Abstract
Aqueous silicon nitride suspensions with solid volume fractions of 0.2 –0.5 were prepared from preoxidized and electrosterically stabilized powder mixtures. The filtration kinetics during pressure casting with constant filtration rate up to a maximum pressure of 10 MPa into porous steel molds were examined. Resulting from the constant filtration rate the hydrodynamic conditions for particle incorporation in the growing cake surface remain independent of the cake thickness. Thus, gradient-free green compacts with a fractional density of 0.6 were obtained which could be further densified by isostatic compression up to 0.74. Significantly higher matrix densities than for cold isostatically pressed samples could also be obtained for composite materials containing up to 20 vol.% of SiC platelets.
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