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Effects of Microstructural Evolution on the Thermal Diffusivity of α-Al2O3 Prepare from Nanosize γ-Al2O3 Powder

Published

Author(s)

E J. Gonzalez, Grady S. White, L Wei

Abstract

The thermal conductivity of porous α-Al2O3 specimens prepared using nanosize γ-Al2O3 powder or conventional sub-micro a}-alumina powders was studied. Plots of thermal conductivity versus volume fraction porosity showed that both sets of samples followed identical linear curves. Vickers hardness measurements of these same specimens also followed identical relationships with porosity. These results indicate that these properties are correlated to the volume fraction of porosity in an identical fashion. Furthermore, this good correlation also suggests that thermal resistance from grain boundaries has a lesser effect on the overall thermal transport than the volume of porosity.
Citation
Journal of Materials Research
Volume
15
Issue
No. 3

Keywords

alumina, hardness, nanosize powders, porosity, thermal conductivity, thermal diffusivity, &#947;-Al<sub>2</sub>O<sub>3</sub>

Citation

Gonzalez, E. , White, G. and Wei, L. (2000), Effects of Microstructural Evolution on the Thermal Diffusivity of &#945;-Al<sub>2</sub>O<sub>3</sub> Prepare from Nanosize &#947;-Al<sub>2</sub>O<sub>3</sub> Powder, Journal of Materials Research (Accessed April 22, 2024)
Created February 29, 2000, Updated October 12, 2021