Melt pool signatures of TiN nanoparticle dry-coated Co25Cr25Fe25Ni25 metal powder in laser-powder-bed-fusion

• DOI: 10.1016/j.matdes.2023.111626
• Publication Date: 2023-01-13T10:36:37Z
• Authors: Eric Gärtner; Arne Witte; Nicolas J. Peter; Vivek Devulapalli; Nils Ellendt; Gerhard Dehm; Eric A. Jägle; Volker Uhlenwinkel; Lutz Mädler
• Keywords: Powder coating; Angle of repose; Metal powder; Particle (ecology)

Metal powders in laser-powder-bed-fusion (L-PBF) often exhibit cohesive flow resulting from interparticle adhesion. Nanoparticle dry-coating can improve powder flowability and promote layer densification. A Co25Cr25Fe25Ni25 metal (20–90 µm) is dry-coated with TiN particles a diameter of 16 nm at low concentrations up to 69 ppm. The dynamic angle repose decreased bulk density increased compared the uncoated state 49 ° 4.67 g/cm3 29 4.81 TiN, respectively. UV/Vis spectroscopy showed negligible alterations by additions on light absorption. modifications strongly affected their corresponding processability L-PBF reduced melt pool signatures situ detected confocal single-color pyrometer signal as well ex measured depth width. With increasing flowability, significant decrease thermal emission size was observed. results demonstrate impact quality parts when particle interactions are actively modified.