2000 / Solid Freeform Fabrication Proceedings
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Author S. J. Rodrigues, R.P. Chartoff, D.A. Klosterman, M. Agarwala, and N. Hecht The University of Dayton Rapid Prototype Development Laboratory Dayton, Ohio 45469-0130 USA
Source Solid Freeform Fabrication Proceedings, 2000, pp 1-8
Abstract The processing of silicon nitride (Si3N4) structural ceramics by Laminated Object Manufacturing (LOM) using ceramic tape preforms was investigated. The key processing stages involved green shape formation (which used the LOM process), followed by the burnout of all organics, and final densification by pressureless sintering. Two material systems were considered. These were a) monolithic Si3N4 and b) a preceramic polymer infiltrated Si3N4. The raw materials for the process were tape preforms of Si3N4, which were fabricated by standard tape casting techniques. Mechanical property data obtained for the LOM processed Si3N4 showed high strength and fracture toughness values. The room temperature and high temperature (1260 o C) flexural strengths were in the range of 700-900 MPa and 360-400 MPa, respectively. The fracture toughness averaged from 5.5-7.5 MPa.m 1/2 . These strength and fracture toughness values are comparable to those reported for conventionally prepared Si3N4 ceramics. Thus, this researc h demonstrated that the LOM technique is a viable method for preparing functional Si3N4 ceramics with good physical and mechanical properties. (Auth abstract) [References: 10]
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