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

Karg M, Rasch M, Schmidt K, Spitzer S, Karsten TF, Schlaug D, Biaciu CR, Gorunov A, Schmidt M (2018)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Book Volume: 8

Pages Range: 1-29

Article Number: 862

Journal Issue: 10

URI: https://www.mdpi.com/2079-4991/8/10/862

DOI: 10.3390/nano8100862

Open Access Link: https://www.mdpi.com/2079-4991/8/10/862

Abstract

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.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

Kazan National Research Technical University named after A.N. Tupolev Russian Federation (RU)

How to cite

APA:

Karg, M., Rasch, M., Schmidt, K., Spitzer, S., Karsten, T.F., Schlaug, D.,... Schmidt, M. (2018). Laser Alloying Advantages by Dry Coating Metallic Powder Mixtures with SiOx Nanoparticles. Nanomaterials, 8(10), 1-29. https://doi.org/10.3390/nano8100862

MLA:

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

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