scholarly journals Modeling crystallization kinetics for selective laser sintering of polyamide 12

2021 ◽  
Author(s):  
Dominic Soldner ◽  
Paul Steinmann ◽  
Julia Mergheim
Keyword(s):  
Crystallization Kinetics ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

scholarly journals Crystallization Kinetics of Polyamide 12 during Selective Laser Sintering

Polymers ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 168 ◽  
Author(s):  
◽  
◽  
Keyword(s):  
Crystallization Kinetics ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12 ◽  
Kinetics Of

Study in performance and morphology of polyamide 12 produced by selective laser sintering technology

2018 ◽  
Vol 24 (5) ◽  
pp. 813-820 ◽  
Author(s):  
Junjie Wu ◽  
Xiang Xu ◽  
Zhihao Zhao ◽  
Minjie Wang ◽  
Jie Zhang
Keyword(s):  
Selective Laser Sintering ◽  
Polarized Light ◽  
Chain Scission ◽  
High Energy ◽  
Laser Sintering ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Content Type ◽  
X Ray ◽  
Polyamide 12

Purpose The purpose of this paper is to investigate the effect of selective laser sintering (SLS) method on morphology and performance of polyamide 12. Design/methodology/approach Crystallization behavior is critical to the properties of semi-crystalline polymers. The crystallization condition of SLS process is much different from others. The morphology of polyamide 12 produced by SLS technology was investigated using scanning electron microscopy, polarized light microscopy, differential scanning calorimetry, X-ray diffraction and wide-angle X-ray diffraction. Findings Too low fill laser power brought about bad fusion of powders, while too high energy input resulted in bad performance due to chain scission of macromolecules. There were three types of crystal in the raw powder material, denoted as overgrowth crystal, ring-banded spherulite and normal spherulite. Originality/value In this work, SLS samples with different sintering parameters, as well as compression molding sample for the purpose of comparison, were made to study the morphology and crystal structure of sintered PA12 in detail.

Crystallization kinetics of polyetheretherketone during high temperature-selective laser sintering

2020 ◽  
Vol 36 ◽  
pp. 101615 ◽  
Author(s):  
Peng Chen ◽  
Haosong Cai ◽  
Zhaoqing Li ◽  
Maoyuan Li ◽  
Hongzhi Wu ◽  
...  
Keyword(s):  
High Temperature ◽  
Crystallization Kinetics ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Kinetics Of

Preparation, characterisation and processing of carbon fibre/polyamide-12 composites for selective laser sintering

2011 ◽  
Vol 71 (16) ◽  
pp. 1834-1841 ◽  
Author(s):  
Chunze Yan ◽  
Liang Hao ◽  
Lin Xu ◽  
Yusheng Shi
Keyword(s):  
Carbon Fibre ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

Pre-processing studies for selective laser sintering of glass beads-filled polyamide 12 composites

2014 ◽  
Vol 4 (1) ◽  
pp. 28 ◽  
Author(s):  
Alkhair A. Mousa ◽  
Duc T. Pham ◽  
Soe P. Shwe
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Glass Beads ◽  
Polyamide 12

scholarly journals Selective laser sintering of copper filled polyamide 12: Characterization of powder properties and process behavior

2018 ◽  
Vol 40 (5) ◽  
pp. 1801-1809 ◽  
Author(s):  
Lydia Lanzl ◽  
Katrin Wudy ◽  
Sandra Greiner ◽  
Dietmar Drummer
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12 ◽  
Process Behavior ◽  
Powder Properties

scholarly journals Hybrid Approaches for Selective Laser Sintering by Building on Dissimilar Materials

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5285
Author(s):  
Babette Goetzendorfer ◽  
Thomas Mohr ◽  
Ralf Hellmann
Keyword(s):  
Substrate Surface ◽  
Selective Laser Sintering ◽  
Dissimilar Materials ◽  
Polyamide 6 ◽  
Laser Sintering ◽  
New Approach ◽  
Metallic Substrates ◽  
Polyamide 12 ◽  
Melting Temperatures ◽  
Hybrid Approaches

We introduced a new approach in selective laser sintering for hybrid multicomponent systems by fabricating the sintered polyamide 12 (PA12) part directly onto a similar (PA12) or dissimilar (polyamide 6 (PA6) and tool steel 1.2709) joining partner. Thus, the need for adhesive substances or joining pressure was completely circumvented, leading to the possibility of pure hybrid lightweight bi-polymer or metal–polymer systems. By taking advantage of the heating capabilities of the sinter laser regarding the substrate surface, different exposure strategies circumvented the lack of overlapping melting temperatures of dissimilar polymers. Therefore, even sintering on non-PA12 polymers was made possible. Finally, the transfer on metallic substrates—made up by selective laser melting (SLM)—was successfully performed, closing the gap between two powder-based additive processes, selective laser sintering (SLS) and SLM.

Surface roughness of polyamide 12 parts manufactured using selective laser sintering

2019 ◽  
Vol 80 ◽  
pp. 106094 ◽  
Author(s):  
Sean Petzold ◽  
James Klett ◽  
Andrew Schauer ◽  
Tim A. Osswald
Keyword(s):  
Surface Roughness ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Polyamide 12

scholarly journals Analysis of Tribo-Charging during Powder Spreading in Selective Laser Sintering: Assessment of Polyamide 12 Powder Ageing Effects on Charging Behavior

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 609 ◽  
Author(s):  
Nicolas Hesse ◽  
Maximilian Dechet ◽  
Juan Bonilla ◽  
Christian Lübbert ◽  
Stephan Roth ◽  
...  
Keyword(s):  
Selective Laser Sintering ◽  
Electrostatic Charge ◽  
Laser Sintering ◽  
Process Stability ◽  
Polyamide 12 ◽  
Part Quality ◽  
Polymer Powder ◽  
Novel Approach ◽  
Powder Flowability ◽  
Model Setup

Powder flowability is key to achieving high process stability and part quality by application of smooth and dense layers in selective laser sintering (SLS). This study sheds light on the rarely investigated effect of tribo-electric charge build-up during powder delivery in the SLS process. This is achieved by a novel approach to quantify electrostatic potentials during doctor blading. The presented model setup is used in combination with charge spectrometry and impedance spectroscopy to investigate the alterations in tribo-electric charging behavior for the most commonly used laser sintering material polyamide 12 in its virgin and aged, c.f. reused, states. We show that the electrostatic charge build-up is significantly enhanced for aged polymer powder material, likely contributing to altered performance in SLS processing.

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