Effect of Substrate Surface Finish on the Lubrication and Failure Mechanisms of Molybdenum Disulfide Films

Fusaro, Robert L.

doi:10.1080/05698198208983076

Cited by 60 publications

(23 citation statements)

References 15 publications

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“…It could also be due to formation of a protective transfer film. Previously Fusaro [31] has shown that soft, ductile films of MoS 2 on rough surfaces can act as lubricant reservoirs. We speculate that a protective film could be supplied by the softened oxides trapped in the reservoir valleys of the roughly polished alumina surface.…”

Section: Coating Friction and Wearmentioning

confidence: 99%

Ion-beam deposited Cu-Mo coatings as high temperature solid lubricants

Wahl

Seitzman

Bolster

et al. 1997

Surface and Coatings Technology

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Section: Coating Friction and Wearmentioning

confidence: 99%

Ion-beam deposited Cu-Mo coatings as high temperature solid lubricants

Wahl

Seitzman

Bolster

et al. 1997

Surface and Coatings Technology

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“…Sliney, using real-time optical analysis, has shown how loose MoS 2 debris can be extruded through the sliding contact and incorporated as both transfer film and track material [12]. Fusaro has also documented similar retransfer processes for MoS 2 [13] and other solid lubricants [14]. Fleischauer et al [4] and Singer et al [5] have shown that early loss of lubricant from tracks correlates with buildup of transfer film on the counterface, and Lancaster [15] has argued that transfer films play a crucial role in the endurance of solid lubricants.…”

mentioning

confidence: 95%

Quantification of a lubricant transfer process that enhances the sliding life of a MoS2 coating

Wahl

Singer

1995

Tribol Lett

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A lubricant transfer process that enhanced the wear life of a MoS 2 coating has been identified and quantified. A steel ball sliding against a coated steel flat in reciprocating motion produced reservoirs at the turnaround part of the track ends, then emptied them, to provide replenishment similar to what is expected of liquid lubricants. The dynamics of the process were inferred from measurements of material loss and/or buildup in the track and on the ball; measurements were performed with Michelson interferometry and energy dispersive x-ray spectroscopy. MoS 2 is a remarkable solid lubricant. It produces some of the lowest friction coefficients ever measured [1], and it can be used to lubricate sliding contacts at high contact stresses (on the order of GPa) even though its shear strength is only ~25 MPa. In addition, thin coatings of MoS 2 can withstand hundreds of thousands of sliding cycles, having overall wear rates <<1 nm/cycle. Although some of its behavior can be explained in terms of the bulk mechanical properties of MoS 2 (e.g. low friction coefficient in terms of the plasticity/shear strength), the high endurance has never been accounted for. Furthermore, while MoS 2 provides endurant sliding, it is well known that most of the coating is lost early in life, both in sliding [2,3,4,5] and rolling [6]. How, then, does the remaining lubricant sustain sliding?We began this study to learn how a coating, worn heavily early in sliding, was able to endure the remaining 90% of sliding life [7]. But our investigation led to the recognition that the endurance was influenced not only by the coating wear rate but also by a lubricant replenishment process. This

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“…Transfer films are formed on the first pass [13,14,15], and MoS 2 debris can be extruded through the sliding contact and exchanged between transfer film and track surfaces [16,17]. Transfer film buildup has been correlated to lubricant loss in the track [4,13,14], and the importance of the transfer film for endurance of solid lubricants has long been noted by Lancaster [18].…”

Section: Discussionmentioning

confidence: 99%