Abstract
Stepped cup compact were formed by a uniaxial hydraulic press from alumina granule with 3wt% PVA (Polyvinyl Alchohol) after admixing liquid paraffin, and density distribution in green compact was measured. The difference in local density of green compact could be reduced by press flow compaction, in spite of that the decreasing was impossible by dry compaction. It was confirmed that when green compact was formed from the granule with the sufficient flowability by admixed liquid paraffin, the densified powder flowed from the bottom to the cup wall during compaction.
The relative density of sintered compact was 92%, and diameter shrank by 15% in average. In dry compaction, the difference in diameter of the sintered compact is large, but in pressurized flow compaction with lOwt% liquid paraffin the shrinkage was almost uniform along the cup wall.
