Reference : Colloidal stability of aqueous suspensions of barium zirconate
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Colloidal stability of aqueous suspensions of barium zirconate
Boschini, Frédéric mailto [Université de Liège - ULiège > Département de physique > Physique statistique >]
Rulmont, André mailto [Université de Liège - ULiège > > Chimie inorganique structurale >]
Cloots, Rudi mailto [Université de Liège - ULiège > > Chimie inorganique structurale >]
Moreno, R. [> > > >]
Journal of the European Ceramic Society
Elsevier Sci Ltd
Yes (verified by ORBi)
[en] suspensions ; colloidal behaviour ; rheology ; slip casting ; BaZrO3
[en] In this article, the colloidal behaviour of aqueous suspensions of barium zirconate is investigated. The variation of zeta-potential as a consequence of changing the pH and the concentration of an anionic polyelectrolyte is studied, the isoelectric point occurring at pH 5.3. The IEP shifts down on calcining the powder and also when anionic polyelectrolytes are added. Rheological studies have been made on suspensions prepared to a solids loading of 27 vol.% (72 wt.%). Optimum dispersing conditions are reached for suspensions prepared at basic pH with 1.5 wt.% tetramethylammonium hydroxide (TMAH) and a concentration of ammonium polymethacrylate (PMAA) of 1.6 wt.%. Comparison with similar suspensions prepared with NaOH instead PMAA demonstrated that TMAH gives an extra contribution to stability, probably related to the adsorption of N+(Me)(4) groups. The suspensions were slip cast, and green densities higher than 60% of theoretical were obtained. (c) 2004 Elsevier Ltd. All rights reserved.

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