Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 91, Issue 11, Pages 3546-3551Publisher
WILEY
DOI: 10.1111/j.1551-2916.2008.02727.x
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In the present work, the effects of milling and calcination temperature on the compressibility and sinterability of a nanocrystalline Al2O3-Y3Al5O12 composite powder prepared by an aqueous sol-gel method were investigated. The results showed that calcination temperature has a strong influence on the sinterability and final microstructure of amorphous powders. The lower calcination temperatures below 800 degrees C resulted in the reduction of density and formation of a vermicular microstructure after sintering. It was also found that breaking of hard agglomerates into particles and smaller agglomerates after 1 h of milling leads to an increase in green density at the early stage of compaction when the rearrangement of particles is the dominant mechanism of the densification. The best-performing sample was that calcined at 800 degrees C and milled for 1 h, which yielded a relative density of 95% with a micronic/sub-micronic microstructure after sintering at 1500 degrees C.
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