Using Raman spectroscopy to monitor surface finish and roughness of components manufactured by selective laser sintering

Beard, M. A.; Ghita, Oana; Evans, K.

doi:10.1002/jrs.2771

Cited by 25 publications

(15 citation statements)

References 9 publications

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“…The surface roughness of the parts without the powder decreases for increasing laser powers up to 5.5 W, remaining constant at 6.5 W. This result is expected, as the increase in laser power is followed by a higher degree of sintering with a consequent smoothing of the surface topography. Beard et al (2011a) reported very similar results on laser-sintered polyamide samples measured with the optical profilometry technique. For the parts that incorporated a powder coating, both the roughness values and the spread in the measurements were significantly bigger.…”

Section: Surface Characterizationsupporting

confidence: 78%

Correlation between mechanical and surface properties of SLS parts

Setti

Oliveira

Maia

et al. 2014

Rapid Prototyping Journal

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Purpose -The purpose of this paper is to compare the results from mechanical testing with measurements of surface-dependent properties performed on polyamide parts made by selective laser sintering (SLS) to assess a possible correlation between them. Design/methodology/approach -Fabrication of Nylon 12 (Duraform PA ® ) samples using different laser power levels and their characterization by tensile testing, roughness and Raman scattering measurements. Findings -Among the surface methods investigated, the results from Raman spectroscopy are the best ones, but methods dependent on surface analysis are not really suitable as indicators of the mechanical properties. The correlation coefficients for linear fitting obtained when the normalized results of mechanical properties are plotted against the surface properties are too low. Furthermore, the ambiguity between surface and mechanical data makes it impossible to use these surface properties for prediction purposes in the industrial environment. Originality/value -Quantitative evaluation and correlation between mechanical properties and surface properties of SLS-made samples.

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Section: Surface Characterizationsupporting

confidence: 78%

Correlation between mechanical and surface properties of SLS parts

Setti

Oliveira

Maia

et al. 2014

Rapid Prototyping Journal

View full text Add to dashboard Cite

show abstract

“…The surface roughness is not only influenced by the orientation of the structure [32], but also by the processing parameters [33] and the batch material. Considering the various machines, with significant differences in their construction, it was expected to find divergence between the produced samples.…”

Section: Surface Roughnessmentioning

confidence: 99%

Capabilities and Limitations of Using Desktop 3-D Printers in the Laser Sintering Process

2020

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Almost one-third of the revenues of the Additive Manufacturing (AM) machines market is generated by desktop systems. A new category of such devices are Laser Sintering (LS) machines, in which we can find a few representatives of this group. A growing interest in the use of desktop AM solutions in research and industry is visible, and therefore an evaluation of its capabilities and limitations is desirable. The presented paper focuses on comparing desktop (Sintratec S1; Sinterit Lisa) and industrial (Formiga P110) LS systems. The properties of raw materials were characterized by Scanning Electron Microscopy (SEM) and Differential Scanning Calorimetry (DSC), as well as by determining the Particle Size Distribution (PSD) and static and dynamic flowability of powder. Laser Sintering commercial sets were characterized by their mechanical properties (tensile strength), surface quality (roughness), as well as by their accuracy and porosity (computed tomography). The conducted test showed significant differences, especially in the case of material properties and manufacturing repeatability. The found differences between desktop and industrial LS systems suggest that the use of a low-budget LS system, especially for the research and production of end-use parts, has to take into account its limitations.

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“…The spectrum of the water-treated sample of Figure 5b exhibits broadly similar results to those of Figure 5c, as well as showing an apparent increase in the relative intensity of the LO phonon band compared to Figure 5a. It is evident from the spectrum that there is a significant background signal in this spectrum, most likely attributable to surface roughness and reflectivity (11). However, as with previous samples, the absence of a readily discernible shoulder intensity at 470 cm -1 suggests that the structure is still predominantly cubic with no observable tetragonal character (4), although it is far from a perfect fluorite structure.…”

Section: Resultsmentioning

confidence: 53%

Corrosion Behavior of AGR Simulated Fuels – Evolution of the Fuel Surface

et al. 2013

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We have prepared a range of Advanced Gas-cooled Reactor (AGR) SIMFUELs at a range of simulated burn-ups and, using Raman spectroscopy, have studied the effect of the SIMFUEL dopants on the UO 2 crystal structure. We have also studied the effect of exposure to hydrogen peroxide solutions on the SIMFUEL surface. The intensity of the fundamental U-O stretch (445 cm-1) decreases as the amount of dopant increases in each SIMFUEL burn-up composition. A simultaneous increase in the lattice damage (500-700 cm-1) peak is observed as the UO 2 cubic fluorite lattice structure becomes more distressed and moves towards a tetragonal structure. Exposure to 100 µmol dm-3 H 2 O 2 further decreases the fundamental U-O stretch and increases the lattice damage peak, suggesting that additional point defects are established as the concentration of interstitial oxygen is increased in the lattice via the H 2 O 2-induced corrosion of the SIMFUEL.

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Using Raman spectroscopy to monitor surface finish and roughness of components manufactured by selective laser sintering

Cited by 25 publications

References 9 publications

Correlation between mechanical and surface properties of SLS parts

Correlation between mechanical and surface properties of SLS parts

Capabilities and Limitations of Using Desktop 3-D Printers in the Laser Sintering Process

Corrosion Behavior of AGR Simulated Fuels – Evolution of the Fuel Surface

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