Porous Alumina and Zirconia Ceramics With Tailored Thermal Conductivity

0392788 - ÚFP 2014 RIV GB eng J - Journal Article
Gregorová, E. - Pabst, W. - Sofer, Z. - Jankovský, O. - Matějíček, Jiří
Porous Alumina and Zirconia Ceramics With Tailored Thermal Conductivity.
Journal of Physics: Conference Series. Roč. 395, č. 1 (2012), 012022-012022. ISSN 1742-6588. E-ISSN 1742-6596.
[European Thermal Sciences Conference (Eurotherm)/6./. Poitiers, 04.09.2012-07.09.2012]
Institutional support: RVO:61389021
Keywords : Ceramics * alumina * zirconia * porosity * thermal conductivity * pore-forming agent * oxide ceramics * starch * porosity
Subject RIV: JK - Corrosion ; Surface Treatment of Materials
http://iopscience.iop.org/1742-6596/395/1/012022/pdf/1742-6596_395_1_012022.pdf

The thermal conductivity of porous ceramics can be tailored by slip casting and uniaxial dry pressing, using either fugitive pore formers (saccharides) or partial sintering. Porous alumina and zirconia ceramics have been prepared using appropriate powder types (ungranulated for casting, granulated for pressing) and identical firing regimes (but different maximum temperatures in the case of partial sintering). Thermal diffusivities have been measured by the laser- and xenon-flash method and transformed into relative thermal conductivities, which enable a temperature-independent comparison between different materials. While the porosity can be controlled in a similar way for both materials when using pore formers, partial sintering exhibits characteristic differences between alumina and zirconia (for alumina porosities below 45 %, full density above 1600 °C, for zirconia porosities below 60 %, full density above 1300 °C). The different compaction behavior of alumina and zirconia
Permanent Link: http://hdl.handle.net/11104/0221570