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Thermal Conductivity of Al2O3–ZrO2 Composite Ceramics
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SYSNO ASEP 0370188 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thermal Conductivity of Al2O3–ZrO2 Composite Ceramics Author(s) Hostaša, J. (CZ)
Pabst, W. (CZ)
Matějíček, Jiří (UFP-V) RID, ORCIDSource Title Journal of the American Ceramic Society. - : Wiley - ISSN 0002-7820
Roč. 94, č. 12 (2011), s. 4404-4409Number of pages 6 s. Publication form web - web Language eng - English Country US - United States Keywords alumina ; zirconia ; composites ; thermal conductivity ; model Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000297848100054 EID SCOPUS 82955212962 DOI 10.1111/j.1551-2916.2011.04875.x Annotation The Al2O3–ZrO2 composite ceramics were prepared by slip casting in plaster molds and sintering at 1350°C in air. The composition of prepared samples varied from pure alumina to doped zirconia (3Y-TZP) with steps of 10 vol%. The relative density of the sintered samples varied from 94% to 98%, depending on the composition. Thermal diffusivity of sintered samples was measured by means of the xenon flash method at 100°C, 200°C, 400°C, 600°C, 800°C, and 1000°C and thermal conductivities were calculated based on measured bulk densities and specific heat data and finally corrected for porosity effects. As expected, the thermal conductivity decreased with increasing zirconia content, and in the case of samples with higher alumina content, it also decreased with increasing temperature. Effective thermal conductivities are close to the lower Hashin–Shtrikman bound and the recently proposed sigmoidal average. Empirical relations were used to fit the dependence of effective thermal conductivity Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2012
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