Fibrillar γ-Alumina Porous Body Prepared by Slip Casting

摘要

The effects of pH and the concentration of the nano fibers of γ-alumina on the relative density of porous material have been investigated. The viscosity of the aqueous suspensions were determined under controlled rate conditions, varying the pH and solid concentration. It was found that the maximum solid loading in the suspension at pH 4 and 4.5 was 40 and 35 wt.% respectively, and the isoelectric point (IEP) of the powder in the suspension occurs at pH 8.5. The pH values used below the IEP and the resulting agglomeration of the particles affect the relative viscosity of the suspension, and consequently the final relative density of the slip cast body, which at a low pH was higher than that obtained close to the IEP.