Thermal Diffusivity/Conductivity of Alumina-Silicon Carbide Composites

Thermal diffusivity and conductivity values for several Al2O3‐SiC whisker composites were determined. The thermal diffusivity values spanned the range from 373 to 1473 K, and thermal conductivity data wre obtained between 305 and 365 K. The thermal diffusivity decreased with increasing temperature a...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1990-02, Vol.73 (2), p.461-464
Main Authors: McCluskey, Philip H., Williams, Robert K., Graves, Ron S., Tiegs, Terry N.
Format: Article
Language:English
Subjects:
360202 > Ceramics, Cermets, & Refractories-- Structure & Phase Studies
656100 > Condensed Matter Physics-- Superconductivity
alumina
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
Applied sciences
Building materials. Ceramics. Glasses
CARBIDES
CARBON COMPOUNDS
Ceramic industries
CHALCOGENIDES
Chemical industry and chemicals
COMPOSITE MATERIALS
composites
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
Exact sciences and technology
MATERIALS
MATERIALS SCIENCE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUENCHING
silicon carbide
SILICON CARBIDES
SILICON COMPOUNDS
SUPERCONDUCTING COMPOSITES
Technical ceramics
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES 360204 > Ceramics, Cermets, & Refractories-- Physical Properties
WHISKERS
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Summary:Thermal diffusivity and conductivity values for several Al2O3‐SiC whisker composites were determined. The thermal diffusivity values spanned the range from 373 to 1473 K, and thermal conductivity data wre obtained between 305 and 365 K. The thermal diffusivity decreased with increasing temperature and increased with SiC‐whisker content. An estimate of the thermal conductivity of the whiskers was obtained from the direct thermal conductivity measurements, but attempts to derive whisker conductivity values from the thermal diffusivity data were not successful because the laser flash method lacks the required accuracy and precision. Specimens were subjected to two different thermal quench experiments to investigate the effect of thermal history on diffusivity. In the most severe case, multiple 1073‐ to 373‐K quenches, radial cracks were observed in the test specimens; however, there was no change in diffusivity. The lack of sensitivity to thermal cycling appears to be related to the sample size.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1990.tb06538.x