Hybrid Co-Cr/W-WC and Ni-W-Cr-B/W-WC coating systems

  1. Get@NRC: Hybrid Co-Cr/W-WC and Ni-W-Cr-B/W-WC coating systems (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1007/s11666-015-0357-5
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Journal titleJournal of Thermal Spray Technology
Pages346356; # of pages: 11
SubjectCoatings; Cobalt; Corrosion; Corrosion resistance; Electrochemical impedance spectroscopy; Load limits; Load testing; Loads (forces); Nickel; Stainless steel; Tribology; Tungsten carbide; Wear of materials; 316 stainless steel; Hybrid coating systems; Reciprocating tribometer; Rockwell indentation; Stress induced phase transformations; Sub-surface materials; Tribological properties; tribomechanical properties; Thin films
AbstractThe aim of this study was to investigate the effects of subsurface materials on the performance of a wear-resistant thin film. The mechanical, tribological, and corrosion properties were assessed for two hybrid coating systems: (1) W-WC thin film and a laser cladded Co-Cr interlayer applied to a 316 stainless steel substrate and (2) the same W-WC thin film and a spray-and-fused Ni-W-Cr-B interlayer applied to an Inconel® 718 substrate. They were then compared to the same systems without an interlayer. The microstructures were analyzed by XRD, EDS, and SEM. The hardness and surface load-carrying capacity of the coating systems were determined by micro- and macrohardness testing. Rockwell indentation was used to assess coating adhesion (CEN/TS 1071-8). Tribological properties were assessed with a reciprocating tribometer, and corrosion resistance was determined by potentiodynamic polarization and electrochemical impedance spectroscopy. The originality of this work lies in the finding that, except for the Inconel 718/Ni-W-Cr-B/W-WC system, the wear rate decreases with decreasing hardness of the subsurface materials carrying the thin film due to the decreasing contact pressure for a given load. Another novel finding is the stress-induced phase transformation of the Co-Cr interlayer, which occurs beneath the thin film under high load.
Publication date
PublisherSpringer International Publishing
AffiliationNational Research Council Canada; Automotive and Surface Transportation
Peer reviewedYes
NPARC number21277482
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Record identifierc9f4b659-1e74-4a37-8416-23eff86454dd
Record created2016-03-09
Record modified2016-05-09
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