On the Mechanisms of MoS<sub>2</sub>-Film Failure in Sliding Friction

Gee, A.W.J. de; Salomon, G.; Zaat, J.H.

doi:10.1080/05698196508972089

Cited by 52 publications

(7 citation statements)

References 6 publications

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“…The lubricatIng mechanism proposed in t;nis paper and reference 13 also extends the results of De Gee et al (9) by proposing that the lubricating mechanism is more than just a simple sintering together of the MoS 2 particles. The lubrication process was found to be very dynamic and appears to be due to the plastic flow of individual, MoS 2 particles.…”

Section: Discussionsupporting

confidence: 57%

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

Fusaro

1982

A S L E Transactions

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Section: Discussionsupporting

confidence: 57%

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

Fusaro

1982

A S L E Transactions

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“…• MoSz coatings, both burnished [55] and ion-beam sputtered [56], survive 100-1000 times longer in dry air than in moist air. • Monolayers of fatty acids have 1 to 2 orders of magnitude higher endurance on glass than on steel [57] [See, also, the chapter by Timsit] • MoS2 coatings can last twice as long on ceramics as on steel [22,58].…”

Section: Effect Of Repeated Passesmentioning

confidence: 99%

Solid Lubrication Processes

Singer

1992

Fundamentals of Friction: Macroscopic and Microscopic Processes

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ABSTRACT. Solid lubricant behavior and lubrication by thin solid films are reviewed. Crystalline as well as non-crystalline solids are shown to give low friction, as are surface films as thin as a monolayer. The Bowden-Tabor adhesion model of friction is shown to be particularly useful for measuring the shear strength of thin solid films under elastic Hertzian contact conditions. However, the meaning of the "shear strength" as a materials property is called into question because of the effects of atmosphere on the friction coefficient. Mechanisms of II shear" are then examined from a microscopic point of view. Microscopic studies of the rheological behavior of solid lubricants suggest that interfacial films play an important role in accommodating sliding motion.Several recent investigations of interfacial films generated during dry sliding against coatings and surface treatments are presented. Surface analytical studies of interfacial films from diamond-like carbon and MoS 2 coatings and Ti+-implanted steel provide evidence that tribochemical reactions tie place between counterfaces, surfaces and the atmosphere. A model that accounts for the tribochemical films generated during sliding contact is described, and a thermochemical basis for the reactions governing film formation is presented. These studies suggest that the lubricity of coatings is determined by the interfacial films generated during sliding, not by the bulk properties of the coatings themselves.

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“…A consensus was formed by those investigating the effect of moisture on MoS 2 , namely that increasing the relative humidity, or the amount of adsorbed water vapor, increased the coefficient of friction when MoS 2 was used as a lubricant between sliding surfaces [1][2][3][4]. In addition to water vapor, the effect of adsorbing oxygen on MoS 2 films has been investigated [5,6], and has been shown to increase the friction and wear rate of MoS 2 [7,8]. When MoS 2 is in the presence of oxygen, oxidation can occur, resulting in MoO 3 .…”

Section: Introductionmentioning

confidence: 99%

A Raman Spectroscopic Study of MoS2 and MoO3: Applications to Tribological Systems

2011

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Molybdenum disulfide (MoS 2 ) and molybdenum trioxide are investigated using Raman spectroscopy with emphasis on the application to tribological systems. The Raman vibrational modes were investigated for excitation wavelengths at 632.8 and 488 nm using both micro-crystalline MoS 2 powder and natural MoS 2 crystals. Differences are noted in the Raman spectra for these two different wavelengths, which are attributed to resonance effects due to overlap of the 632.8 nm source with electronic absorption bands. In addition, significant laser intensity effects are found that result in laser-induced transformation of MoS 2 to MoO 3 . Finally, the transformation to molybdenum trioxide is explored as a function of temperature and atmosphere, revealing an apparent transformation at 375 K in the presence of oxygen. Overall, Raman spectroscopy is an useful tool for tribological study of MoS 2 coatings, including the role of molybdenum trioxide transformations, although careful attention must be given to the laser excitation parameters (both wavelength and intensity) when interpreting Raman spectra.

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On the Mechanisms of MoS₂-Film Failure in Sliding Friction

Cited by 52 publications

References 6 publications

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

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

Solid Lubrication Processes

A Raman Spectroscopic Study of MoS2 and MoO3: Applications to Tribological Systems

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On the Mechanisms of MoS2-Film Failure in Sliding Friction

Cited by 52 publications

References 6 publications

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

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

Solid Lubrication Processes

A Raman Spectroscopic Study of MoS2 and MoO3: Applications to Tribological Systems

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On the Mechanisms of MoS₂-Film Failure in Sliding Friction