Processing and characterizations of 2%PF/silica sand core–shell composite powders by selective laser sintering with a higher transmittance fiber laser

Liu, F.R.; Zhao, Junhua; Zhang, Q.; He, Chao; Chen, J.M.

doi:10.1016/j.ijmachtools.2012.05.003

Cited by 17 publications

(10 citation statements)

References 23 publications

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“…With a set of optimized parameters (laser power of 7 W, scanning speed of 400 mm/s, and laser beam spot of 50 μm), a compressive strength of 0.8 MPa was obtained. This strength was equivalent to that of sand patterns made by the common method and exhibiting strengths in the range 0.5-2.5 MPa [46].…”

Section: Exemplar Ii: Silica (Sio 2 )mentioning

confidence: 75%

“…A common practice is to use laser energy density E ¼ p vh (J/mm 2 ) [8,43] or volumetric energy density p vhd (J/mm 3 ) [27,44], or p vσd (J/mm 3 ) [45], to represent the laser heating effect, where E is the energy density and d is the layer thickness. Sometimes line energy ϕ ¼ p v (J/mm) has been used instead [46].…”

Section: Laser Power (P) Scanning Speed (V) Hatch Distance (H) Andmentioning

confidence: 99%

“…Liu et al exhibited the indirect SLS process with a short wavelength laser, and it also showed the relation between laser line energy and porosity, mechanical strength, and shrinkage depth of the manufactured parts. They reported the indirect laser sintering on polymer coated silica sand composite powders using a 1.064 μm laser [46]. The silica sand they used mainly consisted of SiO 2 99%, Al 2 O 3 0.22% and micro-content of TiO 2 with a melting point of 1750 C [46].…”

Section: Exemplar Ii: Silica (Sio 2 )mentioning

confidence: 99%

“…They reported the indirect laser sintering on polymer coated silica sand composite powders using a 1.064 μm laser [46]. The silica sand they used mainly consisted of SiO 2 99%, Al 2 O 3 0.22% and micro-content of TiO 2 with a melting point of 1750 C [46]. The silica sand was coated with 1.9-2.1 wt.% of phenol-formaldehyderesin (PF).…”

Section: Exemplar Ii: Silica (Sio 2 )mentioning

confidence: 99%

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Processing Parameters for Selective Laser Sintering or Melting of Oxide Ceramics

Zhang¹,

LeBlanc²

2018

Additive Manufacturing of High-Performance Metals and Alloys - Modeling and Optimization

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In this chapter, we present a detailed introduction to the factors which influence laser powder bed fusion (LPBF) on oxide ceramics. These factors can be in general divided in three main categories: laser-related factors (wavelength, power, scanning speed, hatch distance, scan pattern, beam diameter, etc.), powder-and material-related factors (flowability, size distribution, shape, powder deposition, thickness of deposited layers, etc.), and other factors (pre-or post-processing, inert gas atmosphere, etc.). The process parameters directly affect the amount of energy delivered to the surface of the thin layer and the energy density absorbed by the powders; therefore, decide the physical and mechanical properties of the built parts, such as relative density, porosity, surface roughness, dimensional accuracy, strength, etc. The parameter-property relation is hence reviewed for the most studied oxide ceramic materials, including families from alumina, silica, and some ceramic mixtures. Among those parameters, reducing temperature gradient which decreases the thermal stresses is one of the key factors to improve the ceramic quality. Although realizing crack-free ceramics combined with a smooth surface is still a major challenge, through optimizing the parameters, it is possible for LPBF processed ceramic parts to achieve properties close to those of conventionally produced ceramics.

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Section: Exemplar Ii: Silica (Sio 2 )mentioning

confidence: 75%

Section: Laser Power (P) Scanning Speed (V) Hatch Distance (H) Andmentioning

confidence: 99%

Section: Exemplar Ii: Silica (Sio 2 )mentioning

confidence: 99%

Section: Exemplar Ii: Silica (Sio 2 )mentioning

confidence: 99%

See 2 more Smart Citations

Processing Parameters for Selective Laser Sintering or Melting of Oxide Ceramics

Zhang¹,

LeBlanc²

2018

Additive Manufacturing of High-Performance Metals and Alloys - Modeling and Optimization

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“…In their model, it was noticed that the laser beam was further focused into the powder bed by the spherical geometry of the silica powder. Energy absorbed was not uniform with the maximum absorption areas occurring near to the third layer of the powder stacking[96],Streek et al…”

mentioning

confidence: 99%

Selective laser melting of ceramic-based materials for dental applications

Mapar¹

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The employment ofthe Selective Laser Melting (SLM) technique in the processing o f ceramics has attracted attention recently. SLM is a powder-based AM process where powder spreading is one o f the fundamental. Therefore, a spray-drying process was chosen to improve powder properties to reach a proper powder for the SLM process. Also a dynamic powder characterisation methodology was used to investigate powder flow characteristic. A series o f SLM experiments were conducted using the spray-dried powder in three stages: single-track melting, single-layer melting and fabrication o f threedimensional (3D) blocks (multilayers). The objectives o f this set o f experiments were to establish the preliminary processing windows o f ceramics via SLM. Finally, multilayer or ceramic 3D blocks were experimented via SLM machine. However, the density o f the fabricated 3D parts was low and the parts were also fragile and unstable. These results showed that with current state o f technology, it is still a challenge to directly fabricate dense ceramic components using SLM. Following the insights obtained from these experiments, the critical challenges o f this project were identified and discussed, including ceramic powder layer deposition, laser-powder particles interaction, the dynamic melting and consolidation mechanism, process parameter optimisation and residual stress analysis ofthe ceramic materials processed with SLM.

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Mechanical characterization of additively manufactured polymer composites: A state‐of‐the‐art review and future scope

Darji,

Singh,

Mali

2023

Polymer Composites

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The additive manufacturing (AM) technology can manufacture complex parts with considerable improvements in lead times and lower material wastages. It has enabled technological advances across many domains, from space to medical devices. The polymer composites fabricated through AM have tremendous advantages over conventional polymers in terms of mechanical performance and are, therefore, better suited for producing functional parts and assemblies. However, AM of polymer composites still presents several technological obstacles that prevent their full commercial utilization. These challenges include limited combinations of matrix and reinforcements, a requirement for hardware modification of existing machines, and challenges in mechanical characterization. This article attempts to comprehensively review the fundamentals and features of contemporary additively manufactured polymer composites (AMPCs) and examines current cutting‐edge research and development. This review highlights the gaps in the mechanical characterization of polymer composites fabricated through various technologies like material extrusion, vat‐photopolymerization, binder jetting, material jetting, powder bed fusion, and sheet lamination. There is a need to fill the identified research gaps to make AMPCs more appealing for widespread industrial use for advanced applications.

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Processing and characterizations of 2%PF/silica sand core–shell composite powders by selective laser sintering with a higher transmittance fiber laser

Cited by 17 publications

References 23 publications

Processing Parameters for Selective Laser Sintering or Melting of Oxide Ceramics

Processing Parameters for Selective Laser Sintering or Melting of Oxide Ceramics

Selective laser melting of ceramic-based materials for dental applications

Mechanical characterization of additively manufactured polymer composites: A state‐of‐the‐art review and future scope

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