Abstract
The microstructure development during hot-pressing of SiC whisker reinforced alumina-based ceramics has been studied by transmission electron microscopy as a function of the composite density. Small fully densified domains including only alumina and zirconia particles were observed from an apparent density of 80% of the theoretical density. This corresponded mainly to porosity redistributions in the whisker vicinity. Afterwards, densification consisted in the shrinkage of that porosity. The role of zirconia grains on alumina grain growth was also analyzed. It appeared that grain growth hindrance was the most efficient when zirconia particles were gathered in clusters, SiC efficiency being noticeable only at the end of densification.
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