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Title: Fe2O3/aluminum thermite reaction intermediate and final products characterization
Authors: Durães, Luísa 
Costa, Benilde F. O. 
Santos, Regina 
Correia, António 
Campos, José 
Portugal, António 
Keywords: Thermite; Iron oxide/aluminum reaction; Products characterization; X-ray diffraction; Mössbauer spectroscopy; Reaction mechanism
Issue Date: 2007
Citation: Materials Science and Engineering: A. 465:1-2 (2007) 199-210
Abstract: Radial combustion experiments on Fe2O3/aluminum thermite thin circular samples were conducted. A stoichiometric (Fe2O3 + 2Al) and four over aluminized mixtures were tested. The combustion products were characterized by X-ray diffraction and Mössbauer spectroscopy and the influence of Fe2O3/aluminum ratio on their composition was assessed. The main products were identified as alumina ([alpha]-Al2O3) and iron (Fe). A significant amount of hercynite (FeAl2O4) was detected, decreasing with the aluminum excess in the reactants. Close to the sample/confinement interface, where reaction quenching occurs, a non-stoichiometric alumina (Al2.667O4) was observed, being its XRD intensity correlated to the hercynite amount. Fe3Al intermetallic phase was found in the products of over aluminized mixtures. A reaction mechanism was proposed comprising: (i) Fe2O3 reduction to Fe3O4 and FeO; (ii) Al oxidation to Al2O3; (iii) interaction of the remaining Al with Fe3O4 and FeO with formation of iron-aluminates (hercynite) and iron; (iv) for the over aluminized mixtures, incorporation of Al into the iron-aluminates takes place with the formation of iron and alumina and, in parallel, Al reacts with iron to produce intermetallics.
DOI: 10.1016/j.msea.2007.03.063
Rights: openAccess
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais

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