Colloidal processing of cordierite-based glass-ceramics

In this work, five levels of dispersant concentrations were used to prepare cordierite-based glass ceramic suspensions with different solid loadings. The Bingham model could be used to characterise rheological behaviour of 50 wt.% solid loaded suspensions, whereas it gradually changed to shear thickening at higher dispersant concentrations as the solid loadings further increased (60, 70 wt.%). A critical dispersant concentration, which provided the lowest stress, was obtained at 0.6 wt.% for Dolapix. The particle size ratio between cordierite and glass powder also plays an important role in rheological properties of the suspensions and green densities. The green density increased as the solid loadings in the suspensions further increased. (C) 2001 Elsevier Science Ltd. All rights reserved.