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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 53  1994
Compaction Behaviour of Alumina Powders I : Effect of Grinding, Calcination and Incorporation of Fused Grains
P. G. PAL* AND B. N. SAMADDAR**
Pages : 85-90
DOI : 10.1080/0371750X.1994.10804646
Abstract
Very poor con~pac:tion occurs in case of technical grade alumina powder produced by Bayers process. Ground, washed and dried technical alumina powder yields low green density (47% theoretical) even by isostatic pressing (2000 kg.cm-1 forming pressure) and does not follow any powder compaction models suggested in the case of other irregular shaped ceramic powders. Precalcination of the processed fine powders (0.3 to 0.4 J.lm) between 1100 and 1600C causes reduction of the void volume present in the agglomerated powder resulting in better densification ( -70% theoretical) obtained at 1550 kg.cm-1 forming pressure. More than 80% theoretical density in the green stage was possible with fused alumina grains incorporated with processed technical alumina powder at 1550 kg.cm"1 forming pressure.
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