| Titre : |
Polymer powders in additive manufacturing : Part 1 : Material-specific influencing factors and assessment of methods |
| Type de document : |
texte imprimé |
| Auteurs : |
Nicole Rapelius, Auteur ; Regina Schreiber, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 45-49 |
| Langues : |
Anglais (eng) |
| Catégories : |
Additifs
Analyse thermique
Enthalpie
Frittage laser
Mesure
Polyamide 12
Polypropylène
Poudres
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The mechanical properties of additively manufactured components can not only be increased by means of improved processing and plant technology. Particularly with laser sintering, a closer look at the polymer powder used is worthwhile. A comprehensive investigation shows why and how such a specific powder qualification has an effect. |
| Note de contenu : |
- Comparison of PA12 and PP
- Selection and development of methods
- Selected polymer powders
- Comparison of five selected measurement methods
- Fig. :Figures including supporting material: laser sintering of components is a highly promising additive production method. Material qualifications for plastic powder determine the properties of the printed components
- Fig. 1 : CAD data of the additively manufactured measuring cup for determining powder flowability using the Hausner ratio; dimensions in millimeters
Fig.2. : Microscopy images of selected laser sintering powders: new PA powder, 23°C/50 % RH; aged PA powder, 23°C/50 % RH - PP1 and PP2 are new powders from different producers, both with 23°C/50%
- Fig. 3 : Volume distribution of particle sizes using the characteristic D10, D50, and D90 values. In each case10%, 50%, and 90 % of the particles are smaller than the specified diameter
- Fig. 4 : Low Hausner ratio values imply less loss of volume during tapping, which indicates the powder to be more flowable
- Fig. 5 : Due to the longer molecular chains caused by post-condensation reactions, it is possible to clearly determine aged powder by means of the averaged melt volume flow rate (MVR)
- Fig. 6 : The results of gel permeation chromatography (molecular weight distribution) serve to determine new and aged PA12 powder
- Fig. 7 : DSC curves of new PA powder, 23 °C/50 96 RH (left) and new polypropylene (PP1) powder, 23 °C/50 96 RH (right) with marked sintering window area. The clearly larger sintering window currently recommends PA
- Fig. 8 : Measured enthalpy values for first melting and crystallization
- Table 1 : Measuring equipment and testing parameters used for characterizing the polymer powder
- Table 2 : |
| En ligne : |
https://drive.google.com/file/d/1G2pHcl7_HPUrB0MIsZdq7q7BXAQJMdI6/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31109 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 8 (08/2018) . - p. 45-49
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