Structure and tribological properties of WSex, WSex/TiN, WSex/TiCN and WSex/TiSiN coatings

Shtansky, Dmitry V.; Lobova, T. A.; Fominski, V. Yu.; Kulinich, Sergei A.; Lyasotsky, I.V.; Петржик, М. И.; Левашов, Е. А.; Moore, John J.

doi:10.1016/j.surfcoat.2003.09.047

Cited by 62 publications

(39 citation statements)

References 38 publications

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“…In tribological applications, MoSe 2 offers a lower friction coefficient compared to WS 2 and the friction coefficient is almost independent of humidity [2]. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Nanotribology of Mo–Se–C films

Tomala

Roy

Franek

2010

Philosophical Magazine

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“…It is also possible that the thick hard Ti(N) interlayer in this system provides a good mechanical support to guarantee a low contact area although a good mechanical behavior has been previously reported for similar BCN compounds deposited on Si (100) [11]. The importance of a hard underlayer has been previously pointed out to be essential for extreme low friction [31]. Finally, the monolithic TiC represents a situation with a high mechanical strength but limited lubricant properties by the deficiency of sp 2 -bonded C phase.…”

Section: Accepted M Manuscriptmentioning

confidence: 81%

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Ciarsolo

Fernández

Gopegui

et al. 2014

Surface and Coatings Technology

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The use of carbon-based coatings (hydrogenated and non-hydrogenated DLC, doped and alloyed-DLC) is of a wide interest due to its applications in mechanical components submitted to friction and wear including sliding parts in automotive engines. A tribological comparative analysis using a reciprocating (SRV) tester in lubricated and unlubricated conditions with a 4-stroke motor oil has been carried out on six currently relevant state-of-the-art coatings (namely WC/a-C, TiBC/a-C and TiC/a-C:H nanocomposites, Ti-doped DLC, BCN film and a crystalline monolithic TiC film as reference). The quantification of the fraction of the sp 2 -bonded matrix has been done by fitting of C1s XPS peak and the mechanical properties evaluated by nanoindentation. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 2The comparative analysis has allowed us to identify the capabilities of each system This fundamental information would be of relevance for assisting engineers in selecting best partnership for lubrication systems.

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“…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. 22,23 Metal selenides are less studied than sulfides although they have been also object of intense study due to their self-lubricant properties, [24][25][26][27][28][29] applications in photovoltaics 30 or ultralow thermal conductivity 31 . They have similar layered crystal structure formed by Se-W-Se platelets although with higher axial ratio of lattice parameters which facilitates relative motion between layers 32 .…”

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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Structure and tribological properties of WSex, WSex/TiN, WSex/TiCN and WSex/TiSiN coatings

Cited by 62 publications

References 38 publications

Nanotribology of Mo–Se–C films

Nanotribology of Mo–Se–C films

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Self-Lubricity of WSe_x Nanocomposite Coatings

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Structure and tribological properties of WSex, WSex/TiN, WSex/TiCN and WSex/TiSiN coatings

Cited by 62 publications

References 38 publications

Nanotribology of Mo–Se–C films

Nanotribology of Mo–Se–C films

Tribological comparison of different C-based coatings in lubricated and unlubricated conditions

Self-Lubricity of WSex Nanocomposite Coatings

Contact Info

Product

Resources

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Self-Lubricity of WSe_x Nanocomposite Coatings