Abstract
Additive Manufacturing (AM) allows to manufacture new designs and novel geometries interesting for jewelry and watchmaking items. However, pure gold and gold alloys are challenging materials to manufacture by Laser Powder Bed Fusion (LPBF). Due to the low absorptivity at 1 064 nm Infrared (IR) wavelength combined to high thermal conductivity, it is difficult to manufacture pure gold and gold-based alloys by this process. Recent evolutions in laser technology allowed to build a machine using a 515 nm “green” laser. By changing the wavelength (1 064 nm to 515 nm), absorptivity can be improved from 7 to 37%. This paper will focus on 18 karat gold single tracks analysis produced by both wavelengths on a steel substrate. Different melting states will be detailed and indexed in order to select, correctly, machine parameters for producing gold items. It will be shown that 515 nm laser is more adapted to the material than 1 064 nm laser for manufacturing gold alloys.
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Acknowledgements
Authors thank the EUR-EIPHI Graduate School (Grant No. 17-EURE-0002) for supporting this research project, Damien GIRAUD and Gauthier DEPIERRE for their support and help during analysis.
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This works is funded by ICB-PMDM laboratory as a PhD thesis.
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data acquisition, first draw writing, corresponding author : Aymeric DOMINE Reviews and supervision / Lucas DEMBINSKI, Ludovic VITU, Nouredine FENINECHE
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Domine, A., Dembinski, L., Vitu, L. et al. 18 Karat yellow gold single-tracks manufactured by Laser Powder Bed Fusion (LPBF): 1 064 nm and 515 nm laser comparison. Gold Bull 56, 53–58 (2023). https://doi.org/10.1007/s13404-023-00337-z
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DOI: https://doi.org/10.1007/s13404-023-00337-z