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Solid Freeform Fabrication using Alumina-Poly(Vinyl Alcohol) Gel-Casting Suspensions

Published online by Cambridge University Press:  10 February 2011

S. L. Morissette,
J. A. Lewis,
J. Cesarano and
D. B. Dimos
S. L. Morissette
Affiliation:
University of Illinois, 105 S. Goodwin Ave., Urbana, IL 61801
J. A. Lewis
Affiliation:
University of Illinois, 105 S. Goodwin Ave., Urbana, IL 61801
J. Cesarano
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185-1411 USA
D. B. Dimos
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185-1411 USA
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Abstract

Solid freeform fabrication of aqueous alumina (Al2O3)-poly(vinyl alcohol) (PVA) gelcasting suspensions was carried out using a computer-controlled extrusion apparatus fitted with a two-nozzle delivery system. The impact of casting parameters (e.g., tip diameter, mixing rate, etc.) and suspension composition on line resolution/uniformity, printability, and as-cast component properties was probed using laser profilometry and optical microscopy. Line uniformity depended on mixing rate (Rmix ) and tip diameter (td ) for the chamber and paddle geometry utilized. These data were used to establish processing maps that identify optimal print conditions for varying suspension composition.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 542: Symposium V – Solid Freeform and Additive Fabrication , 1998, 125
Copyright
Copyright © Materials Research Society 1999

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References

1. Cesarano, J. III, Thomas, Baer and Calvert, P., “Recent Developments in Freeform Fabrication of Dense Ceramic from Slurry Deposition,” p. 25–32 in Solid Freeform Fabrication Symposium Proceedings. Austin, TX: University of Texas at Austin (1997).Google Scholar
2. Cesarano, J. III, King, B.H. and Denham, H., “Recent Developments in Robocasting of Ceramics and Multimaterial Deposition,” p. 697–703 in Solid Freeform Fabrication Symposium Proceedings. Austin, TX: University of Texas at Austin (1998).Google Scholar
3. Morissette, S.L. and Lewis, J.A., “Chemorheology of Aqueous Alumina-Poly(vinyl alcohol) Gelcasting Suspensions,” J. Am. Ceram. Soc., (in print).Google Scholar