Pulsed laser deposition of antifriction thin-film MoSex coatings at the different vacuum conditions

Fominski, V. Yu.; Романов, Р. И.; Gusarov, A.V.; Célis, Jean-Pierre

doi:10.1016/j.surfcoat.2007.03.006

Cited by 34 publications

(19 citation statements)

References 26 publications

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“…The buffer gas, in particular, the argon pumped into the deposition chamber enables to raise the chalcogen concentration in the DTM coating by reducing the energy of the deposited flux [10]. The tentative study [11] that it may improve the antifriction properties of coat ings by reducing the coefficient of friction. It is estab lished in [11] that the buffer gas ensures growth of coatings with the laminar structure, which has basic planes predominantly oriented parallel to the substrate surface.…”

Section: Introductionmentioning

confidence: 92%

Structural modification and tribological behavior improvement of solid lubricating WSe x coatings during pulsed laser deposition in buffer He-Gas

et al. 2013

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Thin film, solid lubricating WSe x coatings were deposited at room temperature on a steel substrate with a titanium underlayer by pulsed laser deposition (PLD). Two modes of PLD were investigated, i.e., the PLD under vacuum conditions and the PLD in a buffer gas (helium) at a pressure of 2-10 Pa. Gas was used to slow down the laser induced atomic flux and to modify thus the conditions of the coatings growth. At a pressure ~8 Pa, gas reduced the effectiveness of Se preferential sputtering by atomic flux, which resulted in the formation of coatings with a stoichiometric composition (x ≈ 2). The structure of the coatings was char acterized by a greater degree of the perfect organization of atoms in the nanophase laminar packaging and reduced internal stresses. Studies by the ball on disk tests in humid air showed that the modification of the structure and the chemical composition of the coatings had a significant effect on their tribological behavior. Vacuum deposited coatings fractured relatively quickly due to the cracking and delamination from the sub strate surface along the sliding track. When the coatings deposited in helium were tested, wear by layer by layer removal was dominant, so the adhesive fracture was only observed in the local parts of the track. The simulation of the laser vapor deposition in the vacuum and in the buffer gas was performed. Likely factors that improve the tribological properties of the coating during deposition in the buffer gas were disclosed.

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Section: Introductionmentioning

confidence: 92%

Structural modification and tribological behavior improvement of solid lubricating WSe x coatings during pulsed laser deposition in buffer He-Gas

et al. 2013

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“…MoSe 2 is more resistant to oxidation in humid ambient conditions than molybdenum sulfide [3]. Although, a variety of films are deposited by several techniques [4][5][6][7][8][9], deposition by magnetron sputtering has become increasingly popular. In this method, the deposition parameters can be empirically optimised by changing discharge power, gas pressure, position of the substrate relative to the sputtered target, bias voltage and substrate temperature [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In this method, the deposition parameters can be empirically optimised by changing discharge power, gas pressure, position of the substrate relative to the sputtered target, bias voltage and substrate temperature [10][11][12][13]. Comparing molybdenum disulfides and diselenides, the metal to chalcogen mass ratio is closer to 1 in the latter case [4], and this limits the re-sputtering of selenium from the coating. Therefore, a higher chalcogen-metal ratio compared to sputtered Mo-S could be expected.…”

Section: Introductionmentioning

confidence: 99%

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Nanotribology of Mo–Se–C films

Tomala

Roy

Franek

2010

Philosophical Magazine

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Transition metal dichalcogenides with a layered structure are well known for their self-lubricating properties, particularly in a vacuum or dry atmosphere. The macrotribological properties of these films have been studied extensively. However, the tribological behaviour of these films in the nanonewton load range has hardly been reported. Study of tribological properties with load in the nanonewton range is required for applications related to microelectromechanical systems or nanoelectromechanical systems. In view of the above, the hardness, surface force, friction force, etc. of Mo-Se-C films were investigated at an applied load in the nanonewton range using a nanoindenter and atomic force microscopy. The effect of carbon content, applied load and scanning speed on the friction coefficient was determined. Data pertaining to topography, lateral force and pull-off force of various surfaces are illustrated. The observed nanotribological behaviour of these films is analysed in the light of their nanohardness. The results indicate that the friction force of all the films is very low and in general dependent on surface force. However, a film having the highest carbon content exhibits the maximum friction force. With increasing carbon content of the films tested, the hardness increases and wear decreases. The above results pertain to investigations under ambient conditions.

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“…Weak bombardment is necessary for activating the basal plane surface, which is inert at a quality (defect free) atomic packing. The optimum bombardment condi tions can also be implemented at PLD in a buffer gas at a certain pressure [13].…”

Section: Pld In a Standard Configurationmentioning

confidence: 99%

Control of structure of WSe x /C nanocoatings synthesized via pulsed laser deposition

Grigoriev

Fominski

Nevolin

et al. 2015

Inorg. Mater. Appl. Res.

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The requirements are formulated for a new type of nanomaterials based on transition metal dichalcogenides (TMD), which are promising to create relatively cheap and effective catalysts for electro chemical hydrogen evolution reaction. The possibility of implementation of some important requirements for the structure of these materials is investigated by the example of thin film coatings containing tungsten dise lenide and carbon. WSe x /C coatings are prepared via pulsed laser deposition in an inert and reactive (CH 4 ) gas in a standard configuration and using an antidroplet screen. In some cases, low DC voltage or pulsed high voltage bias are applied to the substrate, initiating ion bombardment of the coatings. Factors exerting an important influence on the chemical composition, morphology, and surface topography of the coatings are established. Modes of formation of a rough coating surface with a high density of WSe 2 edges are determined, which is essential for high catalytic activity and performance of TMD containing nanocatalysts. The carbon phase with a high concentration of sp 2 bonds is needed for effective current transport in the formed layers.

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Pulsed laser deposition of antifriction thin-film MoSex coatings at the different vacuum conditions

Cited by 34 publications

References 26 publications

Structural modification and tribological behavior improvement of solid lubricating WSe x coatings during pulsed laser deposition in buffer He-Gas

Structural modification and tribological behavior improvement of solid lubricating WSe x coatings during pulsed laser deposition in buffer He-Gas

Nanotribology of Mo–Se–C films

Control of structure of WSe x /C nanocoatings synthesized via pulsed laser deposition

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