Mechanical and tribological performance of MoS2 co-sputtered composites

Simmonds, M.C.; Savan, Alan; Pflüger, E.; Swygenhoven, H. Van

doi:10.1016/s0257-8972(00)00521-1

Cited by 124 publications

(81 citation statements)

References 15 publications

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“…There are several reports dealing with thin films based on TMD alloyed with metals, such as (Ti [6,7,27], Al [28], Au [29,30], Pb [31], Ni [32,33], Cr [34,35]); the effects of doping metal on the coating structure, density, or mechanical properties are well studied. However, the role of doping metal in the tribological contact remains reactions of the metals with residual atmosphere in the deposition chamber, particularly with oxygen.…”

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2012

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“…MoS 2 -based films have been shown to have superior properties when mixed with small amounts of various metals (generally > 10%) during sputter-deposition [1][2][3][4][5][6][7][8][9] or other ion-based deposition techniques [10]. Such films have been used for a number of years for specialized applications like ball bearings on spacecraft [6][7][8], and for terrestrial machining applications [9].…”

Section: Introductionmentioning

confidence: 99%

Tribology of Co-sputtered Nanocomposite Au/MoS₂Solid Lubricant Films over a Wide Contact Stress Range

Lince¹

2004

Tribology Letters

101

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of Information. SPONSOR/MONITOR'S ACRONYM(S) SMC SPONSOR/MONITOR'S REPORT NUMBER(S)SMC-TR-05-12 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTSlip-ring assemblies for spacecraft, and other sliding electrical contacts, require low friction and wear, as well as low electrical resistance and noise. Most current slip-ring technologies (both solid-and liquid-lubricated) are over forty years old, and their robustness is often less than satisfactory. Newer technologies have been developed, but have also shown limitations in spacecraft applications. We are investigating alternate material technologies to address these issues, concentrating on sputter-deposition of metals (e.g., gold) containing solid lubricants (e.g., MoS 2 ) to form electrically conductive, lubricious nanocomposite films. In the present study, we investigated the friction and endurance of co-sputtered Au/MoS 2 films in sliding contact in N 2 gas at different contact stresses. Seven different film compositions were studied. Films with higher metal contents were found to perform especially well at low contact stresses, which is the regime where sliding electrical contacts operate (i.e., <1 MPa). Auger Nanoprobe analysis was used to reveal how low friction is produced, even at contact stresses well below that usually used in MoS 2 -lubricated systems. SUBJECT TERMS

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“…Improving this tribological performance has been an active area of study particularly for space components that require testing or storage periods on Earth. Increased wear resistance and load bearing capacity has been reported by alloying with metals (Ti, Au, Pb, Ni, Cr) 12 or non-metals (N or carbon) 13 2 21 ) have been also studied in the past. One of the most studied systems have been the transition metal dichalcogenides mixed with carbon by Polcar & Cavaleiro by co-sputtering of the metal sulfides or selenides with graphite.…”

Section: Introductionmentioning

confidence: 99%

Self-Lubricity of WSe_x Nanocomposite Coatings

Domínguez-Meister

Conte

Igartua

et al. 2015

ACS Appl. Mater. Interfaces

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Transition metal chalcogenides with lamellar structure are known for their use in tribological applications although limited to vacuum due to their easy degradation in presence of oxygen and/or moisture. Here we present a tailored WSe x coating with low friction (0.07) and low wear rates (3×10 -7 mm 3 Nm -1 ) even in ambient air. To understand the low friction behaviour and lower chemical reactivity a tribological study is carried out in a high vacuum tribometer under variable pressures (atmospheric pressure to 10 -8 mbar). A detailed investigation of the film nanostructure and composition by advanced transmission electron microscopy techniques with nanoscale resolution determined that the topmost layer is formed by nanocrystals of WSe 2 embedded in an amorphous matrix richer in W, a-W(Se). After the friction test, an increased crystalline order and orientation of WSe 2 lamellas along the sliding direction 2 have been observed in the interfacial region. Based on high angle annular dark field, scanning transmission electron microscopy and energy dispersive X-ray analysis, the release of W atoms from the interstitial basal planes of the a-W(Se) phase is proposed.These W atoms reaching the surface, play a sacrificial role preventing the lubricant WSe 2 phase from oxidation. The increase of the WSe 2 crystalline order and the buffer effect of W capturing oxygen atoms would explain the enhanced chemical and tribological response of this designed nanocomposite material.

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Mechanical and tribological performance of MoS2 co-sputtered composites

Cited by 124 publications

References 15 publications

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

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

Tribology of Co-sputtered Nanocomposite Au/MoS₂Solid Lubricant Films over a Wide Contact Stress Range

Self-Lubricity of WSe_x Nanocomposite Coatings

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Mechanical and tribological performance of MoS2 co-sputtered composites

Cited by 124 publications

References 15 publications

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

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

Tribology of Co-sputtered Nanocomposite Au/MoS2Solid Lubricant Films over a Wide Contact Stress Range

Self-Lubricity of WSex Nanocomposite Coatings

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Product

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Tribology of Co-sputtered Nanocomposite Au/MoS₂Solid Lubricant Films over a Wide Contact Stress Range

Self-Lubricity of WSe_x Nanocomposite Coatings