FINE TUNGSTEN FROM W/MGO MECHANOCOMPOSITE OBTAINED BY THE REDUCTION OF TUNGSTEN (VI) OXIDE BY MAGNESIUM
T. A. UDALOVA1,2, S. V. VOSMERIKOV1, T. F. GRIGOREVA1, E. T. DEVYATKINA1, N. Z. LYAKHOV1
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: механохимическое восстановление, высокодисперсный вольфрам, высокоэнергетические системы, mechanochemical reduction, fine tungsten, high-energy systems
Pages: 304-309
Abstract
The effect of stoichiometric compositions and the conditions of mechanical activation on the formation of the product of WO3 reduction by magnesium was studied by means of X-ray phase analysis. In the process of mechanical activation of a mixture of tungsten (VI) oxide with magnesium at the corresponding stages, mechanochemical composites of various compositions are formed, including magnesium, tungsten (VI and IV) oxides, magnesium tungstate, tungsten and magnesium oxide. The reduction of tungsten (VI) oxide with magnesium is completed by 8 minutes of activation with the formation of a W / MgO composite. The conditions for the acid separation of tungsten from magnesium oxide from mechanochemical composites W / MgO were determined. It was shown with the help of scanning electron microscopy that tungsten separated from magnesium oxide is highly dispersed and consists of primary particles that are close to spherical in shape, with sizes from 50 to 100 nm, aggregated into secondary particles 1 to 10 microns in size. Magnesium content in finely dispersed tungsten powder, determined by means of energy dispersive analysis, is less than 2%.
DOI: 10.15372/CSD2019143
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