engleski

Application of Simplex Lattice Mixture Design for Optimization of Rheological Properties of Alumina Suspensions for Slip Casting

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. The amounts of the dispersants were selected using the Simplex lattice mixture design to evaluate the effect of the dispersants content and their combination on the rheological properties of highly concentrated alumina suspensions. The regression analysis and the response surface plots showed a synergistic effect on decreasing the apparent suspension viscosity below 12 mPa•s, after the addition of small concentrations of the dispersants Tiron and the citric acid to the Darvan C-N. The antagonistic effect of the mixture of dispersants was obtained after adding small amounts of the Darvan C-N and citric acid to the Tiron, which increased the apparent viscosity up to 20 mPa•s.

alumina suspension ; slip casting ; viscosity ; Simplex lattice mixture design

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