High-Temperature Radiative Properties of an Yttria-Stabilized Hafnia Ceramic
Abstract:The normal spectral emittance of a partially yttria-stabilized hafnia (YSH) ceramic has been measured by infrared emittance spectroscopy in a spectral range going from 60 to 17 500 cm−1 (0.075–2.2 eV), and up to 2350 K. Using these experimental data, the temperature dependence of the absorption coefficient and the total emittance have been calculated. The physical mechanisms explaining the spectral features of the whole set of spectra are exposed qualitatively. The spectral weight of each contribution is then discussed for interpreting the influence of temperature on the total normal emittance in the range of temperatures (1200–2500 K) where YSH ceramics can be used for their refractory properties (thermal barrier coating, nuclear reactor, thermal protection systems, etc.).
Document Type: Research Article
Publication date: June 1, 2011