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Titanium alloy powder preparation for selective laser sintering

B. Engel (IBM Analytical Services, Hopewell Junction, New York, USA)
D.L. Bourell (Texas Materials Institute, Laboratory for Freeform Fabrication, The University of Texas at Austin, Austin, Texas, USA)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 1 June 2000

Abstract

Selective laser sintering (SLS) is a solid freeform fabrication process whereby a part is built layerwise by scanning a powder bed. The processability of metal powder varies depending on the state of the powder prior to SLS. A powder thermal pre‐treatment was developed which involved degassing the powder at an elevated temperature in a vacuum. Without powder thermal pre‐treatment, the powder may flow poorly and may “ball” or form molten clumps during the laser exposure rather than wetting into the present and previous layer. These effects result in SLS parts with poor surface finish, mechanical properties and density. The purpose of this study was to identify for titanium alloy powder the mechanisms responsible for the improvements obtained after powder thermal pre‐treatment and to optimize the thermal excursion.

Keywords

Citation

Engel, B. and Bourell, D.L. (2000), "Titanium alloy powder preparation for selective laser sintering", Rapid Prototyping Journal, Vol. 6 No. 2, pp. 97-106. https://doi.org/10.1108/13552540010323574

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MCB UP Ltd

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