2003 / Solid Freeform Fabrication Proceedings
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Author Scott Johnston (1, 2), Rhonda Anderson (1, 2) and Duane Storti (1),; (1) Dept. of Mechanical Engineering, University of Washington, Seattle, WA 98195-2600; (2) Concurrent Technologies Corporation, Bremerton, WA 98312; author to whom correspondence should be addressed.
Source Solid Freeform Fabrication Proceedings, 2003, pp 536-547.
Abstract Three-dimensional printing (3DP TM) is a layer-by-layer manufacturing process whereby a three-dimensional (3D) component is created by the distribution of a liquid binder onto a powder media. A 3DP (TM) process using stainless steel powder as its printing media requires post--printing thermal processing for debinding and sintering of the printed green component. To minimize dimensional distortion while increasing structural integrity of the green component, 3DP (TM) thermal post-processing is designed to produce only neck growth between particles, defined as initial stage sintering.
The accepted theoretical model governing initial stage sintering strain for spherical powder particles provides a qualitative account of strain development with respect to time and temperature variance;however, the model does not produce an accurate quantitative account for the magnitude of the strain when compared to dimensional experimental results. The theoretical model indicates that powder particle size is the dominant parameter governing sintering strain. The purpose of this study is to introduce an effective particle size into the theoretical model, thus enabling the application of the theoretical model to estimate dimensional change for components produced by 3DP (TM). Dimensional sintering experimentation has been performed using 3DP (TM) test specimens with spherical powder particles having mean diameters of 20 um, 80 um, and 200 um. Experimental results and progress on the theoretical model are discussed. (Auth abstract) [References: 8] 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