Quantifying the degree of particle melt in Selective Laser Sintering ®

Hopkinson, Neil; Majewski, Candice; Zarringhalam, Hadi

doi:10.1016/j.cirp.2009.03.001

Cited by 60 publications

(38 citation statements)

References 5 publications

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“…Although the DSC is commonly used to quantify the melting behavior of samples in both melt processing 1,24,25 and powder sintering, 5,7,14,26 we found that the melting temperatures obtained from the DSC did not result in fully melted powders in HSM (see Fig. 1).…”

Section: Optimization Of Processing Conditions By Hot Stage Microscopymentioning

confidence: 81%

Nanoclay/Polymer Composite Powders for Use in Laser Sintering Applications: Effects of Nanoclay Plasma Treatment

Almansoori

Majewski

Rodenburg

2017

JOM

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Plasma-etched nanoclay-reinforced Polyamide 12 (PA12) powder is prepared with its intended use in selective laser sintering (LS) applications. To replicate the LS process we present a downward heat sintering (DHS) process, carried out in a hot press, to fabricate tensile test specimens from the composite powders. The DHS parameters are optimized through hot stage microscopy, which reveal that the etched clay (EC)-based PA12 (EC/PA12) nanocomposite powder melts at a temperature 2°C higher than that of neat PA12, and 1-3°C lower than that of the nonetched clay-based nanocompsite (NEC/PA12 composite). We show that these temperature differences are critical to successful LS. The distribution of EC and NEC onto PA12 is investigated by scanning electron microscopy (SEM). SEM images show clearly that the plasma treatment prevents the micron-scale aggregation of the nanoclay, resulting in an improved elastic modulus of EC/PA12 when compared with neat PA12 and NEC/PA12. Moreover, the reduction in elongation at break for EC/PA12 is less pronounced than for NEC/PA12.

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Section: Optimization Of Processing Conditions By Hot Stage Microscopymentioning

confidence: 81%

Nanoclay/Polymer Composite Powders for Use in Laser Sintering Applications: Effects of Nanoclay Plasma Treatment

Almansoori

Majewski

Rodenburg

2017

JOM

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“…The geometrical configuration or un-melted particles arrangement have been reproduced from [50]. Circles stand for the level set modelling [46,47] the interface zone between un-melted particles and the surrounding continuum that has been melted.…”

Section: Tests 3 Andmentioning

confidence: 99%

“…The process parameters used to print this part are shown in Table 2 corresponding to the configuration depicted in Figure 6. Part bed set-point ( o C) Scan Speed (mm/s) Scan spacing (mm) Laser power (W) 149 5000 0.15 11 Table 2: Build parameters used to produce the SLS part in test 3 [50] Test four mirrors the same simulation parameters of test 3 except for the number, location and size of un-melted particles. The result of test 4 is depicted in Figure 7.…”

Section: Tests 3 Andmentioning

confidence: 99%

“…Circles stand for the level set modelling [46,47] the interface zone between un-melted particles and the surrounding continuum that has been melted. The sizes and distribution comes from experimentally obtained configurations by [50] . The general aim of the experiments are to have simulations with parameters based on the previous experiments but where the inclusions added represent the cross section of a real SLS printed part.…”

Section: Tests 3 Andmentioning

confidence: 99%

“…The result of test 4 is depicted in Figure 7. The cross section for this part was reproduced from [50], where optical microscope images of micro-toned specimens were taken from a build where the properties are shown in Table 3. In order to 13 be able to compare tests 3 and 4, the simulation settings remained the same between the two.…”

Section: Tests 3 Andmentioning

confidence: 99%

See 2 more Smart Citations

What triggers a microcrack in printed engineering parts produced by selective laser sintering on the first place?

et al. 2015

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The proximity of un-melted particles within Selective Laser Sintered (SLS) printed engineering parts made of nylon-12 is found as a major triggering effect for cracking and ultimately failure. The numerical investigation, by means of the eXtended Finite Element Method (XFEM), was performed over samples with different arrangements of un-melted particles obtained experimentally . The onset and propagation of microcracks was simulated. This included inherently how the degree of particle melt (DPM) in SLS parts affects and controls both crack initiation and propagation. The results evidenced that a microcrack started invariably between the two closest un-melted particles in all numerical tests performed considering different arrangements of un-melted particles.

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3D Printing of Diamond Tools for Dental Ceramics Processing

Yang

et al. 2017

Adv Eng Mater

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This paper is focused on preparing diamond tools with orderly arranged abrasive particles for dental ceramics processing via 3D printing. This allows one to overcome such drawbacks of the existing methods of dental ceramics processing as weak bonding strength, short service life, and irregular diamond distribution in diamond tools. Firstly, the CAD model of the dental diamond tool is constructed using 3D cartographic software, with level-scanpath geometry information generated via hierarchcal slicing. Then, using Ni-Cr alloy powder and diamond as raw materials, the dental ceramics processing diamond tool with orderly arranged diamond particles is prepared via a 3D printer. Next, an X-ray diffractometer, energy dispersive spectrometer, and scanning electron microscope are used to analyze the microstructure of the Ni-Cr alloy and diamond particle interfaces, resulting in the identification of their bonding mechanism. Finally, the diamond grinding wheel produced by 3D printing is subjected to dental zirconia ceramics grinding performance tests. The results obtained confirm that diamond particles experience normal wear, while no abrasive falling off occurs on the 3D printed diamond tool surface.

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Quantifying the degree of particle melt in Selective Laser Sintering ®

Cited by 60 publications

References 5 publications

Nanoclay/Polymer Composite Powders for Use in Laser Sintering Applications: Effects of Nanoclay Plasma Treatment

Nanoclay/Polymer Composite Powders for Use in Laser Sintering Applications: Effects of Nanoclay Plasma Treatment

What triggers a microcrack in printed engineering parts produced by selective laser sintering on the first place?

3D Printing of Diamond Tools for Dental Ceramics Processing

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