1995 / Solid Freeform Fabrication Proceedings
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Author B. Badrinarayan, J.W. Barlow The University of Texas at Austin
Source Solid Freeform Fabrication Proceedings, 1995, pp 55-63
Abstract This paper describes the effect of processing parameters in SLS of metal-polymer powder mixtures. Test bars for measurement of strength and density were made from copper-PMMA powder mixtures using SLS. The effect of Energy Density during laser processing, effect of vector length, bed temperature, polymer melt index and initial binder content on part strength and density are discussed in this paper. The green part strengths and densities were found to increase with Energy Density upto a value of 6.0 cal/cm2 and then they drop off due to polymer degradation. Parts made with lower vector lengths yielded higher strengths and densities than those with higher vector lengths. Parts processed with a low melt index polymer binder (around 6.0 gm/ 10min) showed higher strengths than parts processed with higher melt index binders . High strength values were obtained for green parts made from powders that had a greater initial binder content. Bed temperature did not have a very significant effect on part strength and densities. (Auth abstract) [References: 8]
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