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Zhang, Xiaoling; Prakash, B; Lauwerens, W.; Zhu, Xiaodong; He, Jiankang; Célis, Jean-Pierre

doi:10.1023/a:1021760405423

Cited by 18 publications

(12 citation statements)

References 17 publications

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“…Over the next 10 scans, the friction coefficient decreases to a minimum of 1.5×10 −2 and remains remarkably constant at this low value. This value is within the range found for similar lamellar MoS 2 films [23][24][25][26]. Sliding was terminated after 40 scans, following which two experiments were performed.…”

Section: Resultssupporting

confidence: 69%

“…The friction coefficient of the FeCl 2 film is rather low (∼0.08) and likely reflects the layer structure of FeCl 2 , which is similar to that of MoS 2 , which exhibits a similarly low friction coefficient [23][24][25][26]. The values measured for the film evaporated onto iron in ultrahigh vacuum here are very similar to those found for reactively formed halide films [3][4][5].…”

Section: Discussionsupporting

confidence: 74%

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The friction, mobility and transfer of tribological films: potassium chloride and ferrous chloride on iron

Gao

Kotvis

2004

Wear

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The tribological properties of FeCl 2 , measured using an ultrahigh vacuum tribometer, are compared with those of KCl. The friction coefficient of an FeCl 2 film evaporated onto iron in ultrahigh vacuum decreases to ∼0.08 after the deposition of a film ∼40 Å thick. This value is in good agreement with that measured for reactively formed FeCl 2 films in a pin and v-block apparatus. The contact resistance also increases at the same FeCl 2 thickness as that at which the friction coefficient reaches its minimum value suggesting that this corresponds to the completion of the first monolayer as found previously for KCl. Comparison of the friction coefficients and contact resistances for a second pass suggests that the film is mobile during rubbing in both cases. It is found that repeated rubbing in the case of FeCl 2 leads to a reduction in friction coefficient to ∼0.015 which is shown to be due to the formation of a transfer film on the tribotip. In contrast, no such reduction is found for a KCl film up to 40 cycles, implying that no transfer film is formed in that case. It is also found that, while friction reduction requires the surface to be completely covered by the halide film, suppression of damage in the iron requires the deposition of films thicker than ∼500 Å.

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Section: Resultssupporting

confidence: 69%

Section: Discussionsupporting

confidence: 74%

The friction, mobility and transfer of tribological films: potassium chloride and ferrous chloride on iron

Gao

Kotvis

2004

Wear

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“…By using a PVD process, deposition parameters can be optimized to gain coatings with a more textured structure orienting the (002) basal planes parallel to the substrate surface [9]. A similar concept has been used by Koch et al [5] for coatings developed for support elements in the superconducting magnet system of the WENDELSTEIN W7-X fusion experiment.…”

Section: Introduction-lubricating Properties Of Mosmentioning

confidence: 99%

“…Other authors report friction coefficients between 0.015 and 0.06 in liquid nitrogen (LN2) and minimum wear on both sliding surfaces for Ti containing PVD-MoS2 coatings [10,11]. By using a PVD process, deposition parameters can be optimized to gain coatings with a more textured structure orienting the (002) basal planes parallel to the substrate surface [9]. A similar concept has been used by Koch et al [5] for coatings developed for support elements in the superconducting magnet system of the WENDELSTEIN W7-X fusion experiment.…”

Section: Introduction-lubricating Properties Of Mosmentioning

confidence: 99%

Tribological Performance of MoS2 Coatings in Various Environments

Gradt

Schneider²

2016

Lubricants

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Molybdenum disulfide (MoS 2 ) is a well-known solid lubricant for tribosystems running in vacuum or dry gases. Problems arise due to its sensitivity to humidity, which is a drawback for its application under ambient conditions. However, by using a physical vapor deposition (PVD) process, deposition parameters can be optimized not only to gain a coatings structure with favorable frictional properties but also to minimize the sensitivity to attack by water molecules. Therefore, an improved tribological behavior even under moist conditions can be achieved. MoS 2 coatings are also candidates for being applied at cryogenic temperatures. They already have proven their suitability, e.g., for sliding support elements between superconducting magnets of the nuclear fusion-experiment Wendelstein 7-X. However, these coatings were exclusively produced for this particular application and the utilization for more common tribosystems may be precluded due to cost considerations. In view of a wider range of applications, pure and Cr containing PVD-MoS 2 coatings with an optimized structure were tested under varying environments including hydrogen gas and cryogenic temperatures. Results of the most promising variant are presented in this paper.

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“…However, when it is exposed to humid air, its tribological performance deteriorates since 2H plates tend to stick to the mating metal pieces through the reactive dangling bonds on the prismatic edges (0110), and lead to their rapid annihilation through burnishing and oxidation [2]. Recently, there has significant industrial interest in developing MoS x solid lubricant coatings for use in humid air conditions [3]. Many researchers referred that adding metals (Ni, Au, Ti, Cr) can effectively improve the endurance and oxidation resistance of MoS x -metal co-sputtered films in ambient air [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of deposition pressure on microstructure and tribological behavior of MoS x /MoS x -Mo nanoscale multi-layer films

Chen

Zhang

et al. 2007

Tribol Lett

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MoS x /MoS x -Mo multi-layer films consisted of several bilayers and a surface layer on steel substrate were deposited by d.c. magnetron sputtering at different deposition pressures. Each bilayer contained a MoS x layer with 80 nm in thickness and a MoS xMo composite layer with 20 nm in thickness. With the increase of deposition pressure, the perpendicular orientation of the basal plane prevailed while the parallel orientation decreased. The tribological properties of the multi-layer films were investigated by using a ball-on-disk tribometer both in vacuum and in humid air. The multi-layer film deposited at 0.24 Pa had a compact, consistent layered structure with high intensity of (002) plane and low S content compared to the others deposited at 0.32 and 0.40 Pa, and showed the lowest friction coefficient and wear rate in humid air.

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Untitled

Cited by 18 publications

References 17 publications

The friction, mobility and transfer of tribological films: potassium chloride and ferrous chloride on iron

The friction, mobility and transfer of tribological films: potassium chloride and ferrous chloride on iron

Tribological Performance of MoS2 Coatings in Various Environments

Effect of deposition pressure on microstructure and tribological behavior of MoS x /MoS x -Mo nanoscale multi-layer films

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