Thermal Conductivity of Yttria–Zirconia Single Crystals, Determined with Spatially Resolved Infrared Thermography |
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| Authors: | Jean-Franç ois Bisson,Daniè le Fournier,Martine Poulain,Odile Lavigne,Ré my Mé vrel |
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| Affiliation: | Ecole Supérieure de Physique et Chimie Industrielles, Laboratoire d'Optique Physique, 75005 Paris, France;ONERA, Metallic Materials and Processes Department, BP 72, 92322 Cȟtillon, France |
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| Abstract: | The thermal diffusivity of yttria–zirconia (Y2O3–ZrO2) single crystals, with YO1.5 concentrations in the range of 0–60 mol%, has been determined using a new method that is based on spatially resolved (20 μm) infrared mapping of a modulated thermal field. The decreasing trend of the thermal conductivity ( K ), as a function of the YO1.5 content (up to 20 mol%), can be described using a model based on a Debye approach that has been modified by introducing a cut-off length for the phonon mean free path. At higher concentrations, K increases, as a result of a possible ordering of the point defects. |
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| Keywords: | thermal conductivity zirconia: yttria stabilized single crystals |
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