STP1278: Friction and Wear of Self-Lubricating TiN-MoS2 Coatings Produced by Chemical Vapor Deposition

    Blau, PJ
    Oak Ridge National Laboratory, Oak Ridge, TN

    Yust, CS
    Oak Ridge National Laboratory, Oak Ridge, TN

    Bae, YW
    Oak Ridge National Laboratory, Oak Ridge, TN

    Besmann, TM
    Oak Ridge National Laboratory, Oak Ridge, TN

    Lee, WY
    Oak Ridge National Laboratory, Oak Ridge, TN

    Pages: 13    Published: Jan 1996


    Abstract

    The purpose of the work reported here was to develop special chemical vapor deposition (CVD) methods to produce self-lubricating ceramic coatings in which the lubricating and structural phases were co-deposited on Ti-6Al-4V alloy substrates. These novel composite coatings are based on a system containing titanium nitride and molybdenum disulfide. The method for producing these coatings and their sliding behavior against silicon nitride counterfaces, in the temperature range of 20 to 700°C in air, are described. The initial sliding friction coefficients for the composite coatings at room temperature were 0.07 to 0.30, but longer-term transitions to higher friction occurred, and specimen-to-specimen test variations suggested that further developments of the deposition process are required to assure repeatable friction and wear results. Friction and wear tests at 300 and 700°C produced encouraging results, but tests run at an intermediate temperature of 400°C exhibited friction coefficients of 1.0 or more. Oxidation and a change in the nature of the debris layers formed during sliding are believed to be responsible for this behavior.

    Keywords:

    friction properties, wear testing, chemical vapor deposition, titanium nitride, surface coatings, molybdenum disulfide, self-lubricating materials, surface treatments


    Paper ID: STP16100S

    Committee/Subcommittee: G02.50

    DOI: 10.1520/STP16100S


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