Abstract
The gelcasting of SiC dispersed in deionised water was studied, using agarose as gelling agent. A well dispersed system was prepared by controlling the zeta potential as a function of pH. The maximum solids loading was determined by rheological measurements and the relationship between the relative viscosity and volume fraction using the Krieger-Dougherty equation. The maximum solids loading was 54 vol.-% of SiC suspension in an aqueous medium at pH 9·5. Gelation of the system was studied by measuring heights of samples before and after demoulding. The density of the green body produced was determined and its morphology characterised using scanning electron microscopy. It was found that the density of the green body was 60·7% of theoretical, and higher than that produced by gelcasting using polymer (54%).
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