1999 / Solid Freeform Fabrication Proceedings
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Author James, E. Crocker, Lianchao Sun, Helene Ansquer, Leon L. Shaw, Harris L. Marcus, The University of Connecticut at Storrs
Source Solid Freeform Fabrication Proceedings, 1999, pp 495-502
Abstract Selective Area Laser Deposition Vapor Infiltration (SALDVI) ceramic structures and composites are fabricated by the localized chemical vapor infiltration of powder layers. A matrix of vapor deposited ceramic material is selectively deposited from gas precursors into a bed of ceramic powder particles using laser heating. An important aspect of the SALDVI process for building 3-D structures is the depth of penetration of the infiltration zone into the powder layer. The infiltration behavior of vapor deposited silicon carbide from tetramethylsilane gas was investigated for a range of ceramic powders with different optical, thermal, and physical properties using image analysis. The porosity distribution in the silicon carbide matrix SALDVI structure was found to vary with particle size and particle material. These results will be used to guide experiments on the effect of layer thickness on the microstructure of multiple layer SALDVI composites. (Auth abstract) [References: 11]
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