An investigation of material and tribological properties of Sb2O3/Au-doped MoS2 solid lubricant films under sliding and rolling contact in different environments

Singh, Harpal; Mutyala, Kalyan C.; Evans, Ryan D.; Doll, Gary L.

doi:10.1016/j.surfcoat.2015.05.049

Cited by 52 publications

(16 citation statements)

References 37 publications

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“…Adjacent layers are formed by weak van der Waals forces [1,2]. MoS 2 has many excellent properties and has been widely used in many fields, such as desulfurization [3,4], low consumption film transistors [5,6], and solid lubricants [7,8], because of its unique structure and is a 2D material with Dirac cone structure [9,10]. MoS 2 film materials have excellent electrical and optical characteristics [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Deposition and Annealing Temperature on the Structure and Optical Band Gap of MoS2 Films

Chen

Cui

et al. 2020

Materials

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In this study, molybdenum disulfide (MoS2) film samples were prepared at different temperatures and annealed through magnetron sputtering technology. The surface morphology, crystal structure, bonding structure, and optical properties of the samples were characterized and analyzed. The surface of the MoS2 films prepared by radio frequency magnetron sputtering is tightly coupled and well crystallized, the density of the films decreases, and their voids and grain size increase with the increase in deposition temperature. The higher the deposition temperature is, the more stable the MoS2 films deposited will be, and the 200 °C deposition temperature is an inflection point of the film stability. Annealing temperature affects the structure of the films, which is mainly related to sulfur and the growth mechanism of the films. Further research shows that the optical band gaps of the films deposited at different temperatures range from 0.92 eV to 1.15 eV, showing semiconductor bandgap characteristics. The optical band gap of the films deposited at 200 °C is slightly reduced after annealing in the range of 0.71–0.91 eV. After annealing, the optical band gap of the films decreases because of the two exciton peaks generated by the K point in the Brillouin zone of MoS2. The blue shift of the K point in the Brillouin zone causes a certain change in the optical band gap of the films.

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Section: Introductionmentioning

confidence: 99%

Effects of Deposition and Annealing Temperature on the Structure and Optical Band Gap of MoS2 Films

Chen

Cui

et al. 2020

Materials

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“…On the other hand, WS 2 films exhibit great thermal stability, a working temperature higher than that exhibited by MoS 2 (approximately 100 °C) and COFs between 0.02 and 0.06 under controlled conditions [8,9]. Nevertheless, similar to the other TMDs, when WS 2 is exposed to atmospheres that contain oxygen and water vapor, its intrinsic imperfections increase, rapidly deforming the crystalline structure; its lubricant properties and wear resistance then decrease dramatically [4]. To address this issue, researchers around the world have performed experiments focused on doping this material with various metallic (Ni, Au, Pb, Ti, Al) and non-metallic (C, PbO, Sb 2 O 3 , ZnO) elements [1,9] to obtain a stable structure and to avoid excessive wear caused by triboxidation.…”

Section: Introductionmentioning

confidence: 99%

“…This type of material exhibits good performance under high-pressure and high-temperature conditions, in which a conventional lubricant may exhibit problems such as migration, evaporation and chemical instabilities [4]. Among the various solid lubricants, the transition-metal dichalcogenides (TMD) (sulfides, selenides or tellurides of tungsten, molybdenum and niobium) are intrinsic lubricants that have been studied over the past 50 years.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Titanium Doped Tungsten Disulfide Thin Films Produced via the Magnetron Co-Sputtering DC Technique

Carmona

Sequeda

2016

Matéria (Rio J.)

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In this work, titanium doped tungsten disulfide thin films (WS 2 -Ti) were deposited on AISI 304 stainlesssteel substrates using the magnetron co-sputtering DC technique. Films were produced with varying titaniumcathode power from 0 to 25 W. The titanium content of the WS 2 structure was determined using energy dispersive spectroscopy (EDS), thereby obtaining a maximum of 10% for the sample grown at 25 W. X-ray diffraction (XRD) results indicated, for the pure sample, the presence of a hexagonal phase of high intensity on the (103) plane. However, with the addition of titanium, the WS 2 crystallinity was reduced; nevertheless, when the titanium content was equal to 10%, nanocomposite formation was promoted. This effect was observed in TEM (transmission electron microscopy) images. Finally, the tribological behavior was determined using a ball on disk (BOD) test. With this method, friction coefficient curves were obtained with respect to the number of cycles, allowing the measurement of friction coefficient values of 0.1 for the pure sample and 0.15 for the sample grown at 5 W. Because of the low thickness of the samples, all of them failed during the first cycles.

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“…Previous studies [6,22] have shown that MoS 2 coatings doped with Titanium had vastly improved tribological performance and mechanical properties to sputter-deposited, undoped MoS 2 coatings. The improvement in mechanical properties, load bearing capacity, and wear resistance over pure MoS 2 has been attributed to the dopant content [23][24][25]. Although the friction and wear performance of the doped MoS 2 coatings have been well-studied in unidirectional and reciprocating sliding contact, limited studies have been conducted on these coatings under rolling or mixed mode contact.…”

Section: Introductionmentioning

confidence: 99%

“…Although the friction and wear performance of the doped MoS 2 coatings have been well-studied in unidirectional and reciprocating sliding contact, limited studies have been conducted on these coatings under rolling or mixed mode contact. The first rolling contact studies involving a Ti-doped MoS 2 coating were previously published in [22,24]. The goal of this work was to achieve a better understanding of the science behind the rolling contact performance of Ti-MoS 2 -coated balls by comparing test results conducted in ambient, vacuum, and boundary-lubricated environments.…”

Section: Introductionmentioning

confidence: 99%

Rolling Contact Performance of a Ti-Containing MoS2 Coating Operating Under Ambient, Vacuum, and Oil-Lubricated Conditions

2019

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Solid lubricant molybdenum disulfide (MoS2) coatings have been frequently used to lubricate mechanisms operating in environments where oil and grease lubrication are ineffective. This work evaluated the rolling contact performance of a Titanium-containing MoS2 coating under humid ambient, vacuum, and oil-lubricated conditions. Weibull analyses of L50 lifetimes of AISI 52100 steel balls coated with a Ti-MoS2 coating paired with uncoated M50 steel rods were determined to be 3.7, 14.5, and 158.6 million cycles in ambient, vacuum, and oil-lubricated environments, respectively. In the ambient and vacuum tests, failures were determined to be associated with the onset of abrasive wear rather than fatigue or spalling. The L50 lifetimes of tests performed in those environments were found to depend upon the wear rate of the coatings on the balls. That is, the Ti-MoS2 functioned as a barrier to the onset of abrasive wear between the steel alloys until the coating was sufficiently worn away. Under oil-lubricated (boundary lubrication) conditions, L50 was found to depend on the durability and composition of tribofilms formed in-situ on the surfaces of the uncoated M50 rods. The tribofilms were comprised of mixtures of MoS2 crystallites and amorphous hydrocarbon (a-C:H). The crystalline MoS2 in the tribofilm originated from the amorphous Ti-MoS2 coating and likely underwent a thermodynamic phase transition as a result of the applied Hertz stress and frictional heating in the contact. The a-C:H in the tribofilm probably originated from a catalytic scission of the polyalphaolefin (PAO) molecules caused by the d-band character of the Mo or Ti in the coating. Overall, the Ti-MoS2-coated balls were effective at extending the operational lifetimes of M50 rods under ambient, vacuum, and oil-lubricated conditions by an order of magnitude.

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An investigation of material and tribological properties of Sb2O3/Au-doped MoS2 solid lubricant films under sliding and rolling contact in different environments

Cited by 52 publications

References 37 publications

Effects of Deposition and Annealing Temperature on the Structure and Optical Band Gap of MoS2 Films

Effects of Deposition and Annealing Temperature on the Structure and Optical Band Gap of MoS2 Films

Structure and Properties of Titanium Doped Tungsten Disulfide Thin Films Produced via the Magnetron Co-Sputtering DC Technique

Rolling Contact Performance of a Ti-Containing MoS2 Coating Operating Under Ambient, Vacuum, and Oil-Lubricated Conditions

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