Filtern
Dokumenttyp
- Posterpräsentation (6)
- Zeitschriftenartikel (1)
- Beitrag zu einem Sammelband (1)
- Vortrag (1)
Referierte Publikation
- nein (9) (entfernen)
Schlagworte
- Emissivity (1)
- Infrared optical properties (1)
- Mean pore diameter (1)
- Oxide ceramic (1)
- Porosity (1)
Eingeladener Vortrag
- nein (1)
Porous composite materials from nano-powders with customised radiative transport characteristics
(2007)
Maßgeschneiderte poröse TiO2-Y2O3-Keramiken mit spezifischen infrarot-optischen Eigenschaften
(2010)
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.