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 (R mix) and tip diameter (t d) for the chamber and paddle geometry utilized. These data were used to establish processing maps that identify optimal print conditions for varying suspension composition.
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References
J. Cesarano III, Thomas Baer and P. Calvert, “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).
J. Cesarano III, B.H. King and H. Denham, “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).
S.L. Morissette and J.A. Lewis, “Chemorheology of Aqueous Alumina-Poly(vinyl alcohol) Gelcasting Suspensions,” J. Am. Ceram. Soc., (in print).
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Morissette, S.L., Lewis, J.A., Cesarano, J. et al. Solid Freeform Fabrication using Alumina-Poly(Vinyl Alcohol) Gel-Casting Suspensions. MRS Online Proceedings Library 542, 125–130 (1998). https://doi.org/10.1557/PROC-542-125
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DOI: https://doi.org/10.1557/PROC-542-125