirling engine heat exchanger. Highly porous, permeable materials are often made by bonding fibres together into a network structure and much of the analysis presented here is oriented towards such materials.

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Effect of gas pressure on thermal conductivity of zirconia thermal barrier coatings

Cited by 14 publications

References 6 publications

Quantitative characterization of microstructures of plasma-sprayed coatings and their conductive and elastic properties

Quantitative characterization of microstructures of plasma-sprayed coatings and their conductive and elastic properties

Development of a Thermal Transport Database for Air Plasma Sprayed ZrO2-Y2O3 Thermal Barrier Coatings

Porous materials for thermal management under extreme conditions

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