Dispersing (Deflocculating) Aluminas.

Authors :: Pivinskii, Yu. E.
Dyakin, Pav. V.
Dyakin, P. V.
Source :: Refractories & Industrial Ceramics; May/Jun2004, Vol. 45 Issue 3, p201-209, 9p, 1 Diagram, 2 Charts, 9 Graphs
Publication Year :: 2004
Abstract: The rheological properties of aqueous suspensions of a reactive alumina and high-alumina cements have been studied, and a method for evaluating the thinning effect due to agents used to deflocculate ceramic casting systems has been developed; a classification of thinning agents is proposed. Alumina dispersants make it possible to decrease the moisture content of Al<subscript>2</subscript>O<subscript>3</subscript> suspensions by 50 – 60 rel.% and increase their volume concentration from 0.50 to 0.65. The characteristics of dispersing aluminas used for the thinning (deflocculation) of new refractory castables containing Al<subscript>2</subscript>O<subscript>3</subscript> (76 – 96%) and organic deflocculants are given. Suspensions based on four types of dispersants (with a moisture content of 19 – 25%) exhibiting a thixotropic flow behavior are considered. [ABSTRACT FROM AUTHOR]