Reciprocating sliding tests with ball-on-flat geometry were performed on a duplex coating at low speeds in moist air (RH = 60%). The coating. 55 nm MoS 2 on 35 nm of TiN, was deposited by ion-beam assisted deposition onto a steel substrate. Friction coefficient (μ) and electrical contact resistance ( R c ) measurements were recorded at ∼ 2 μm intervals along the track: these spatially resolved measurements were compared to the more commonly presented cycle-averaged values. The last-cycle tracks of several runs were also analyzed by a variety of microscopies and spectroscopies to identify compositions and determine thickneses of films on the tracks and balls. R c measurements, both averaged and spatially resolved, were more sensitive to coating damage and loss than μ measurements. In the averaged data, fluctuations in R c were observed before fluctuations in μ. Spatially resolved data showed that local drops in R c could be detected as early as 20% of life. Additionally, recovery of both high μ and low R c regions, interpreted as healing of damage in the contact, occured. Friction coefficient data were insensitive to changes in MoS 2 coating thickness; conversely. R c followed wear track thickness and consequently may provide an in situ method of monitoring coating wear.
Wear – Elsevier
Published: Feb 1, 1998
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