A comparison of oxidation and oxygen substitution in MoS2 solid film lubricants

Fleischauer, Paul D.; Lince, Jeffrey R.

doi:10.1016/s0301-679x(99)00088-2

Cited by 167 publications

(123 citation statements)

References 21 publications

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“…Two ways for oxygen intake into MoS 2 have been described. Each one corresponds to different effects on the performance of MoS 2 as a lubricant [3]. The first mechanism takes place during the production of the coating.…”

Section: Lubricant Coatingmentioning

confidence: 99%

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MoS2 coatings for the narrow support elements of the W-7X nonplanar coils

Koch

Nocentini

Heinemann

et al. 2007

Fusion Engineering and Design

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WENDELSTEIN 7-X (W7-X) is a stellarator presently under construction and assembly in Greifswald, Germany. The superconducting magnet system of W7-X consists of planar and non planar coils. The electromagnetic forces on the superconducting magnet are supported by backing of all coils against a central ring and by wedging among coil casings through "Narrow Support Elements" (NSE) that have to satisfy very specific requirements. Anti friction MoS 2 coatings have been developed and tested at room and cryogenic temperature (77K) to allow relative sliding of adjacent coils under load without stickslip to avoid coil quenching. The influence of thickness on the coating endurance has been demonstrated. To prevent ageing both constructive methods and protective top coats have been investigated. This paper describes the atomic sputter deposition technique, the reduced and full-scale tribological tests, ageing tests and arrangements to protect the coatings from humidity and oxidation which have been carried on so far.

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Section: Lubricant Coatingmentioning

confidence: 99%

“…These lubricating bonded films are used particularly in air and space travel and are applicable according to manufacturer data down to -200 °C. However the lifetime of these films is limited compared with sputtered layers [3].…”

Section: Lubricant Coatingmentioning

confidence: 99%

MoS2 coatings for the narrow support elements of the W-7X nonplanar coils

Koch

Nocentini

Heinemann

et al. 2007

Fusion Engineering and Design

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“…However, different oxidation rates at ambient condition were investigated, and it was found the crystallite orientation plays an important role in the oxidation process [45]. Oxidation leads to a higher friction coefficient, enhanced wear rate, and hence a shorter wear life [36,46]. The ratio of MoS 2 /MoO 3 in the reference coatings indicates that oxidation had occurred but the major portion is still MoS 2 .…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Particles can be observed in the troughs, which were located between every two peaks. White particles (Figure 3a,f) can be MoO3, the oxidation product of MoS2, which has a negative effect on the performance [15,36]. As shown in Table 4, in hybrid coatings, MoO3 possesses larger portion than MoS2.…”

Section: Wearmentioning

confidence: 99%

The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials

et al. 2018

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Abstract:The potential of the combination of hard and soft coating on elastomers was investigated. Diamond-like carbon (DLC), molybdenum disulfide (MoS 2 ) and composite coatings of these two materials with various DLC/MoS 2 ratios were deposited on four elastomeric substrates by means of the magnetron sputtering method. The microstructures, surface energy of the coatings, and substrates were characterized by scanning electron microscopy (SEM) and contact angle, respectively. The chemical composition was identified by X-ray Photoelectron Spectroscopy (XPS). A ball on disc configuration was used as the model test, which was performed under dry and lubricated conditions. Based on the results from the model tests, the best coating was selected for each substrate and subsequently verified in component-like test. There is not one coating that is optimal for all substrates. Many factors can affect the coatings performance. The topography and the rigidity of the substrates are the key factors. However, the adhesion between coatings and substrates, and also the coating processes, can impact significantly on the coatings performance.

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“…This substitutional oxygen interlocks or notches the basal plane surface, which further increases the friction. Also, increasing the percentage of substitutional oxygen decreases friction during sliding, but this friction is always higher, compared to pure MoS 2 films [76]. The friction coefficient of some MoS 2 coatings is listed in Table 9.2.…”

Section: Effect Of Temperature and Relative Humidity On Friction Of Mmentioning

confidence: 99%

Coatings Tribology

Ingole¹

2013

Tribology for Scientists and Engineers

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Optimization of coefficient of friction in association with minimum wear is a general requirement to reduce energy consumption due to friction and wear losses. Lubrication such as solid and liquid is utilized to meet low friction and wear demands. Extreme environmental conditions such as space and hightemperature applications limit their usefulness. There is a need to design newer class of coatings for such applications. Design and selection parameters of coatings and their tribology are discussed in this chapter. These parameters include scaledependent failure modes (nano-and micrometer length scale), state of stress at the interface, material properties, and chemical interactions at the interface. The requirements for selection of coating for friction applications are included. Tribology of low-friction coatings such as graphite, molybdenum disulfide, diamond-like carbon, chromium-based coatings, and polymeric coatings is discussed. Effects for service conditions such as load, nitrogen, humidity, and temperature for selected coatings are listed. Knowledge of the interfacial phenomena plays very important role in selection and development of coatings for tribological applications.

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A comparison of oxidation and oxygen substitution in MoS2 solid film lubricants

Cited by 167 publications

References 21 publications

MoS2 coatings for the narrow support elements of the W-7X nonplanar coils

MoS2 coatings for the narrow support elements of the W-7X nonplanar coils

The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials

Coatings Tribology

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