Selective laser melting using holographic beam manipulation: influence of polypropylene molecular weight
| Autor: | Zhou Zhou, B. Haworth, John R. Tyrer |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Polypropylene
chemistry.chemical_classification 0209 industrial biotechnology Thermogravimetric analysis Materials science Rheometry Mechanical Engineering Sintering 02 engineering and technology Polymer 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Oxidative-induction time chemistry.chemical_compound 020901 industrial engineering & automation Differential scanning calorimetry chemistry Selective laser melting Composite material 0210 nano-technology |
| Zdroj: | Rapid Prototyping Journal. 24:93-105 |
| ISSN: | 1355-2546 |
| DOI: | 10.1108/rpj-08-2016-0134 |
| Popis: | Purpose There is a requirement to match selective laser melting (SLM) technologies to a wider range of polymeric materials, as the existing market for SLM powders is dominated by polyamide PA12. Drivers include the tailoring of physical properties to individual applications or cost reduction. Polypropylene (PP) currently has limited use in SLM; so, this paper aims to explore the potential use of PP materials of varying molecular weight (Mw). Design/methodology/approach PP polymers of differing Mw were characterised using a range of analytical techniques, including differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), rotational rheometry and real-time hot-stage (optical) microscopy. Findings The techniques are sufficiently sensitive to distinguish Mw effects, notably in terms of material viscosity. The stable sintering region for SLM has been defined clearly. Some success was achieved in melting parts using all grades of PP, including higher Mw grades, which potentially offer improved mechanical performance. Research limitations/implications The range of techniques (DSC, oxidative induction time and TGA) form an effective analytical package with which to consider new polymeric materials for SLM. Practical implications High-Mw PP polymers, in tape or powder form, have potential use in SLM processes, providing scope to enhance part properties in future. Originality/value This is believed to be the first in-depth study noting the influence of PP Mw on important physical performance in a proprietary SLM process, using holographic beam manipulation. |
| Databáze: | OpenAIRE |
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