Journal
JOURNAL OF MATERIALS RESEARCH
Volume 20, Issue 5, Pages 1348-1355Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2005.0168
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Colloidally stable suspensions are required to fabricate dense samples with uniform microstructure by colloidal processing methods, which necessitate dispersion of ceramic powders in a liquid medium. Aqueous nano ZrO2 suspensions were prepared using polyethylenimine (PEI) as a dispersant. PEI adsorption on nano ZrO2 surfaces was promoted with increasing initial PEI content and suspension pH. Isoelectric point was shifted from pH 7 at 0 wt% PEI to pH 10.4 at 3 wt% PEI. Stable suspensions had mean particle sizes in the range of 100 to 150 nm and sedimentation rates less than 0.4 mm/h, as compared to 2-5.5 mu m and 10-50 mm/h for unstable suspensions. Samples with 98% relative density were fabricated after sintering at 1300 degrees C for 4 h from colloidally stable suspensions.
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