Abstract
A mathematical model has been presented to describe the influence of the solids and electrolytes concentration on the rheological and casting properties of porcelain slips and on the bending dry strength of castings. The shear-dependent behaviour of the casting slips is pseudoplastic with an expressed yield stress, and the Herschel-Bulkley equation provided the best data fitting for the flow curves. A pronounced thixotropy is also established. The rheological parameters and casting rate decrease by reducing the solids concentration and increasing the amount of sodium silicate in the slips. Optimal values areas of the solids and sodium silicate concentration for each composition of the solid phase with respect to the rheological and casting properties of slips, as well as the bending dry strength of castings are determined. The correlation dependences between the mechanical, casting and rheological properties are thus obtained.
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