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

Conference contribution
(Conference Contribution)


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
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.



FAU Authors / FAU Editors

Drexler, Maximilian
Sonderforschungsbereich 814 Additive Fertigung
Drummer, Dietmar Prof. Dr.-Ing.
Lehrstuhl für Kunststofftechnik
Kloos, Stephanie
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Peukert, Wolfgang Prof. Dr.-Ing.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Sachs, Marius
Technische Fakultät
Wudy, Katrin Dr.-Ing.
Sonderforschungsbereich 814 Additive Fertigung
Zhao, Meng
Sonderforschungsbereich 814 Additive Fertigung


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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Last updated on 2018-19-04 at 03:46