Influence of Carbon Nanoparticle Addition (and Impurities) on Selective Laser Melting of Pure Copper

Materials

Jan Van Humbeeck¹  Jozef Vleugels¹  Peter Van Puyvelde²  SurajDinkar Jadhav³  Johan Hofkens³  Shoufeng Yang⁴  Jean-Pierre Kruth⁵  Kim Vanmeensel⁵  Sasan Dadbakhsh⁵ 

[1] Member of Flanders Make, Celestijnenlaan 300, B-3001 Heverlee, Belgium;Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200 F, B-3001 Heverlee, Belgium;Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, B-3001 Heverlee, Belgium;Department of Molecular Visualization and Photonics KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium;;PMA, Department of Mechanical Engineering, KU Leuven &

关键词: selective laser melting;    copper;    carbon-mixed-copper;    laser reflection;    laser absorption;   

DOI  :  10.3390/ma12152469

来源: DOAJ

【 摘 要 】

The addition of 0.1 wt % carbon nanoparticles significantly improved the optical absorption and flowability of gas-atomized copper powder. This facilitated selective laser melting (SLM) by reducing the required laser energy density to obtain 98% dense parts. Moreover, the carbon addition led to an in situ de-oxidation of the copper parts during the SLM process. The properties of the as-built copper parts were limited to a tensile strength of 125 MPa, a ductility of 3%, and an electrical conductivity of 22.7 × 10⁶ S/m, despite the advantageous effect of carbon on the powder characteristics and SLM behavior. The modest mechanical properties were associated with the segregation of carbon nanoparticles and other impurities, such as phosphorus and oxygen along grain boundaries of epitaxially grown grains. Whereas, the low electrical conductivity was mainly attributed to the phosphorus impurity in solid-solution with copper.

【 授权许可】

Unknown