Bubble formation in additive manufacturing of glass

Luo, Jizhuang; Gilbert, Luke J.; Peters, Daniel; Bristow, Douglas A.; Landers, Robert G.; Goldstein, Jonathan T.; Urbas, Augustine; Kinzel, Edward C.

doi:10.1117/12.2224321

Cited by 3 publications

(1 citation statement)

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“…At fast v (or the lower input LED ), this reduces vaporisation of low temperature volatiles within the powder mixtures ( a.k.a. the reboil effect [59] ) and minimises possible reaction between the additive and SiO 2 .…”

Section: In Situ Observations During Laser Powder Bed Fusionmentioning

confidence: 99%

Enhanced near-infrared absorption for laser powder bed fusion using reduced graphene oxide

Leung

Elizarova

Isaacs

et al. 2021

Applied Materials Today

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Laser powder bed fusion (LPBF) is a revolutionary manufacturing technology that fabricates parts with unparalleled complexity, layer-by-layer. However, there are limited choices of commercial powders for LPBF, constrained partly by the laser absorbance, an area that is not well investigated. Carbon additives are commonly used to promote near infra-red (NIR) absorbance of the powders but their efficiency is limited. Here, we combine operando synchrotron X-ray imaging with chemical characterisation techniques to elucidate the role of additives on NIR absorption, melt track and defect evolution mechanisms during LPBF. We employ a reduced graphene oxide (rGO) additive to enable LPBF of low NIR absorbance powder, SiO 2 , under systematic build conditions. This work successfully manufactured glass tracks with a high relative density (99.6%) and overhang features ( > 5 mm long) without pre/post heat treatment. Compared to conventional carbon additives, the rGO increases the powder's NIR absorbance by ca. 3 times and decreases the warpage and porosity in LPBF glass tracks. Our approach will dramatically widen the palette of materials for laser processing and enable existing LPBF machines to process low absorbance powder, such as SiO 2 , using a NIR beam.

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Section: In Situ Observations During Laser Powder Bed Fusionmentioning

confidence: 99%