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Title: Influence of surfactant addition sequence on the suspension properties and electrophoretic deposition behaviour of alumina and zirconia
Authors: Popa, Ana Maria ×
Vleugels, Jef
Vermant, Jan
Van der Biest, Omer #
Issue Date: 2006
Publisher: Elsevier Science Publishers
Series Title: Journal of the European Ceramic Society vol:26 issue:6 pages:933-939
Abstract: A well-known polyelectrolyte salt, ammonium poly methacrylate (Darvan-C) is used to stabilise ethanol-based Al2O3\ and Ce-ZrO2 suspensions with butylamine addition. The sequence in which n-butylamine and Darvan-C are added to the suspension greatly affects the properties of the wet deposit obtained by electrophoretic deposition. To investigate this effect, electrical conductivity of the suspension and the shear rate dependence of its viscosity are investigated. When n-butylamine is added first, the equilibrium in the suspension is almost immediately reached and a plastically deformable wet deposit is obtained over it large n-butylamine/Darvan-C ratio. The suspension has a shear-thinning viscosity and the deformable deposit is characterised by a high solvent content, which allows the rearrangement of particles during drying. When Darvan-C is added before the n-butylamine, the wet deposit is smooth and rigid. The suspension has a lower viscosity and a near-Newtonian behaviour is observed. A similar behaviour is observed for Al2O3 and Ce-ZrO2 suspensions. The green density of the dried deposits is not influenced by the addition sequence and higher green densities are obtained for Al2O3 when compared to Ce-ZrO2, (c) 2005 Elsevier Ltd. All rights reserved.
URI: 
ISSN: 0955-2219
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Soft Matter, Rheology and Technology Section
× corresponding author
# (joint) last author

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