Kinetics of Fe2O3-Al reaction prior to mechanochemical synthesis of Fe3Al-Al2O3 nanocomposite powder using thermal analysis

Document Type : Original Research Paper

Author

Faculty of Materials Science and Engineering, K.N. Toosi University of Technology, Tehran, Iran

10.22034/jna.2019.668031

Abstract

The effect of ball milling on kinetics of the thermite reaction of 3Fe2O3 + 8Al powder mixture to synthesize
Fe3Al-Al2O3 nanocomposite was investigated using differential thermal analysis. A model-free method
was applied to the non-isothermal differential calorimetry (DSC) data to evaluate the reaction kinetics
according to the Starink method. The activation energy of the thermite reaction in the Fe2O3-Al system
in ball milled 3Fe2O3 + 8Al powder mixture was determined to be 97 kJ/mole, which is smaller than
that for non-milled powder mixture indicating the change of reaction mechanisms. The change in the
reaction mechanism could be resulted from the formation of short-circuit diffusion paths occurring in
the precursors during milling. The change in the reaction mechanism of such nanostructured 3Fe2O3 +
8Al powder mixture could be reason of the formation of desired phases (Fe3Al and Al2O3), which such
stoichiometric phases cannot be achieved by conventional molten state thermite reaction.

Keywords

Journal of Nanoanalysis
Volume 6, Issue 3
September 2019
Pages 199-204

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