THE STABILITY OF ALUMINA-ZIRCONIA SUSPENSIONS

Mixed suspensions exhibit heterocoagulation and therefore their pH ran ge of stability is different from that of single powder suspensions. T he effect of electrical double layer forces on the stability of single and mixed suspensions of alumina and zirconia was experimentally asse ssed by settling studies on dilute suspensions and rheological studies on concentrated suspensions. The stability of single and mixed suspen sions was modelled in terms of the stability ratio (W) and the predict ed pH range of stability were found to be in reasonable agreement with the experimental data. The behaviour of concentrated suspensions (up to 30 vol.%) was similar to that of 0.1 wt.% dilute suspensions. (C) 1 998 Elsevier Science B.V.