| pH Controlled Dispersion of Non-oxide
Ceramic Powders in Aqueous Media |
R. RAMACHANDRA RAO, H. N. ROOPA AND T. S. KANNAN
Pages : 25-28
DOI : 10.1080/0371750X.1999.10799852 |
| Abstract |
| The dispersion of Si, SiC and Si~4 powders in deionised
water was optimized as a function of pH in the range 2-12.
Various experimental techniques like particle size analysis,
sedimentation, viscosity and rheology and electrokinetic
behaviour were used to characterize the slurries. The optimally
dispersed sl~rry displayed minimum sedimentation
height, minimum viscosity, near newtonian Dow behaviour
and maximum zeta potential. When cast into plaster moulds,
the 44 vol% SiC and Si3N4 slips and 52 vol% Si slips yield
green bodies having 55-65% of theoretical density. |
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