Friction-induced structural transformations of diamondlike carbon coatings under various atmospheres

Sánchez-López, J.C.; Erdemir, Ali; Donnet, C.; Rojas, T.C.

doi:10.1016/s0257-8972(02)00641-2

Cited by 219 publications

(144 citation statements)

References 19 publications

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“…Having a graphite-like structure through transferring worn materials from the a-C:15H coating to the interface could significantly reduce friction in dry conditions [13][14][15]. Graphitisation could be initiated by high temperature (400 o C) causing the hydrogen to be diffused out of the a-C:15H matrix which in return results in collapse of the random covalent structure of a-C:15H and provide a graphitic layer.…”

Section: Effect Of Oil Chemistry On Coating Delaminationmentioning

confidence: 99%

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Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Kosarieh

Morina

Lainé

et al. 2013

Surface and Coatings Technology

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Abstract:Diamond-like carbon (DLC) coatings show extremely good promise for a number of applications in automotive components as they exhibit excellent tribological properties such as low friction and good wear resistance. This can impact on improved fuel economy and durability of the engine components. Much work has been reported on the dry sliding of DLC coatings with less so in lubricated contacts and, as such, there is a need to further understand the tribochemistry of lubricated DLC contacts. Commercially-available oils are normally optimized to work on ferrous surfaces. Previous studies on DLC lubricated contacts have tended to use model oil systems rather than fully formulated lubricants and from this an interesting picture of lubrication mechanisms is emerging. Optimising compatibility between a surface and a set of lubricant additives may lead to excellent durability (wear) as well as increased fuel economy (low friction). In this work, the friction and wear properties of a DLC coating under boundary lubrication conditions have been investigated and the tribological performance compared with that of an uncoated steel system. A pin-on-plate tribotester was used to run the experiments using High speed steel (HSS) M2 grade plates coated with 15 at.% hydrogenated DLC (a-C:15H) sliding against cast iron pins. A Group III mineral base oil, fully synthetic Group IV PAO and four different fully formulated oils were used in this study. Furthermore optical and scanning electron microscopes (SEM) were used to observe the wear scar and to assess the durability of the coatings. Energy-Dispersive X-ray analysis (EDX), X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy analyses were performed on the tribofilms to understand the tribochemical interactions between oil additives and the a-C:15H coating.This study show that the durability of the a-C:15H coating strongly depends on the selected additive package in the oils. In addition the effect of detergent, dispersant and antioxidants on the performance of the Molybdenum-based friction modifier (Mo-FM) and ZDDP anti-wear additive were investigated and results are reported in this paper.

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Section: Effect Of Oil Chemistry On Coating Delaminationmentioning

confidence: 99%

“…The graphitisation of DLC plays an important role in friction reduction under dry sliding conditions [13][14][15]. Under tribological conditions, usually, the softer of the two materials will be worn while this is not the case for DLC.…”

Section: Introductionmentioning

confidence: 99%

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Kosarieh

Morina

Lainé

et al. 2013

Surface and Coatings Technology

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“…In spite of the outstanding properties of DLC coatings, the CoF and wear mechanisms depend significantly on the deposition method/parameters [1,5], variation in environment, either in vacuum or room atmosphere [6], relative humidity [7], the substrate and counterbody materials, the various coating architectures such as multiple or gradient layers, and very importantly, the wearing conditions, i.e. under dry, water, oil or a combination of these [8,9].…”

Section: Introductionmentioning

confidence: 99%

Tribological performance of an H-DLC coating prepared by PECVD

Solís

Zhao

Wang

et al. 2016

Applied Surface Science

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and 5.5 x 10 -8 mm -3 /N m, respectively. Through Raman spectroscopy and electron microscopy it was confirmed the carbon-carbon contact, due to the tribolayer formation on the wear scars of the coating and pin. In order to further corroborate the experimental observations regarding the graphitisation behaviour, the existing mathematical relationships to determine the graphitisation temperature of the coating/steel contact as well as the flash temperature were used.

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“…On the other hand, the characterization and analysis of tribofilm provides fingerprint information for the origin of wear product and its interactions with environment species. In recent years, many sophisticated surface analysis techniques have been applied in worn surface and tribofilm analysis [1][2][3][4][5][6][7][8][9][10]. Among these techniques, transmission electron microscopy (TEM) is known to have the best spatial resolution for imaging and the multiple capabilities of chemical and structural analyses.…”

Section: Introductionmentioning

confidence: 99%

TEM-EELS study of low-friction superlattice TiAlN/VN coating: the wear mechanisms

et al. 2006

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A 20-50 nm thick tribofilm was generated on the worn surface of a multilayer coating TiAlN/VN after dry sliding test against an alumina counterpart. The tribofilm was characterized by applying analytical transmission electron microscopy techniques with emphasis on detailed electron energy loss spectrometry and energy loss near edge structure analysis. Pronounced oxygen in the tribofilm indicated a predominant tribo-oxidation wear. Structural changes in the inner-shell ionization edges of N, Ti and V suggested decomposition of nitride fragments.

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Friction-induced structural transformations of diamondlike carbon coatings under various atmospheres

Cited by 219 publications

References 19 publications

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Tribological performance of an H-DLC coating prepared by PECVD

TEM-EELS study of low-friction superlattice TiAlN/VN coating: the wear mechanisms

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