1998 / Solid Freeform Fabrication Proceedings
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Author Bruce H. King, Sher L. Morissette, Hugh Denham, Joseph Cesarano, III, Duane Dimos, Sandia National Laboratories
Source Solid Freeform Fabrication Proceedings, 1998, pp 391-398
Abstract Rheology and deposition behavior of four commercially available thick-film inks and an aqueous alumina slurry were investigated using two different slurry-based deposition systems. The first of these deposition systems, a Micropen, is a commercially available system designed for the deposition of electronic thick film circuits. The second system, referred to as a Robocaster, is a developmental system designed to build thick or structural parts. Slurry rheology was seen to have a minor effect on deposition behavior and the bead shape when deposited using the Micropen. The deposition behavior was instead dominated by drying rate; too rapid of a drying rate led to excessive clogging of the tip. Slurry rheology had a greater impact on the shape of beads deposited using the Robocaster. Highly viscous slurries yielded initially well-defined beads, whereas beads deposited using fluid slurries spread quickly. In both cases, significant spreading occurred with time. These observations only held for slurrie s with slow drying rates. It was observed that very fluid slurries produced well-defined beads when the drying rate was suitably high. (Auth abstract) [References: 3]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
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