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.

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