Effect of Heating Rate of the Original ASD-4 Powder and the ASD-4 Powder Modified by the V2O5 Oxide on the Phase Composition of Oxidation Products
V. G. Shevchenko1, D. A. Eselevich1, Z. S. Vinokurov2,3, A. V. Konyukova1
1Institute of Solid State Chemistry, Urals Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia
2Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
3Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: алюминий, порошок, модификация, пентаоксид ванадия, окисление, скорость нагрева, фазовый анализ, aluminum, powder, modification, vanadium pentoxide, oxidation, heating rate, phase analysis
Abstract
X-ray diffraction with the help of synchrotron radiation is used to analyze a sequence of phase formation in the oxidation of original and modified Al powders in the case of heating in oxidizing gaseous media with rates of 10 and 100 K/min. It is established that an increase in the heating rate of the modified ASD-4 powder leads to an active growth of metastable phase ( - and '-Al2O3) of aluminum oxide except for the -Al2O3 phase. There are assumptions on the forms of existence of vanadium in the interaction products. It is shown that diffusion limitations in the core - shell system (Al-Al2O3) can be removed under the action of an oxidizing aluminum particle on physicochemical processes at interphase boundaries.
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