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 Al2O3 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 Al2O3 (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.
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Pivinskii, Y.E., Dyakin, P.V. & Dyakin, P.V. Dispersing (Deflocculating) Aluminas. Refractories and Industrial Ceramics 45, 201–209 (2004). https://doi.org/10.1023/B:REFR.0000036730.62623.f7