2003 / Solid Freeform Fabrication Proceedings
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Author Pranav Kumar, Elizabeth Beck and Suman Das Department of Mechanical Engineering The University of Michigan, Ann Arbor
Source Solid Freeform Fabrication Proceedings, 2003, pp 82-92.
Abstract A concept for multi-material solid freeform fabrication is proposed to enable the fabrication of heterogeneous components. This concept features nozzles designed for depositing thin layers of multiple patterned materials followed by selective laser sintering for consolidation to desired densities. Although prior work on the design of small-scale nozzles for powder delivery is lacking, our design is guided by background theory for particle flow through hoppers. Experimental guidelines for the delivery of powders with particle sizes in the 10-125 um range through hopper-nozzle orifices with diameters in the 0. 5-2mm range are presented. This is a preliminary investigation of particle flow behavior necessary for continuous mass flow rates under gravity, low gas pressure-assisted flow, and vibration-assisted flow conditions. As proof of concept, several patterned beds of single and multiple materials were deposited on an X-Y table. A simple model to predict the linewidth of lines deposited by gravity flow is presented. (Auth abstract) [References: 12] 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