Abstract
This work presents, in a first stage the influence of aluminium nitride (AlN) addition to a well dispersed α-alumina slurry, and in a second stage the influence of silicon carbide (SiC) phase to a Al 2O 3 AlN slurry. We have shown that the acid-basic character of polymer dispersants and powder surface play a major role in the adsorption phenomena of dispersant onto a surface: an acidic polymer will have a better affinity with a basic powder surface than with an acidic surface and vice versa. This study has allowed to determine the dispersion conditions of each powder in an azeotrope medium (methyl ethyl ketone-ethanol) with phosphoric ester (PE) on Al 2O 3 powder and polyvinylpyrrolidone (PVP) on SiC and AlN powders. If, for two components (Al 2O 3AlN) the best conditions of dispersion lead to a homogeneous material, it is not the same for three-powder mixtures (Al 2O 3AlNSiC).
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