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RD2.3 High-Temperature Oxidation Behavior of Fe-25Cr-5Al Arc Spraying Coatings

Thursday, May 24, 2012: 8:40 AM
Room 339 AB (Hilton Americas Houston )
Prof. Yury Korobov , Ural Federal University, Ekaterinburg, Russia
Prof. Michael Filippov , Ural Federal University, Ekaterinburg, Russia
Mr. Stanislav Nevezhin , Ural Federal University, Ekaterinburg, Russia
Dr. Maksim Karabonalov , Ural Federal University, Ekaterinburg, Russia
High-Temperature Oxidation Behavior of Fe-25Cr-5Al Arc Spraying Coatings

 

According to our modeling of oxygen input into particles at arc spraying (AS) a cored wire of Fe-25Cr-5Al type was developed. The oxidation behavior of AS coatings from this wire was studied in air under atmospheric pressure at 1000°C. Influence of Si, Ti and rare earth elements was studied by means of mass-change measurements, X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is determined that addition of Si and Ti can lead to preventing formation of complex carbides like (Fe, Cr)7C3, spinels like (Fe, Cr)2O3 and nitrides like AlN. Absence of these carbides, spinels and nitrides leads to significantly improving a protective properties of surface oxide layer of Al2O3. Study of rare earth elements micro alloying showed its strong influence on adhesion of oxide layer at cyclic oxidation conditions. Heat resistance of developed coatings was compared with super alloys like RENE 80, UDIMET 710, MAR M 211.

Keywords: arc spraying, core wire, high temperature, heat resistance

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