engleski

Optimization of viscosity of highly concentrated alumina suspensions for slip casting by surface response methodology

In this work highly concentrated (70 wt.%) aqueous suspensions of alumina (Al2O3) were prepared for slip casting. The suspensions were stabilized with different combinations of three dispersants (A) disodium salt monohydrate (Tiron), (B) Darvan C-N, 4, 5-dihydroxy-1, 3-benzenedisulfonic acid, and (C) citric acid monohydrate. Amounts of three dispersants were selected due to the simplex lattice mixture design in aim to evaluate the effect of dispersant content and their combination on rheological properties of highly concentrated alumina suspensions. The regression analysis and the response surface plots showed synergistic effect on decreasing suspension viscosity below 12 mPas, after addition small concentrations of the dispersants Tiron and the citric acid to the Darvan. The antagonistic effect of mixture of dispersants was obtained, after addition small amounts of the Darvan and the citric acid to the Tiron, with increasing viscosity up to 20 mPas.

Alumina suspension, Darvan C-N, Tiron, Citric acid monohydrate, Simplex lattice mixture design

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