Journal of Materials Science, Vol.33, No.11, 2931-2935, 1998
Dependence of the rheological behaviour of electrostatically stabilized alumina slurries on pH and solid loading
Alumina slurries with different solid loadings were prepared using aqueous solutions of hydrochloric acid the concentrations of which were predetermined as suitable for dispersing media; their rheological behaviour was investigated with respect to the pH of the slurry. In regions of low pH (below 3.5), the viscosity of the slurries gradually increased with decreasing pH of the slurry, irrespective of the amount of solid loading. Near the isoelectric point of alumina (about pH 8-8.5), the viscosities of the slurries were high and dependent on the solid loading. The pH range which exhibits the regions with low viscosity narrows on increasing the solid loading. These results were interpreted using an interparticle potential energy diagram for the slurry system.