High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

P. Haušilda, M. Karlíka, T. Skibab, P. Sajdlc, J. Dubskýd and M. Palme aCzech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Prague 2, Czech Republic bResearch Centre Rez Ltd., Husinec-Rez 130, 250 68 Rez, Czech Republic cInstitute of Chemical Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic dInstitute of Plasma Physics AS CR, v. v. i., Department of Materials Engineering, Za Slovankou 3, 182 00 Prague 8, Czech Republic eMax-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, D-40237 Düsseldorf, Germany

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The presented work deals with the oxidation resistance of spark plasma sintered and thermally sprayed FeAl-based intermetallics. Gas-atomized binary single phase Fe-43(at.%)Al and dual phase Fe-55(at.%)Al powders were used for spark plasma sintering and/or thermal spraying. Coatings were deposited by two different plasma spray technologies - gas and water stabilized plasma guns. The prepared samples were exposed to oxidation in artificial air at 700°C. The mass gain was measured during oxidation at 700°C up to 1000 h. Microstructures, phase and chemical compositions of the formed scales were characterized after the exposition by means of scanning electron microscopy, X-ray diffraction and electron spectroscopy for chemical analysis (X-ray photoelectron spectroscopy).

DOI: 10.12693/APhysPolA.122.465 PACS numbers: 81.05.Bx, 81.65.Mq, 81.20.Ev, 81.15.Rs