Influence of the Amount of a Fe2O3 Modifier on the Oxidation Rate of ASD-4 Micron-Sized Powder
V. G. Shevchenko1, V. N. Krasil'nikov1, D. A. Eselevich1, A. V. Konyukova1, Z. S. Vinokurov2,3, A. I. Ancharov3,4, B. P. Tolochko4,5
1Institute of Solid State Chemistry, Ural Branch of Russian Academy of Sciences, Ekaterinburg, 620990 Russia
2Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
3Novosibirsk State University, Novosibirsk, 630090 Russia
4Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
5Institute of Solid State Chemistry and Mechanochemistry Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630128 Russia
Keywords: алюминий, порошок, модификация, основной формиат железа, оксиды железа, окисление, фазовый анализ, aluminum, powder, modification, basic iron formate, iron oxides, oxidation, phase analysis
Abstract
The effect of the modification of ASD-4 micron-sized aluminum powder with iron oxide on its oxidation in air is investigated. The modification consisted of coating the surface of metal particles with gel based on Fe(OH)(HCOO)2 and ethylene glycol monomethyl ether, CH3OC2H4OH, followed by heat treatment in air. It was found that the presence of iron oxide generally has a positive effect on the dynamics of oxidation ASD-4 powder when heated in air. The oxidation rate of modified powders increases with increasing content of iron oxide in them. X-ray diffraction analysis using a synchrotron radiation source under heating to 1 000 oC showed that the samples contained only the main phases γ-Al2O3 and α-Al2O3, γ-Fe2O3 and α-Fe2O3, and other iron oxides or intermetallic compounds were not found. At a mass concentration of 10 % Fe, an earlier appearance of the phase α-Al2O3 is observed and the exothermic peak of maximum heat release is shifted to lower temperatures (893 oC) compared to the unmodified ASD-4 powder (1 045 oC).
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