Effect of Barium on the Oxidation Kinetics of an Aluminum-Based Alloy Powder
V. G. Shevchenko1, D. A. Eselevich1, A. I. Ancharov2,3, B. P. Tolochko2
1Institute of Solid State Chemistry, Russian Academy of Sciences, Ekaterinburg, 620990 Russia
2Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, 630128 Russia
3Novosibirsk State University, Novosibirsk, 630090 Russia
Keywords: aluminum powder, surface segregation, alloying, in situ study of phase transformations, oxidation activity
Abstract
The effect of the phase composition of an aluminum-based alloy powder containing 1.3% barium and the products of its interaction with air on the kinetics and mechanism of oxidation was first studied by x-ray diffraction using synchrotron radiation. It is found that the high surface and reactivity of barium lead to the activation of aluminum oxidation due to the heterogeneity of the phase composition of the barrier layer of the reaction products on the particle surface.
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