Micro-abrasive wear resistance of CoB/Co<inf>2</inf>B coatings formed in CoCrMo alloy

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    Abstract

    © 2015 Elsevier B.V. New data for micro-abrasion wear resistance of CoB/Co2B coating was obtained through a ball cratering test. The coating was formed on the surface of a CoCrMo alloy using the powder-pack boriding method. The boriding process was carried out at 1223K over 5h of treatment resulting in the formation of CoB/Co2B coating with a total thickness of 28μm approximately. Both hardness and Young's modulus profile through the cobalt borides were evaluated by Berkovich depth-sensing indentation using a load of 25mN. The wear coefficients of CoB and Co2B formed on CoCrMo alloy were evaluated by a Plint TE-66 micro-abrasion tester using SiC particles dissolved in deionized water as abrasive slurry. The results demonstrated that the cobalt borides have wear coefficients higher than CoCrMo and improve their micro-abrasion wear resistance. Furthermore, a wear-mode map was developed to identify the two and three body abrasion mechanisms and the transition between them modifying the concentration of SiC in the slurry and the magnitude of applied load.
    Original languageAmerican English
    Pages (from-to)258-263
    Number of pages231
    JournalSurface and Coatings Technology
    DOIs
    StatePublished - 25 Dec 2015

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