Olympia LLC (Novomoskovsk, Russia)
R. K. Bayramov, Deputy Director, rbairamovintech@yandex.ru
Plasmatech JSC (Novomoskovsk, Russia)
L. D. Rudnik, Chief Technologist
Tulamashzavod JSC (Tula, Russia)
M. Yu. Grigoriev, Chief Metallurgist
Lomonosov Moscow State University (Moscow, Russia)
D. N. Stolbov, Research Scientist
Novomoskovsk Joint-Stock Company Azot (Novomoskovsk, Russia)
D. A. Safronov, Deputy Head of the Workshop
The process of titanium dispersion in pulsed discharges in aqueous solutions has been investigated. It was established that the dispersion of the metal in distilled water and in a weak ammonium nitrate solution yields a mixture of titanium oxides with reduced oxygen content, the main components of which are dititanium oxide (Ti2O) and titanium monoxide (TiO). Atomic oxygen released during the thermal decomposition of the working solution in the spark discharge zone reacts with dispersed metal particles to form the corresponding compounds. It was found that the dispersion process produces ultradisperse powders of compounds whose particle shape is predominantly close to spherical, with occasional plate-like particles. The particle sizes range from 10 to 300 nm. The fraction of particles with sizes from 10 to 50 nm is about 90%, while particles larger than 50 nm account for about 10%. Upon dispersion of the metal in a weak ammonium nitrate solution, a slight increase in the TiO and Ti2O3 content in the mixture is observed, which is likely due to an increase in the amount of atomic oxygen generated during the process. It was shown that oxygen from oxygen-containing anions thermally decomposed in the discharge zone participates in the release of atomic oxygen. This confirms the assumption of anion participation in the formation of atomic oxygen. It was found that the composition of the final product is significantly influenced by the nature of the dispersed metal.
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