Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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



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


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.
Journal of Materials Research
No. 3


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


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