Abstract
Tetragonal zirconia polycrystal doped with 1.5 wt% CoO and 1.5 wt% Al 2O 3 showed large and faceted CoAl 2O 4 spinel grains existing in clusters and large monoclinic zirconia grains. Major stages of microstructural evolution during sintering included (1) formation of spinel as a result of preferred segregation of CoO to Al 2O 3 phase, (2) exudation of liquid phase to grain junctions among faceted spinel grains and zirconia grains, and (3) growth of spinel grains and the zirconia grains adjacent to the spinel phase.
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