Review article

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

Darko Landek ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
Lidija Ćurković ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
Ivana Gabelica ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
Irena Žmak ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
Zrinka Švagelj ; Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia

Abstract

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

Keywords

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

Hrčak ID:

270508

URI

https://hrcak.srce.hr/270508

Publication date:

1.11.2021.

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