Influence of the stabilising mechanism and solid loading on slip casting of alumina

摘要: Abstract Two commercial surface active agents that act through different stabilisation mechanisms, were used to disperse aqueous alumina suspensions. Electrophoretic measurements performed determine the zeta potential curves of bare and charge modified particles and, hence, stabilising performance dispersants. Drying–shrinkage behaviour (Bigot’s curves) Hg porosimetry characterise slip cast bodies prepared from suspensions at solid loading. The rheological starting was also determined in order relate flow properties with superficial nature suspended wet body microstructure. Rheological have showed slips containing dispersant confers highest values more viscous than when using less capable terms modifier. These findings explained by a larger interaction size dispersed pure electrostatic mechanism which resulted higher effective volume fraction these For both dispersants used, Bigot’s indicated shrinkage slopes straight lines corresponding first stage drying decrease increasing solids concentration. variations slope derive broadening pore distribution as result difficulties concentrated suspensions, agreement measurements. Good correlations found between green microstructure, rheology particle forces.