Impact of oxygen content in powders on the morphology of the laser molten tracks in preparation for additive manufacturing of silicon

Powder additive pulsed Nd:YAG laser (wavelength 1064 nm), with the aim of preparing AM of such material. The influence of oxygen content in the initial silicon powders on the continuous tracks morphology was investigated. It was found that the initial oxygen content of the processed powders must be lower than 0.1 wt% to produce a smooth silicon melted track. This result is explained as due to the formation of gaseous manufacturing (AM) of materials is affected by the oxygen present in the raw material, especially if they possess a native oxide. The latter influences the properties of the laser molten track. We carried out a study on the interactions between silicon fine powder (<3 mu m) pellets and a silicon monoxide (SiO) by reaction between silicon and its native oxide during the process. (C) 2019 Elsevier B.V. All rights reserved.