Evaluation of rheological parameters of cordierite suspensions

In this paper slip casting forming method for cordierite glass ceramic was investigated. Oxide raw materials and three dispersants were used for desirable suspension preparation. Raw materials processing (mixing and clcination, mixing and fritizing), milling time (both for wet and dry milling) and the dispersants percentages are the examined parameters in order to choose the stability conditions. Evaluation of the prepared suspensions were done using rheology, particle size distribution, zeta potential, slip casting rate and sedimentation tests. Results show that Dolapix PCN can be introduced as the most suitable dispersants for suspension preparation. The behavior of the suspensions were shear thinning at low shear rates and shear thickening at high shear rates. The stability of the suspension which was prepared by frit and the green density of its forming article were higher rather than the other suspensions.