Nanoparticle dispersion-strengthened coatings and electrode materials for electrospark deposition |
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Authors: | EA Levashov PV Vakaev AE Kudryashov DV Shtansky A Sanz |
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Affiliation: | a Moscow State Institute of Steel and Alloys, Technological University, Leninsky pr., 4, Moscow 119049, Russia b Air Force Research Laboratory, 2941 Hobson Way, Wright Patterson AFB, OH 45433, United States c SKF Engineering and Research Centre, P.O. Box 2350 Kelvinbaan 16, 3430 DT Nieuwegein, 3439 MT Nieuwegein, The Netherlands |
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Abstract: | Advanced electrode compositions were developed using self-propagating high-temperature synthesis (SHS). Electrospark deposition (ESD) was applied to produce tribological coatings which were disperse-strengthened by incorporation of nanosized particles. Nanostructured electrodes of cemented carbides were produced using powder metallurgy technologies. They allow increasing the coatings density, thickness, hardness, Young's modulus and wear resistance. Positive effects of the nanostructure of electrodes on the deposition process and structure and properties of the coatings are discussed. In that case the tungsten carbide phases become predominant in the coatings. A mechanism of the dissolution reaction of WC with Ni at the contact surface of electrode was proposed. It was shown that the formation of the coating structure starts on the electrode and is accomplished on the substrate. |
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Keywords: | Electrospark deposition (ESD) Nanosized additives WC-Co nanostructured electrodes Microstructure Coating |
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