Conclusions
The oxidation of ASD-4 and AV-000 aluminum powders in the temperature range 293–1773°K has been studied by the thermogravimetry (under conditions of programmed heating), thermal argon desorption, and x-ray phase analysis methods. The stresses generated during heating in the outer oxide films on aluminum particles lead to the formation of cracks in the former, which promotes oxidation of the aluminum. Marked increases have been observed in the oxidation rate and specific surface of the ASD-4 powder at temperatures corresponding to the temperature range of the γ → α-Al2O3 transition. The finding appears to be linked with an increase in the intensity of crack formation during the polymorphic transformation and with enhanced diffusional mobility in the oxide layers.
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Translated from Poroshkovaya Metallurgiya, No. 2(302), pp. 1–5, February, 1988.
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Shevchenko, V.G., Bulatov, M.A., Kononenko, V.I. et al. Effect of the properties of the surface oxide layers on the oxidation of aluminum powders. Powder Metall Met Ceram 27, 89–92 (1988). https://doi.org/10.1007/BF00802727
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DOI: https://doi.org/10.1007/BF00802727