Abstract No.:
3886

 Scheduled at:
Wednesday, May 21, 2014, Hall A 2:20 PM
Comparision Thermal Spraying VS. other Surface Technologies


 Title:
Arc sprayed wear resistant coatings from iron-based cored wires as an alternative to hard chrome plating

 Authors:
Hanna Pokhmurska* / Institute of Material Science and Engineering, Chemnitz University of Technology , Germany
Mykhajlo Student/ Karpenko Physico-Mechanisches Institut der Nationalen Wissenschaftlichen Akademie der Ukraine, Ukraine
Taras Stypnutskyy/ Karpenko Physico-Mechanisches Institut der Nationalen Wissenschaftlichen Akademie der Ukraine, Ukraine
Vasyl Pokhmurskii/ Karpenko Physico-Mechanisches Institut der Nationalen Wissenschaftlichen Akademie der Ukraine, Ukraine
Bernhard Wielage/ Institute of Materials Science and Engineering, Chemnitz University of Technology, Germany

 Abstract:
Arc-sprayed coatings from cored wires based on Fe-Cr-B-Al and Fe-Cr-C-Al systems with chromium content higher than 13% have been developed for the renewal of valves sealing surfaces as an alternative for hard chromium coatings. It was shown that good corrosion resistance and high abrasive wear resistance of arc sprayed coatings have been achieved in the case, when the ferroalloys containing boron and titanium were added to filling powder mixture. This leads to the formation of eutectics between the powder components as well as with a steel sheath of cored wire. Tribologic behavior of the developed arc-sprayed coatings under the conditions of sliding wear has been investigated. Friction coefficients both by dry friction and with graphite lubrication have been investigated. It was shown that the improvement of the tribological properties of such friction couple is due to accumulation of the graphite in the pores of arc-sprayed coating. Further improvement of wear resistance of the arc-sprayed coatings was observed in the case of their sealing with synthetic oil and following annealing at 300Ú C during 1h that causes the formation of stable protective film at the surface and thus provides an increase of wear resistance.

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