Selective laser melting of polymers: influence of powder coating on mechanical part properties
-
Maximilian Drexler
,
Sandra Greiner
Abstract
For the derivation of part quality increasing process strategies, knowledge about interactions between sub-processes of selective laser melting (SLM) and resulting part properties is necessary. The SLM process consists of three major sub-processes: powder coating, exposure, and material consolidation. According to the interaction of sub-processes, resulting processing conditions during SLM determine the part properties by changing micro structural pore number and distribution. In addition to absolute temperatures, the time-dependency of the thermal fields also influences the porosity of molten parts. Present process strategies tend to decrease building time by acceleration of the subprocesses. Apart from prior investigated acceleration of the exposure, the powder coating step is focused. Within the paper, the authors analyze the basic interactions between different coating parameters and part properties. The authors estimate an interaction between coating speed and resulting part properties due to a force impact caused by the moved coating mechanism. Therefore, specimens produced with different coating speeds are analyzed with imaging technologies as well as mechanical tests. Based on the investigations, new processing strategies can be established considering the forces applied to the powder bed during the coating process, as well as the unique compaction behavior of current and future used powders.
Acknowledgments
The authors want to thank the German Research Foundation (DFG) for funding the Collaborative Research Center 814 (CRC 814) – Additive Manufacturing, sub-project B03.
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©2018 Walter de Gruyter GmbH, Berlin/Boston
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Articles in the same Issue
- Frontmatter
- Material properties
- Effects of nano-silicon dioxide surface modification on the morphology and mechanical properties of ABS/PMMA blends
- Efficient enhancement in polyethylene biodegradation as a consequence of oxidative fragmentation promoted by pro-oxidant/pro-degradant metal stearate
- Some effects of radiation treatment of biodegradable PCL/PLA blends
- Kaolinite dispersion in cassava starch-based composite films: a photonic microscopy and X-ray tomography study
- Preparation and assembly
- Preparation of hydroxyapatite-titanium particle hierarchical filled polyetheretherketone functional gradient biocomposites
- Engineering and processing
- Melt processing of high alcoholysis poly(vinyl alcohol) with different polyol plasticizers
- Selective laser melting of polymers: influence of powder coating on mechanical part properties
- Electrochemical treatment of metal inserts for subsequent assembly injection molding of tight electronic systems
- Polypropylene/polyethylene two-layered by one-step rotational molding
- Analysis of the process influences on injection molded thermosets filled with hollow glass bubbles
- In situ simultaneous measurement of stress, retardation, and three-dimensional refractive indexes during biaxial stretching experiments under various preheating times
