Fe2O3/aluminum thermite reaction intermediate and final products characterization

• Autor(es): Durães, Luísa ; Costa, Benilde F.O. ; Santos, Regina ; Correia, António ; Campos, José ; Portugal, António
• Data: 2007
• Identificador Persistente: http://hdl.handle.net/10316/3786
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Thermite; Iron oxide/aluminum reaction; Products characterization; X-ray diffraction; Mössbauer spectroscopy; Reaction mechanism
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

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. http://www.sciencedirect.com/science/article/B6TXD-4NB2WNM-D/1/330874328b00bbec08b3f511d245aa05