Inert ground Vitreloy 106A powder was used as the starting material for inductively coupled plasma spheroidization. The processed powders were characterized to determine their morphology, flowability, chemistry, and thermal transitions. Processed powder samples were shown to have a particle size distribution that was consistent with the starting material indicating that no significant agglomeration of particles occurred. The average circularity of the processed powder increased when compared to the starting powder. This resulted in higher apparent and tap densities and the flowability also increased. Fine particles that were high in oxygen and copper were vaporized resulting in tightening of the chemistry distribution. XRD and DSC indicated that the starting powder was fully crystallized while the processed powder had both amorphous and crystalline structures present. Raman spectroscopy was used to detect NiO on the surface of the processed powder particles. Powder characterization indicated that the processed powder had better properties compared to the starting powder when considering flowability, amorphous content, and sphericity.
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This work was funded by Honeywell Federal Manufacturing & Technologies under Contract No. DE-NA0002839 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the United States Government purposes. The authors would also like to thank Materion for their generous donation of Vitreloy 106A powder, Lyon Davis and Wally Birtch at Tekna for their input, and Austin Sutton, Kyle Stagner, Eric Bohannan, and Jeff Hill at MS&T for their aid in this research.
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Manuscript submitted February 18, 2019.
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Kriewall, C.S., Newkirk, J.W. Plasma Spheroidization of Vitreloy 106A Bulk Metallic Glass Powder. Metall and Mat Trans A 50, 4791–4797 (2019) doi:10.1007/s11661-019-05405-8