2003 / Solid Freeform Fabrication Proceedings
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Author Brian D. Kernan, Emanuel M. Sachs Department of Mechanical Engineering Mark A Oliveira, Michael J. Cima Department of Materials Science &Engineering Massachusetts Institute of Technology Cambridge, MA 02139
Source Solid Freeform Fabrication Proceedings, 2003, pp 616-631.
Abstract Tungsten Carbide 10 wt%Cobalt parts were formed by Slurry-based Three Dimensional Printing (3DP TM) . The slurry contained a mixture of Tungsten Carbide and Cobalt Oxide powders, as well as dispersing and redispersing agents. The cobalt oxide is fully reduced to cobalt metal during the early stages of the sintering process. A new binder system, polyethylenimine, is described for use with powders with acidic surfaces, such as WC. Sintered densities approach the theoretical values for WC-10%Co, and the microstructures produced are similar to those of conventionally processed (press and sinter) materials. Up to four parts were produced in a single print run using a layer thickness of 25 Pm, with good dimensional agreement between them, and within the range of target dimensions after sintering. (Auth abstract) [References: 26] XX
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu