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Porous TiO₂-Y₂O₃ Ceramics with Specific Infrared-Optical Properties

G. Steinborn, G. Tzschichholz, J. Guenster, M.H. Keller, J. Manara

Journal of Ceramic Science and Technology, Vol. 2, No. 3 (2011), pp. 183-190

DOI: 10.4416/JCST2011-00011

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Abstract

The infrared-optical properties and particularly the emissivity of sintered ceramics depend on the material's bulk properties and structural properties such as porosity, pore size distribution and pore diameter. The infrared-optical properties can be varied across a wide range by specifically selecting the material's bulk and structural properties. A major concern of the present study is the development of a ceramic coating material with a total emissivity below 0.2 at a temperature of 800 °C. For this purpose, various samples of a TiO2-Y2O3 (TY) ceramic composite were produced with different properties. On variation in the Y2O3 content from 5 to 60 wt%, the porosity of the ceramic composites varies from 3 % to 47 % with the mean pore diameter lying in a range from 0.3 μm to 1.7 μm. The addition of graphitic pore builders increases the porosity up to 60 % and the mean pore diameter to a maximum of 15 μm. By optimizing the total porosity and the pore size of the TY ceramics, a total emissivity as low as 0.17 at 800 °C could be achieved.

Keywords

Oxide ceramic, porosity, mean pore diameter, infrared optical properties, emissivity

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