1999 / Solid Freeform Fabrication Proceedings
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Author S. Kang (a), A. G. Cooper (a), J. Stampfl (a), F. Prinz (a), J. Lombardi (b), L. Weiss (c), J. Sherbeck (d), (a) Stanford University, (b) Advanced Ceramics Research, (c) Carnegie Mellon University, (d) M-DOT Inc
Source Solid Freeform Fabrication Proceedings, 1999, pp 427-434
Abstract Mold Shape Deposition Manufacturing (Mold SDM) is being developed in order to fabricate complex structural ceramic parts such as components for miniature turbine engines. For this application, the ceramic parts must not only be strong, but they also must have high dimensional accuracy and superior surface quality. This paper presents current progress with process development and characterizes fabricated silicon nitride (Si3N4) parts including their surface quality, part density, isotropic shrinkage and build rate. The microstructure of the sintered parts has been characterized. Mechanical testing gave flexural strength values ranging from 400 to 800 MPa. The isotropic linear shrinkage of 18+ - 0.5% and best RMS surface roughness of 0.45 micron was observed. A number of process improvements that lead to better quality parts will also be described. (Auth abstract) [References: 5]
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