Shear strength measurements of parallel MoSx thin films

Grosseau-Poussard, Jean-Luc; Moine, Pierre; Brendlé, M.

doi:10.1016/s0040-6090(97)00205-8

Cited by 38 publications

(38 citation statements)

References 21 publications

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“…The same was noticed for random-oriented coatings (not shown in Fig. 5 20 He found that S 0 increases from 40 MPa in dry air to 80 MPa at 60% relative humidity. The relative higher S 0 value noticed in our tests is considered as resulting from the bi-directional sliding and the higher relative humidity used in our tests.…”

Section: Resultssupporting

confidence: 74%

Fretting wear rate of sulphur deficient MoS_x coatings based on dissipated energy

Lauwerens¹,

Stals²,

et al. 2001

J. Mater. Res.

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The fretting wear of sulphur-deficient MoS x coatings with different crystallographic orientations has been investigated in ambient air of controlled relative humidity. The coefficient of friction and the wear rate of MoS x coatings sliding against corundum depend not only on fretting parameters like contact stress, fretting frequency, and relative humidity, but also strongly on the crystallographic orientation of the coatings. For randomly oriented MoS x coatings, the coefficient of friction and the wear rate increased significantly with increasing relative humidity. In contrast, basal-oriented MoS x coatings were less sensitive to relative humidity. The coefficient of friction of both types of MoS x coatings decreased on sliding against corundum with increasing contact stress and decreasing fretting frequency. A correlation between dissipated energy and wear volume is proposed. This approach allows detection in a simple way of differences in fretting wear resistance between random-and basal-oriented MoS x coatings tested in ambient air of different relative humidity.

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Section: Resultssupporting

confidence: 74%

Fretting wear rate of sulphur deficient MoS_x coatings based on dissipated energy

Lauwerens¹,

Stals²,

et al. 2001

J. Mater. Res.

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“…This behaviour is often approximated by the formula integrating the shear stress of solids at high pressures and the Hertzian model for contact pressure [39,40,41,42]:…”

Section: Discussionmentioning

confidence: 99%

Complex frictional analysis of self-lubricant W-S-C/Cr coating

et al. 2012

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Transition metal dichalcogenides belong to one of the most developed class of materials for solid lubrication. However, one of the main drawbacks of most of the self-lubricating coatings is their low load-bearing capacity, particularly in terrestrial atmospheres. In our previous works, alloying thin films based on tungsten disulfide with non-metallic interstitial elements, such as carbon or nitrogen, has been studied in order to improve tribological performance in different environments.Excellent results were reached with the deposited coatings hardness, in some cases, more than one order of magnitude higher than single W-S films. 2In this work, W-S-C films were deposited with increasing Cr contents by co-sputtering chromium and composite WS 2 -C and targets. Two films were prepared with approx. 7 and 13 at.% of Cr.Alloying with chromium led to dense films with amorphous microstructure; the hardness and adhesion was improved. Sliding tests were carried out in dry and humid air using pin-on-disc with 100Cr6 steel ball as a counterpart. To analyse the sliding process, the surfaces in the contact were investigated by X-ray photoelectron spectroscopy (bonding), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy (TEM). Surface and sub-surface structural modification of the coating and composition of the transferred tribolayer are discussed in detail. High friction in humid air was attributed to the absence of well-ordered WS 2 sliding interface. On the other hand, the existence of such interface explained a very low friction observed in dry air.

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“…Reducing the COF of Ni-based coatings, which is currently 0.4-0.7 against steel under dry lubrication, has been under continuous pursuit over the last decade. Layered materials like molybdenum disulphide (MoS 2 ) or tungsten disulphide (WS 2 ) are widely used as solid lubricants or as additives in liquid lubricants [3,4]. Their low friction performance is typically associated with easy shearing of the weak interlayer bonds (van der Waals) in these materials.…”

Section: Introductionmentioning

confidence: 99%

“…Such an extremely low lubricant can operate somewhat like an oil medium by the formation of a tribofilm between two mutually sliding surfaces. They show an extremely low coefficient of friction due to the layered structures bonded by weak van der Waal's forces facilitating interplanar shear [3][4][5][6]. However, these solid lubricants are limited to apply in vacuum.…”

Section: Introductionmentioning

confidence: 99%

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Self-lubricating Ni-P-MoS2 composite coatings

Wang

Walsh

et al. 2016

Surface and Coatings Technology

103

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Tribological coatings with low coefficients of friction are in high demand by various industries since they can improve machine efficiency and have an environmental impact. A self-lubricating Ni-P-MoS 2 composite coating has been successfully deposited on a mild steel substrate by electrodeposition. The effects of MoS 2 on the tribological coatings have been investigated. Compared to a pure Ni-P coating, the Ni-P-MoS 2 composite coating exhibited a dramatic reduction in friction coefficient against a bearing steel ball from 0.45 to 0.05. Examination and analysis of the worn surfaces and wear debris, the composite coating showed minimum wear and oxidisation compared to the severe wear and oxidation observed in the pure Ni-P coating. The evolution of MoS 2 particles in sliding wear has been elucidated.

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Shear strength measurements of parallel MoSx thin films

Cited by 38 publications

References 21 publications

Fretting wear rate of sulphur deficient MoS_x coatings based on dissipated energy

Fretting wear rate of sulphur deficient MoS_x coatings based on dissipated energy

Complex frictional analysis of self-lubricant W-S-C/Cr coating

Self-lubricating Ni-P-MoS2 composite coatings

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Shear strength measurements of parallel MoSx thin films

Cited by 38 publications

References 21 publications

Fretting wear rate of sulphur deficient MoSx coatings based on dissipated energy

Fretting wear rate of sulphur deficient MoSx coatings based on dissipated energy

Complex frictional analysis of self-lubricant W-S-C/Cr coating

Self-lubricating Ni-P-MoS2 composite coatings

Contact Info

Product

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Fretting wear rate of sulphur deficient MoS_x coatings based on dissipated energy

Fretting wear rate of sulphur deficient MoS_x coatings based on dissipated energy