Dispersion of Concentrated Alumina Aqueous Slurry
Osamu TAKAGI, Kazuyuki YUGO, Masakuni OZAWA and Suguru SUZUKI
Abstract:The particle dispersion in concentrated alumina aqueous slurry was investigated from colloidal vibration potential(CVP) and viscosity．In the present work，the CVPs of the slurry(40mass%) were measured by an ultra-sonic vibration method as a function of pH and the concentration of organic dispersants，and viscosities were measured with a rotating cylinder viscometer for the slullies containing 0.04-4mass% dispersant at pH7．The CVP shifted to negative potential side with both increases in pH and the concentrain of dispersant in the range of 0.04-2mass%．The minimum viscosity appeared at with 2mass% dispersant．Moreover，it was found by an elemental analysis that the surface of alumina particles were saturated with dispersant molecules at about 2mass%．From the above mentioned，the CVP measurement thought to be effective in evaluating the particle dispersion in the concentrated alumina aqueous slurry. Key Words:colloidal vibration potential，viscosity，ζ-potential，isoelectric points，aqueous ceramics slurry