Emittance of Y2O3 stabilised ZrO2 thermal barrier coatings prepared by electron-beam physical-vapour deposition

Manara, Jochen; Brandt, Rainer; Kühn, Joachim; Fricke, J.; Krell, T.; Schulz, Uwe; Peters, M.; Kaysser, W. A.

doi:10.1068/htwu68

Cited by 20 publications

(29 citation statements)

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“…Unfortunately, this radiation part cannot be extracted from the radiation correction of the LFA measurement This requires a detailed analyses of the influence of radiation, translucency and emissivity of TBCs that can be found e.g. in [21,22]. An additional effect that needs to be considered when measuring k is the atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Thermal conductivity issues of EB‐PVD thermal barrier coatings

Schulz¹,

Rätzer‐Scheibe

Saruhan

et al. 2007

Materialwissenschaft Werkst

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The thermal conductivity of electron-beam physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) was investigated by the Laser Flash technique. Sample type and methodology of data analyses as well as atmosphere during the measurement have some influence on the data. A large variation of the thermal conductivity was found by changes in TBC microstructure. Exposure at high temperature caused sintering of the porous microstructure that finally increased thermal conductivity up to 30 %. EB-PVD TBCs show a distinct thickness dependence of the thermal conductivity due to the anisotropic microstructure in thickness direction. Thin TBCs had a 20 % lower thermal conductivity than thick coatings.

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Section: Methodsmentioning

confidence: 99%

Thermal conductivity issues of EB‐PVD thermal barrier coatings

Schulz¹,

Rätzer‐Scheibe

Saruhan

et al. 2007

Materialwissenschaft Werkst

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“…The Christiansen wavelength of ceramics typically lies in the infrared spectral region and is therefore of high practical use, as it enables the contact-less detection of the temperature of ceramic samples [2]. For sufficiently thick samples the emittance equals one at the Christiansen wavelength k Chr and therefore the emittance is well-known at k Chr .…”

Section: Introductionmentioning

confidence: 99%

“…Thermal barrier coatings (TBCs) in aircraft and stationary turbo engines [2] or thermal insulations of high temperature furnaces are only few examples for such applications. For determining the heat transfer at elevated temperatures the knowledge of the infrared-optical properties is of high importance as the emission of thermal radiation and therefore the heat exchange between surfaces increases with increasing temperature T, proportional to T 4 [3].…”

Section: Introductionmentioning

confidence: 99%

Infrared-optical characteristics of ceramics at elevated temperatures

Manara

Arduini-Schuster

Keller

2011

Infrared Physics & Technology

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“…The ceramic coating presented in this work was prepared at the German Aerospace Center (DLR) via EB-PVD (electron-beam physical-vapor deposition) as explained in Ref. 17.…”

Section: Sample Production and Experimental Setupmentioning

confidence: 99%

Development and Characterization of Low-Emitting Ceramics

et al. 2007

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The infrared-optical properties of ceramics are correlated with the complex index of refraction of the material and the structure of the ceramic. By changing these parameters, the infrared-optical properties can be changed over a relatively wide range. The correlation of the structural properties (like the porosity or the pore sizes) and the material properties (such as the complex index of refraction on the one hand and the infrared-optical properties such as emittance on the other) are described by a solution of the equation of radiative transfer and the Mie-theory. Within this work, low-emitting ceramics, which have significantly lower emittances than conventional ceramics, were prepared by optimizing their composition and structure. The spectral emittance of these ceramics was measured, and a total emittance dependent on temperature was calculated from the spectral emittance. As a result, one obtains ceramics which have a total emittance of 0.2 at a temperature of 1,100 K. In comparison to conventional ceramics with a typical total emittance of 0.8 at 1,100 K, the use of such low-e ceramics leads to a reduction in heat transfer of about 70% via thermal radiation. The results of our calculations were compared with experimental data to validate the theory.

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Emittance of Y2O3 stabilised ZrO2 thermal barrier coatings prepared by electron-beam physical-vapour deposition

Cited by 20 publications

References 0 publications

Thermal conductivity issues of EB‐PVD thermal barrier coatings

Thermal conductivity issues of EB‐PVD thermal barrier coatings

Infrared-optical characteristics of ceramics at elevated temperatures

Development and Characterization of Low-Emitting Ceramics

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