Laser-matter interaction model of laser beam melting applied to oxide ceramics and comparison with metallic alloy

Moniz, Liliana; Colin, Christophe; Berger, Marie‐Hélène; Bartout, Jean-Dominique

doi:10.2351/1.5138151

Cited by 1 publication

(1 citation statement)

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“…However, no material development was presented and therefore the laser absorptance for near infrared laser was extremely unstable. Finally, in Moniz et al [9] and Moniz et al [19], the absorptance of alumina powder with additions of carbon and silicon carbide was analytically calculated, based on the melt-pool dimensions. This method was practical, but it neglected the complex thermodynamical phenomena that occur during laser powder bed fusion (L-PBF).…”

Section: Introductionmentioning

confidence: 99%

Process characterization and analysis of ceramic powder bed fusion

Florio

Puccio

Viganò

et al. 2021

Int J Adv Manuf Technol

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Powder bed fusion (PBF) of ceramics is often limited because of the low absorptance of ceramic powders and lack of process understanding. These challenges have been addressed through a co-development of customized ceramic powders and laser process capabilities. The starting powder is made of a mix of pure alumina powder and alumina granules, to which a metal oxide dopant is added to increase absorptance. The performance of different granules and process parameters depends on a large number of influencing factors. In this study, two methods for characterizing and analyzing the PBF process are presented and used to assess which dopant is the most suitable for the process. The first method allows one to analyze the absorptance of the laser during the melting of a single track using an integrating sphere. The second one relies on in-situ video imaging using a high-speed camera and an external laser illumination. The absorption behavior of the laser power during the melting of both single tracks and full layers is proven to be a non-linear and extremely dynamic process. While for a single track, the manganese oxide doped powder delivers higher and more stable absorptance. When a full layer is analyzed, iron oxide-doped powder is leading to higher absorptance and a larger melt pool. Both dopants allow the generation of a stable melt-pool, which would be impossible with granules made of pure alumina. In addition, the present study sheds light on several phenomena related to powder and melt-pool dynamics, such as the change of melt-pool shape and dimension over time and powder denudation effects.

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Section: Introductionmentioning

confidence: 99%