This paper describes the development of suitable process parameters to ensure a reproducible, defect-free production ofpure copper specimen via Laser Powder Bed Fusion (LPBF) also called Selective Laser Melting (SLM). Therefore, a setof experiments was developed and evaluated in a Design of Experiment (DoE) which finally provide an indication aboutideal process parameters for melting pure copper powder at a wavelength of 1070 nm. For the experiments Cu-ETP witha copper purity of more than 99.90 % was processed with a laser power of up to 500 W resulting in a maximum density of99.82 % and an electrical conductivity of 56.88 MS/m. Besides the development of optimal parameter combinations oflaser power, laser speed and hatching distance, focusing the laser beam to a spot diameter of about 35 μm with a fusedsilica f-theta lens and thus high laser intensities of about 416 kW/mm² resulted in best materials properties.
展开▼
