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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Weinhart, Thomas
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Densification of visco-elastic powders during free and pressure-assisted sinteringcitations
- 2022Visco-elastic sintering kinetics in virgin and aged polymer powderscitations
- 2021Neck growth kinetics during polymer sintering for powder-based processescitations
- 2019Sintering—Pressure- and Temperature-Dependent Contact Modelscitations
- 2017Initial stage sintering of polymer particles - Experiments and modelling of size-, temperature- and time-dependent contactscitations
- 2017From soft and hard particle simulations to continuum theory for granular flows
- 2017Multiscale modelling of agglomeration
- 2016Sintering of polymer particles
Places of action
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article
Initial stage sintering of polymer particles - Experiments and modelling of size-, temperature- and time-dependent contacts
Abstract
<p>The early-stage sintering of thin layers of micron-sized polystyrene (PS) particles, at sintering temperatures near and above the glass transition temperature T<sub>g</sub> (∼100°C), is studied utilizing 3D tomography, nanoindentation and confocal microscopy. Our experimental results confirm the existence of a critical particle radius (r<sub>crit</sub> ∼1 μm) below which surface forces need to be considered as additional driving force, on top of the usual surfacetension driven viscous flow sintering mechanism. Both sintering kinetics and mechanical properties of particles smaller than r<sub>crit</sub> are dominated by contact deformation due to surface forces, so that sintering of larger particles is generally characterized by viscous flow. Consequently, smaller particles require shorter sintering. These experimental observations are supported by discrete particle simulations that are based on analytical models: for small particles, if only viscous sintering is considered, the model under-predicts the neck radius during early stage sintering, which confirms the need for an additional driving mechanism like elastic-plastic repulsion and surface forces that are both added to the DEM model.</p>