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4691 |
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Study of high velocity arc sprayed heat resistant coatings from FeCrAlBY core wire |
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Stanislav Nevezhin* / Ural Federal University, Russia Davide Fantozzi / Tampere University of Technology, Department of Materials Science, Finland Irina Malygina/ The Institute of Engineering Science, RAS (Ural Branch), Russia Yury Korobov/ Ural Federal University, Russia Andrea Milanti/ Tampere University of Technology, Department of Materials Science, Finland Heli Koivuluoto/ Tampere University of Technology, Department of Materials Science, Finland Petri Vuoristo/ Tampere University of Technology, Department of Materials Science, Finland Alexey Makarov/ The Institute of Engineering Science, RAS (Ural Branch), Russia Michael Filippov/ Ural Federal University, Russia |
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The present work was undertaken to examine influence of alloying elements in Fe-Cr-B-Al-Y core wire on heat- and wear resistance regarding to coatings produced by High Velocity Arc Spraying. Here propane-air combustion products were used as a carrier gas. The microstructure of the coatings was investigated by Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-ray (EDX) microanalysis, whereas phase composition was assessed by X-Ray Diffractometry (XRD). Heat resistance of coatings was determined after high-temperature oxidation test with duration of 100h at 700 °C. High temperature corrosion test under KCl salt deposit was performed for the duration of 168h at 550°C under air flow containing 12% specific humidity. The effects of oxidation and corrosion on the coating microstructure and the corrosion products were examined. Influence of B, Cr, Al, Y additives on formation of complex carbides like (Fe,Cr)2(B,C) and complex oxides like (Fe,Al,Y)2O3 was analyzed. Pin-on-plate wear test, evaluation of hardness, adhesive strength and porosity were performed. The coating presented elevated abrasive wear-, high temperature corrosion- and heat resistance when compared to alternative coatings. |