Formation mechanism of MgO hollow nanospheres via calcination of C-MgO composite produced by electric arc spraying

Spherical MgO nanoparticles were obtained using the method of electric arc spraying of the Mg-C composite electrode, followed by calcination in air. The composition and morphology of nanostructures, formed at spraying, were studied; kinetics of changes in the elemental composition of the carbon-magn...

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Bibliographic Details
Published in:Ceramics international 2019-04, Vol.45 (6), p.7338-7343
Main Authors: Smovzh, Dmitry V., Sakhapov, Salavat Z., Zaikovskii, Alexey V., Chernova, Svetlana A., Novopashin, Sergey A.
Format: Article
Language:English
Subjects:
Arc discharge
Calcination
Condensation
MgO
Nanoceramics
Nucleation
Powders
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Summary:Spherical MgO nanoparticles were obtained using the method of electric arc spraying of the Mg-C composite electrode, followed by calcination in air. The composition and morphology of nanostructures, formed at spraying, were studied; kinetics of changes in the elemental composition of the carbon-magnesium composite was investigated at annealing in the range of up to 900 °C. It is shown that during arc spraying, core-shell nanoparticles are formed with a carbon core and shell enriched with magnesium nanoparticles, which are oxidized to MgO at contact with the atmosphere. When carbon-magnesium composites are annealed, carbon burns out; the morphology of magnesium oxide nanoparticles is a 250-nm sphere of magnesium crystals of 20–30 nm in size.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2019.01.017