1995 / Solid Freeform Fabrication Proceedings
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47. Solid Freeform Fabrication of Silicon Nitride Shapes by Selective Laser Reaction Sintering (SLRS)

Author B.R. Birmingham (a), H.L. Marcus (a), (a) The University of Texas at Austin, (b) University of Connecticut

Source Solid Freeform Fabrication Proceedings, 1995, pp 389-396

Abstract Selective Laser Reaction Sintering is a variation of selective laser sintering, (SLS) that incorporates an in-situ reaction under the scanned beam to fabricate shapes from materials not directly accessible by traditional SLS. This paper describes an investigation into the production of silicon nitride (Si3N4) shapes by laser sintering silicon powder in an ammonia (NH3) atmosphere. The effect of gas pressure and the importance of gas/laser interactions are discussed. Single and multiple layer shapes are fabricated. The material is analyzed by x-ray diffraction spectroscopy (XRDS) for phase content and scanning electron microscopy (SEM) for macrostructure. Data is presented that demonstrates conversion rates from silicon to silicon nitride on the order of 85%. (Auth abstract) [References: 8]

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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