Infrared radiative properties of plasma-sprayed BaZrO3 coatings

Document Type

Article

Publication Date

1-1-2014

Abstract

The room temperature directional-hemispherical reflectance and transmittance spectra of free-standing atmospheric plasma-sprayed BaZrO3 coatings with different thicknesses were measured in the wavelength range of 0.8-15.0μm, and the absorption coefficient and scattering coefficient as a function of wavelength were extracted using the modified four-flux model. Results showed that BaZrO3 is a high scattering, low absorption material at the wavelength <6μm, where turbine engine thermal radiation is most concentrated. The absorption coefficient of BaZrO3 starts to increase rapidly at wavelength of 6μm, indicating that BaZrO3 is high absorbing and opaque in the long wavelength range. A pronounced absorption peak occurs at a wavelength of 7μm, and is associated with a BaCO3 coating impurity. The scattering coefficient of BaZrO3 decreases with the increase of wavelength in the whole measured wavelength range, caused by the decrease of the relative size of the scattering center compared with the wavelength. © 2014 Elsevier Ltd.

Publication Source (Journal or Book title)

Journal of the European Ceramic Society

First Page

3941

Last Page

3949

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