Method for the additive manufacture of a copper object

Abstract

A method for additive manufacturing of a copper object comprises manufacturing the object by selective fusion of powder layers superposed on a support, the selective fusion of a powder layer being obtained by the movement or sweeping of a laser beam over the powder layer, wherein the powder layer is metallic and comprises at least 95% by mass of copper. Each fusion zone of each powder layer is swept at least twice by the laser beam, the first sweep of the laser beam allowing creation of a film of nanoparticles in the surface of the powder present in each fusion zone, wherein this nanoparticle film reduces the reflectivity of the powder in each fusion zone, and the second sweep of the laser beam fusing the powder in each fusion zone due to the presence of the nanoparticle film created by the first sweep.

Dependencies are inferred from the claim text.