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Rheological Behavior of Alumina Aqueous Suspension for Extrusion Gelation Freeform Fabrication

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Abstract:

Extrusion gelation freeform fabrication (EGFF) is a new solid freeform fabrication technique to fabricate ceramic parts. The study of ceramic suspensions rheological behavior is essential to a better understanding of parts fabrication through EGFF process. In this paper, the effects of dispersant concentrations, solids loading and binder composition on the rheological behavior of alumina suspensions were examined. The optimal amount of dispersant was found to be about 0.1 wt.%. The suspensions with 50 vol.% alumina and 1wt.% sodium alginate show shear thickening behavior. Such behavior is unfavorable for extrusion gelation freeform fabrication. By addition of PVA or styrene-acrylic latex, the rheological behavior of suspensions was changed. The addition of PVA or latex has a great effect on the viscosity of the suspensions and the type of their rheological behavior. The ceramic suspensions with PVA or latex were found to be shear thinning more suitable for EGFF.

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Periodical:

Key Engineering Materials (Volumes 336-338)

Pages:

984-987

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.336-338.984

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Online since:

April 2007

Authors:

Zhi Yong Yu, Xi Wei Qi, Yong Huang, Chang An Wang, Shi Xi Ouyang

Keywords:

Aluminum (Al), Freeform Fabrication, Gelation, Rheology

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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