Characterization of temperature-dependent optical material properties of polymer powders
- In former works, the optical material properties of different polymer powders used for Laser Beam Melting (LBM) at room temperature have been analyzed. With a measurement setup using two integration spheres, it was shown that the optical material properties of polymer powders differ significantly due to multiple reflections within the powder compared to solid bodies of the same material. Additionally, the absorption behavior of the single particles shows an important influence on the overall optical material properties, especially the reflectance of the powder bed. Now the setup is modified to allow measurements at higher temperatures. Because crystalline areas of semi-crystalline thermoplastics are mainly responsible for the absorption of the laser radiation, the influence of the temperature increase on the overall optical material properties is analyzed. As material, conventional polyamide 12 and polypropylene as new polymer powder material, is used. By comparing results at room temperature and at higher temperatures towards the melting point, the temperature-dependent optical material properties and their influence on the beam-matter interaction during the process are discussed. It is shown that the phase transition during melting leads to significant changes of the optical material properties of the analyzed powders.
Author: | Tobias LaumerORCiDGND, Thomas Stichel, Thomas BockORCiD, Philipp AmendGND, Michael Schmidt |
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DOI: | https://doi.org/10.1063/1.4918508 |
Parent Title (German): | AIP Conference Proceedings |
Publisher: | AIP Publishing |
Document Type: | conference proceeding (article) |
Language: | English |
Year of first Publication: | 2014 |
Release Date: | 2022/11/25 |
Tag: | Optical Material Properties; Polymers; laser beam melting; material qualification |
Issue: | 1 |
Article Number: | 160001 |
Konferenzangabe: | International Conference of The Polymer Processing Symposium, 2015, Cleveland |
Institutes: | Fakultät Maschinenbau |
Fakultät Maschinenbau / Labor Additive and Intelligent Manufacturing for Sustainability (AIMS) | |
Publication: | Externe Publikationen |
research focus: | Produktion und Systeme |
Licence (German): |