Evaluation of particle coalescence and its implications in laser sintering

Benedetti, L.; Brûlé, B; Decraemer, N.; Evans, K.; Ghita, Oana

doi:10.1016/j.powtec.2018.10.053

Cited by 26 publications

(16 citation statements)

References 27 publications

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“…This seems to be mostly an effect of heating applied to the system rather than flattening of the particles on the glass surface. This is supported by [26], which reports that neck growth of PAEKs is not significantly affected by the contact of the glass surface with the pair of particles in analysis. This was experimentally assessed by comparing neck growth of a pair of particles on glass blades and on glass coated with silicone based separator spray which prevents wettability.…”

Section: Resultssupporting

confidence: 64%

“…All the curves in Figure 4 are non-dimensionalised using an averaged equivalent diameter defined as R eqv (0) = (14π) − 1 7 n=1 P n (0) = 33.95 µm, where P n (0) is the initial perimeter of particle n (1 ≤ n ≤ 7). This is equivalent to the neck growth assessment procedure "N3" which is proposed in [26] and is found to significantly reduce the standard deviation in the experimental measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The pictures were captured every 2s, hence in an interval of 4 • C per picture, with the assistance of DinoCapture 2.0 software. The particles were placed on glass slides, following most of the experimental studies with HSM in literature [24,26,27]. The images were treated and analysed using ImageJ software.…”

Section: Methodsmentioning

confidence: 99%

“…The temperature at which neck is formed was selected as the starting point followed by 10 subsequent pictures captured in an interval of 20 seconds between neck formation and the end of the analysis. The analysis of individual particles used perimeter and aspect ratio values, and neck growth used perimeter values following the methodology described in [26].…”

Section: Methodsmentioning

confidence: 99%

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Effects of particle elongation on the binary coalescence dynamics of powder grains for Laser Sintering applications

2020

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effects of particle elongation on the binary coalescence dynamics of powder grains for Laser Sintering applications

2020

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“…Further modifications to Frenkel's model pointed at the limitations of the Newtonian flow assumption, observing that the measured coalescence rate in semi-crystalline materials is often lower than predicted. This might also depend on shrinkage of individual particles before melting, which causes a delay in the coalescence rate [113]. Bellehumeur et al [114] proposed an integration of the term related to viscous dissipation in order to include the viscoelastic behaviour of polymers.…”

Section: Rt à ámentioning

confidence: 99%

Laser-based additively manufactured polymers: a review on processes and mechanical models

et al. 2020

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Additive manufacturing (AM) is a broad definition of various techniques to produce layer-by-layer objects made of different materials. In this paper, a comprehensive review of laser-based technologies for polymers, including powder bed fusion processes [e.g. selective laser sintering (SLS)] and vat photopolymerisation [e.g. stereolithography (SLA)], is presented, where both the techniques employ a laser source to either melt or cure a raw polymeric material. The aim of the review is twofold: (1) to present the principal theoretical models adopted in the literature to simulate the complex physical phenomena involved in the transformation of the raw material into AM objects and (2) to discuss the influence of process parameters on the physical final properties of the printed objects and in turn on their mechanical performance. The models being presented simulate: the thermal problem along with the thermally activated bonding through sintering of the polymeric powder in SLS; the binding induced by the curing mechanisms of light-induced polymerisation of the liquid material in SLA. Key physical variables in AM objects, such as porosity and degree of cure in SLS and SLA respectively, are discussed in relation to the manufacturing process parameters, as well as to the mechanical resistance and deformability of the objects themselves. Graphic abstract

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Recent Advances on High‐Performance Polyaryletherketone Materials for Additive Manufacturing

Chen

Wang

et al. 2022

Advanced Materials

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Polyaryletherketone (PAEK) is emerging as an important high‐performance polymer material in additive manufacturing (AM) benefiting from its excellent mechanical properties, good biocompatibility, and high‐temperature stability. The distinct advantages of AM facilitate the rapid development of PAEK products with complex customized structures and functionalities, thereby enhancing their applications in various fields. Herein, the recent advances on AM of high‐performance PAEKs are comprehensively reviewed, concerning the materials properties, AM processes, mechanical properties, and potential applications of additively manufactured PAEKs. To begin, an introduction to fundamentals of AM and PAEKs, as well as the advantages of AM of PAEKs is provided. Discussions are then presented on the material properties, AM processes, processing–matter coupling mechanism, thermal conductivity, crystallization characteristics, and microstructures of AM‐processed PAEKs. Thereafter, the mechanical properties and anisotropy of additively manufactured PAEKs are discussed in depth. Their representative applications in biomedical, aerospace, electronics, and other fields are systematically presented. Finally, current challenges and possible solutions are discussed for the future development of high‐performance AM polymers.

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Evaluation of particle coalescence and its implications in laser sintering

Cited by 26 publications

References 27 publications

Effects of particle elongation on the binary coalescence dynamics of powder grains for Laser Sintering applications

Effects of particle elongation on the binary coalescence dynamics of powder grains for Laser Sintering applications

Laser-based additively manufactured polymers: a review on processes and mechanical models

Recent Advances on High‐Performance Polyaryletherketone Materials for Additive Manufacturing

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