Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/3786
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.
URI: http://hdl.handle.net/10316/3786
Rights: openAccess
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
filec5d47aee56004f78bda04ac1045d3b65.pdf1.01 MBAdobe PDFView/Open
Show full item record

Page view(s) 50

389
checked on Oct 16, 2019

Download(s) 20

576
checked on Oct 16, 2019

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.