Pressure Filtration of Al2O3 Small Powder.

Abstract

Pressure filtration technique was applied for the consolidation of alumina small powders (average particle sizes of 20, 10 and 5nm). Suspensions were prepared by adding appropriate amount of polycarboxylic ammonium. Apparent density of the consolidated bodies decreased as the particle size becomes smaller, whereas the density was pressure-insensitive over applied pressure range of 1.5 to 10.0MPa. The kinetics and mechanics of the consolidation of the particles were discussed from the dehydration and consolidating rates of the suspensions. The transportation process of suspensions in consolidated layer was confirmed during all filtration processing as the rate limiting process.