Influence of pore structure in green compacts on the densification of SiC-Al2O3-Y2O3

Dean-Mo LIu*

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Pore size, pore size distribution (PSD), and the resultant densification behavior of α-SiC granular compacts, which were shaped under the uniaxial compaction pressure of 6.8-154 MPa, were investigated. Three kinds of SiC granules were used, namely Powder R (as-received spray-dried granules), Powder C (after classification of the Powder R), and Powder G (after grinding of the Powder R). Experimental results showed that at low compaction pressures, the green compacts derived from Powder R and Powder C exhibit a bimodal PSD, which is primarily caused by the presence of intergranular porosity. At relatively high compaction pressures, all of the green compacts display a roughly similarly unimodal PSD and exhibit a similar densification behaviour regardless of the starting granule characteristics. The green compacts with a narrow and unimodal PSD can be easily densified to a high-density sintered body and this behaviour was particularly pronounced for the green compacts derived from the ground granules even when the applied compaction pressure is relatively low.

Original languageEnglish
Pages (from-to)403-406
Number of pages4
JournalCeramics International
Volume22
Issue number5
DOIs
StatePublished - 1 Jan 1996

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