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Rheological behaviour of NiO/YSZ slurries for drying-free casting

Amini Horri, B, Dong, D, Selomulya, C and Wang, HT (2012) Rheological behaviour of NiO/YSZ slurries for drying-free casting Powder Technology, 223. pp. 116-122.

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We have recently developed a new drying-free casting method for shape forming of ceramics, in which a polymerizable solvent such as furfuryl alcohol (FA) is used to disperse the ceramic powders, and then polymerized into a poly (furfuryl alcohol) (PFA) binder during the casting process. Compared with conventional casting processes, this method offers more flexibility in controlling the microstructure of ceramics and eliminates defects that are likely to arise from the drying step. Controlling the rheological behaviour of ceramic slurries is an important step in the casting process to achieve improved microstructural properties. In this study, the viscosity of slurries comprising NiO/YSZ (yttria stabilized zirconia) powders and FA as solvent was investigated over a wide range of shear rates (1 s− 1–1000 s− 1) and at different volumetric solid concentrations (from 20% to 70%), while the effects of dispersant were quantified by adding different amounts of PVP (polyvinyl pyrrolidone) between 1 wt.% and 4 wt.%. The minimum viscosity of NiO/YSZ/FA slurries could be achieved with 2 wt.% dispersant. The experimental data relating the changes in viscosity to the volumetric solid concentration were modeled using different viscosity models, with Liu's equation showing the best fit for NiO/YSZ/FA slurries with and without dispersant. The slurries showed a highly pseudoplastic behaviour without dispersant, while adding PVP as dispersant effectively modified the rheological behaviour toward Newtonian fluids.

Item Type: Article
Subjects : Chemical and Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
Amini Horri, B
Dong, D
Selomulya, C
Wang, HT
Date : 30 June 2012
DOI : 10.1016/j.powtec.2011.06.015
Copyright Disclaimer : © 2012 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Ceramic slurry, Viscosity, Rheology, Drying-free casting, Rheological modeling
Depositing User : Symplectic Elements
Date Deposited : 30 Mar 2017 09:01
Last Modified : 30 Mar 2017 09:08

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