2003 / Solid Freeform Fabrication Proceedings
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Author Jiwen Wang, Leon L. Shaw, Harris L. Marcus Department of Metallurgy and Materials Engineering Institute of Materials Science University of Connecticut, Storrs, CT 06269 T. B. Cameron Dentsply Ceramco Burlington, NJ 08016
Source Solid Freeform Fabrication Proceedings, 2003, pp 392-399.
Abstract This study investigates the dependence of the cross section geometry of extruded dental porcelain slurries on the rheological property of the slurry and the extrusion conditions. It is found that a pseudoplastic slurry is a basic requirement for obtaining extruded lines with rectangular cross sections. The cross section geometry of the extrudate is also strongly affected by extrusion parameters including the extrusion nozzle height, nozzle moving speed, and extrusion rate. Proper combinations of these extrusion parameters are necessary in order to obtain extrudates with near rectangular cross sections. The results obtained have been explained in terms of the interactions among the rheological properties of the slurry, the shear rate imposed on the slurry during extrusion, the wettability of the slurry on the substrate, and the forced flow of the slurry during extrusion. Keywords:Slurry extrusion, dental porcelain, rheology of slurry, solid freeform fabrication (Auth abstract) [References: 14] 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