TRIBOLOGICAL PROPERTIES OF NICKEL ELECTROLITYCAL ALLOYS AFTER HEAT TREATMENT
Journal Title: Tribologia - Year 2011, Vol 238, Issue 4
Abstract
This paper describes the tribological properties (linear wear) of the electrolytic coatings containing nickel alloys, Ni-Mo and Ni-W, which contain carbides forming elements. These coatings were also subjected to heat treatment and thermo-chemical treatment. Coatings made of nickel alloys Ni-Mo, Ni-W and of nickel Ni, were deposited on the surface of samples from C90U steel and heated to a temperature 1125oC for 8 h, under lowered pressure 10-2÷10 Pa. The research also included examinations of duplex layers, CrC+(Ni-Mo) and CrC+(Ni-W), manufactured in the process of vacuum chromizing on the surface of specimens from C90U steel, which were coated with the same nickel alloys before chromizing. Tribological properties of layers were determined with the 3 roller–cone method. Test indicated that diffusion layers Ni-W, obtained during the heat treatment, have higher wear resistance than layers Ni-Mo. However, duplex layers, obtained during the vacuum chromizing of C90U steel coated with Ni-W or Ni-Mo coatings, have higher wear resistance than both other layers.<br/><br/>
Authors and Affiliations
Bogdan Bogdański, Ewa Kasprzycka, Jerzy Smolik, Jan Tacikowski, Wiktor Grzelecki
Keywords
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