Determination of Scattering and Absorption Coefficients for Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings at Elevated Temperatures

The temperature dependence of the scattering and absorption coefficients for a set of freestanding plasma‐sprayed 8 wt% yttria‐stabilized zirconia (8YSZ) thermal barrier coatings (TBCs) was determined at temperatures up to 1360°C in a wavelength range from 1.2 μm up to the 8YSZ absorption edge. The...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2009-10, Vol.92 (10), p.2276-2285
Main Authors: Eldridge, Jeffrey I., Spuckler, Charles M., Markham, James R.
Format: Article
Language:English
Subjects:
Ceramics
High temperature
Plasma
Scattering
Sorption
Zirconium
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Summary:The temperature dependence of the scattering and absorption coefficients for a set of freestanding plasma‐sprayed 8 wt% yttria‐stabilized zirconia (8YSZ) thermal barrier coatings (TBCs) was determined at temperatures up to 1360°C in a wavelength range from 1.2 μm up to the 8YSZ absorption edge. The scattering and absorption coefficients were determined by fitting the directional‐hemispherical reflectance and transmittance values calculated by a four‐flux Kubelka–Munk method to the experimentally measured hemispherical‐directional reflectance and transmittance values obtained for five 8YSZ thicknesses. The scattering coefficient exhibited a continuous decrease with increasing wavelength and showed no significant temperature dependence. The scattering is primarily attributed to the relatively temperature‐insensitive refractive index mismatch between the 8YSZ and its internal voids. The absorption coefficient was very low (
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2009.03217.x