Conference contribution
(Conference Contribution)


A novel process for production of spherical PBT powders and their processing behavior during laser beam melting


Publication Details
Author(s): Schmidt J, Sachs M, Zhao M, Fanselow S, Wudy K, Drexler M, Drummer D, Wirth KE, Peukert W
Publisher: American Institute of Physics Inc.
Publication year: 2016
Volume: 1713
Conference Proceedings Title: 31st International Conference of the POLYMER PROCESSING SOCIETY
ISBN: 9780735413603

Event details
Event: 31st International Conference of the Polymer Processing Society, PPS 2015
Event location: Jeju Island Korea
Start date of the event: 07/06/2015
End date of the event: 11/06/2015
Language: English

Abstract

Additive manufacturing processes like laser beam melting of polymers are established for production of prototypes and individualized parts. The transfer to other areas of application and to serial production is currently hindered by the limited availability of polymer powders with good processability. Within this contribution a novel process route for the production of spherical polymer micron-sized particles of good flowability has been established and applied to produce polybutylene terephthalate (PBT) powders. Moreover, the applicability of the PBT powders in selective laser beam melting and the dependencies of process parameters on device properties will be outlined. First, polymer micro particles are produced by a novel wet grinding method. To improve the flowability the produced particles the particle shape is optimized by rounding in a heated downer reactor. A further improvement of flowability of the cohesive spherical PBT particles is realized by dry coating. An improvement of flowability by a factor of about 5 is achieved by subsequent rounding of the comminution product and dry-coating as proven by tensile strength measurements of the powders. The produced PBT powders were characterized with respect to their processability. Therefore thermal, rheological, optical and bulk properties were analyzed. Based on these investigations a range of processing parameters was derived. Parameter studies on thin layers, produced in a selective laser melting system, were conducted. Hence appropriate parameters for processing the PBT powders by laser beam melting, like building chamber temperature, scan speed and laser power have been identified.



How to cite
APA: Schmidt, J., Sachs, M., Zhao, M., Fanselow, S., Wudy, K., Drexler, M.,... Peukert, W. (2016). A novel process for production of spherical PBT powders and their processing behavior during laser beam melting. In 31st International Conference of the POLYMER PROCESSING SOCIETY. Jeju Island Korea, KR: American Institute of Physics Inc..

MLA: Schmidt, Jochen, et al. "A novel process for production of spherical PBT powders and their processing behavior during laser beam melting." Proceedings of the 31st International Conference of the Polymer Processing Society, PPS 2015, Jeju Island Korea American Institute of Physics Inc., 2016.

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