Journal
POWDER TECHNOLOGY
Volume 286, Issue -, Pages 151-155Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2015.08.004
Keywords
Laser sintering; Powder flow; Powder spreader; Polymers; Powder characterisation
Categories
Funding
- IWT
- SIM-Flanders
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A need exists for techniques to assess flow properties of powders intended for laser sintering (LS). Although several powder flow measurement techniques are available, the flowability of a powder is strongly dependent on the nature of the applied flow field and none of the currently availably techniques adopt the flow field of LS. Therefore, this paper proposes a new technique, which mimics the flow in an LS machine, allowing a more appropriate powder flow evaluation for this particular process. The set-up provides qualitative assessment of powder layer smoothness, as well as a quantitative determination of the packing density of the deposited layer. Measurements on PA12, spherical PS and PMMA, and cryogenically milled TPU powders demonstrate the set-up's capability to evaluate powder flow with regard to LS. (C) 2015 Elsevier B.V. All rights reserved.
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