Microwave Activated Combustion Synthesis and Compaction in Separate E and H Fields: Numerical Simulation and Experimental Results

ISSN 1121-7588

Roberto Rosa¹, Paolo Veronesi¹, Cristina Leonelli¹, Anna Bonamartini Corradi¹, Monica Ferraris², Valentina Casalegno², Milena Salvo², Han Shaohua²
¹University of Modena and Reggio Emilia, Department of Materials and Environmental Engineering, via Vignolese 905, 41125 Modena, Italy
²Politechnic of Turin, Materials Science and Chemical Engineering Department, Corso Duca degli Abruzzi 24, 10129, Turin, Italy

Abstract

Microwaves (MW) at the ISM frequency of 2.45 GHz have been used to ignite the Combustion Synthesis (CS) of pressed ceramic and metallic powders mixtures, using a single-mode applicator (TE₁₀₃₎. This experimental apparatus allows to study the separate effect of prevalent electric or magnetic field on the selective heating of the reactive powders compacts, while transferring energy and not heat before and after CS. Microwave activated combustion syntheses (MACS) of TiC-40 wt%Fe and FeAl intermetallic compounds were performed in the two different field configurations (maximum of the electric field (E) and maximum of magnetic field (H)) in order to investigate any possible difference in the reaction mechanism and in the final microstructure of the products.
MACS in the maximum of E has also been applied to high temperature materials joining, with the application of a moderate pressure during the irradiation with electromagnetic waves, to promote adhesion and to reduce the newly formed compounds porosity.

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