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Materials 2018, 11(9), 1641; https://doi.org/10.3390/ma11091641

Spheroidization of Nickel Powder and Coating with Carbon Layer through Laser Heating

1
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
2
Research Institute of Science & Technology, Tokai University, Kanagawa 259-1292, Japan
*
Author to whom correspondence should be addressed.
Received: 21 August 2018 / Revised: 4 September 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Special Issue Laser Ablation in the Synthesis of Novel Nanostructured Materials)
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Abstract

We developed a simple and efficient process, laser heating of nickel powder in ethanol, to produce carbon-encapsulated nickel microspheres. Long-pulse-width laser heated nickel powder suspended in pure ethanol into liquid droplets. In turn, the latter droplets became sphere-like, pyrolyzed surrounding ethanol and dissolved the produced carbon atoms. Because of their lower solubility in solid nickel, excess carbon atoms were then expelled from the metal core after solidification, thus forming graphite-like shells on the laser-modified Ni spheres. Hence, after pyrolysis the transformation of carbon was found to follow the dissolution-precipitation mechanism. The produced carbon-encapsulated nickel microspheres exhibited higher oxidation resistance compared with the initial nickel powder, while keeping their magnetic properties essentially unchanged. View Full-Text
Keywords: nickel powder; carbon-encapsulated; long-pulse-width laser; oxidation resistance nickel powder; carbon-encapsulated; long-pulse-width laser; oxidation resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, S.; Shao, Y.-L.; Cui, L.; Kulinich, S.A.; Du, X.-W. Spheroidization of Nickel Powder and Coating with Carbon Layer through Laser Heating. Materials 2018, 11, 1641.

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