In this paper the radiative properties of air plasma sprayed (APS) thermal barrier coatings are investigated by measuring the spectral diffuse reflectance and transmittance of samples with various thickness and porosities in a broad spectral band ranging from 0.25 to 15μm. The spectral absorption and scattering coefficients are obtained by a four flux model based on the experimental data. The results show that the porous zirconia ceramics exhibits high scattering coefficient (> 15000 m−1) and low absorption coefficient (< 500 m−1) in the spectral range from 0.5 to 6μm, and the corresponding spectral scattering albedo reaches up to 0.99. In addition, this study also found that the spectral scattering coefficient increases with increasing porosity, while the spectral absorption coefficient is not quite sensitive to the change of porosity. This result confirms the fact that scattering is mainly caused by the refractive index mismatch between bulk YSZ and internal void. Spectral scattering coefficient heavily depends on the microstructures of coatings, i.e., pore size, porosity and pore distribution, and this will in turn considerably affect the thermal radiation heat transfer inside the coating.
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ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer
December 11–14, 2013
Hong Kong, China
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-5615-4
PROCEEDINGS PAPER
Experimental Study of Wide-Range Spectral Radiation Properties of Air Plasma Sprayed Thermal Barrier Coatings
Gang Yang,
Gang Yang
Shanghai Jiao Tong University, Shanghai, China
Search for other works by this author on:
Changying Zhao
Changying Zhao
Shanghai Jiao Tong University, Shanghai, China
Search for other works by this author on:
Gang Yang
Shanghai Jiao Tong University, Shanghai, China
Changying Zhao
Shanghai Jiao Tong University, Shanghai, China
Paper No:
MNHMT2013-22041, V001T05A001; 9 pages
Published Online:
February 26, 2014
Citation
Yang, G, & Zhao, C. "Experimental Study of Wide-Range Spectral Radiation Properties of Air Plasma Sprayed Thermal Barrier Coatings." Proceedings of the ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. Hong Kong, China. December 11–14, 2013. V001T05A001. ASME. https://doi.org/10.1115/MNHMT2013-22041
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