Phase Transformation by the Oxidation of Air-passivated W and Mo Nanopowders Produced by an Electrical Explosion of Wires

Young-Soon Kwon; Ji-Soon Kim; Alexander A. Gromov; Moon-Hee Hong

doi:10.4150/KPMI.2004.11.2.130


Phase Transformation by the Oxidation of Air-passivated W and Mo Nanopowders Produced by an Electrical Explosion of Wires: Young-Soon Kwon, Ji-Soon Kim, Alexander A. Gromov, Moon-Hee Hong; Journal of Korean Powder Metallurgy Institute 2004;11(2):130-136
DOI: https://doi.org/10.4150/KPMI.2004.11.2.130

¹Research Centre for Machine Parts and Materials Processing, School of Materials and Metallurgical Engineering, University of Ulsan
²Research Centre for Machine Parts and Materials Processing, School of Materials and Metallurgical Engineering, University of Ulsa
³Chemical Technology Department, Tomsk Polytechnic University
⁴Materials Science Division, Agency for Defence Development

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Abstract

The passivation and oxidation process of tungsten and molybdenum narlopowders, produced by electrical explosion of wires was studied by means of FE-SEM, XPS. XRD, TEM, DIA-TGA and sire distribution analysis. In addition, the phase transformation of W and Mo nanopowders under oxidation in air was investigated. A chemical process is suggested for the oxidation of W and Mo nano-particles after a comprehensive testing of passivated and oxidized powders.

Keywords: tungsten and molybdenum nanopowders;passivation;oxidation and coatings;

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