Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles

Journal article
(Original article)

Publication Details

Author(s): Karg M, Rasch M, Schmidt K, Spitzer S, Karsten T, Schlaug D, Biaciu CR, Gorunov A, Schmidt M
Journal: Nanomaterials
Publication year: 2018
Volume: 8
Journal issue: 10
Pages range: 1-29
ISSN: 2079-4991
Language: English


Up to now, minimizing segregation of free-flowing, microscale metal powder mixtures
driven by different mass density is an open challenge. In this work, effects of particle size variation
on homogeneity of Al-Cu mixtures, with a density ratio of 3.3, are examined. Dry coating Al
particles with 0.3 wt% fumed silica SiOx nanoparticles significantly decreases interparticle
attraction. This enlarges the range of free-flowing Al particle sizes to < 20 µm. Powder mixture
homogeneity is examined optically in vibrated bulk powder and thinly spread layers. From various
powder mixtures, solid samples are built layer by layer with the Additive Manufacturing (3D
printing) technology Laser Beam Melting in metal powder bed (LBM). Chemical homogeneity of
solids is evaluated via energy-dispersive X-ray spectroscopy, backscattered electron microscopy,
metallographic analysis and tensile tests. Persistent homogeneity of Al-Cu powder mixtures and
LBM solids is found only with particles < 20 µm dry coated with SiOx nanoparticles. Observed
segregation phenomena are explained with a decrease in particle mobility at increasing local
concentration and the decreasing effectiveness of mass in smaller particles. The main effects are
based on geometry, so they are expected to be transferrable to other nanoparticles, alloying
components and powder bed technologies, e.g., binder jetting.

FAU Authors / FAU Editors

Karg, Michael
Lehrstuhl für Photonische Technologien
Rasch, Michael
Sonderforschungsbereich 814/3 Additive Fertigung
Schmidt, Michael Prof. Dr.-Ing.
Lehrstuhl für Photonische Technologien

Additional Organisation
Sonderforschungsbereich 814/3 Additive Fertigung
Zentralinstitut für Neue Materialien und Prozesstechnik
Erlangen Graduate School in Advanced Optical Technologies

Research Fields

Additive Manufacturing
Lehrstuhl für Photonische Technologien
Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät
Optische Technologien
Research focus area of a faculty: Technische Fakultät

How to cite

Karg, M., Rasch, M., Schmidt, K., Spitzer, S., Karsten, T., Schlaug, D.,... Schmidt, M. (2018). Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles. Nanomaterials, 8(10), 1-29.

Karg, Michael, et al. "Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles." Nanomaterials 8.10 (2018): 1-29.


Last updated on 2019-01-04 at 09:34