Abstract
This study used surface area density measurements and microstructural paths to show differences in the microstructural evolution of two densifying alumina ceramics. There were significant differences in comparison to previous studies of this nature, which have been conducted mostly on powder metals. The study showed that the alumina ceramic derived from high surface area powders, lost 66% of its solid-vapor interface on heating to 1,000 C at 5 C/min. The results were consistent with pure coarsening in this temperature range. The measurements of surface area density of solid-solid boundaries suggested that most of the solid-solid interface was formed at densities below 70% or during the calcination of the powders. It is apparent that more work is required to determine which microstructure paths are most useful in the study of densifying ceramics.
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