Chromium-modified a-C films with advanced structural, mechanical and corrosive-resistant characteristics

Ming, Miao Yi; Jiang, Xiaohong; Piliptsou, D.G.; Zhuang, Yuzhao; Рогачев, А. А.; Руденков, А.С.; Balmakou, A.

doi:10.1016/j.apsusc.2016.04.112

Cited by 27 publications

(5 citation statements)

References 51 publications

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“…Numerous research endeavors have explored the incorporation of diverse metallic elements into DLC films, aiming to elevate their attributes and primarily rectify certain undesirable characteristics achieving beyond the already commendable tribological and mechanical capabilities exhibited by DLC coatings [9]. Commonly, properties of diamondlike carbon films are modified using two primary groups of alloying materials: noncarbide formers (such as copper and silver) and carbide formers (e.g., titanium, chromium, tungsten) [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of 1-Ethyl-3-methylimidazolium Diethylphosphate Ionic Liquid on the Performance of Eu- and Gd-Doped Diamond-like Carbon Coatings

Sadeghi,

Omiya,

Fernandes

et al. 2024

Lubricants

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A composite lubricating system that combines solid and liquid lubrication can create a synergistic effect by leveraging the strengths of both types of lubricants. Solid lubrication coatings possess advantageous load-bearing abilities and exhibit low volatility. By adopting this approach, the system retains the merits of solid lubrication while simultaneously harnessing the advantages of liquid lubrication. The unique properties of diamond-like carbon coatings (DLCs) offer the potential to create binding locations for lubricant additives by introducing dopant elements that have a high affinity with additives. In the present work, the combined use of europium-doped diamond-like carbon (Eu-doped DLC) with varying atomic concentrations of the dopant element (1.7 at. % and 2.4 at. %) and gadolinium-doped diamond-like carbon (Gd-doped DLC) with different atomic concentrations of the dopant element (1.7 at. % and 2.3 at. %) was studied alongside a pure DLC coating and the incorporation of an ionic liquid (IL) additive in a tribological block-on-ring system. The focus was on the 1-Ethyl-3-methylimidazolium diethylphosphate ionic liquid with a concentration of 1 wt. % in polyalphaolefin (PAO) 8. Among the investigated pairs, the coefficient of friction (CoF) of 1.7 at. % Eu-doped DLC coupled with the IL was the smallest in boundary, mixed, and elastohydrodynamic lubrication regimes. Quantification of wear was challenging due to minimal and localized wear on the DLC coating surfaces. The decrease in friction within the boundary lubrication regime underscores the promise of mechanical systems that integrate 1.7 atomic percent Europium-doped diamond-like carbon coatings with ionic liquids (IL). This study presents a compelling avenue for future scholarly exploration and research efforts focused on reducing friction and improving the efficiency of moving components, particularly in situations where tribological properties exert a substantial influence

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Section: Introductionmentioning

confidence: 99%

Influence of 1-Ethyl-3-methylimidazolium Diethylphosphate Ionic Liquid on the Performance of Eu- and Gd-Doped Diamond-like Carbon Coatings

Sadeghi,

Omiya,

Fernandes

et al. 2024

Lubricants

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show abstract

“…Several research projects have investigated the doping of DLC films with various metallic elements to further enhance their qualities and, primarily, to adjust some undesired traits, even beyond the good mechanical and tribological capabilities of currently available DLC coatings [4]. Usually, two categories of alloying materials are used to adjust the characteristics of DLC coatings: carbides (for instance, Ti, Cr, F, and W) and non-carbide formers (for example, Cu and Ag) [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Doped DLC Coatings in the Presence of Ionic Liquid Additive under Different Lubrication Regimes

et al. 2023

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Diamond-like carbon (DLC) coatings are widely used in industries that require high durability and wear resistance, and low friction. The unique characteristics of DLC coatings allow for the possibility of creating adsorption sites for lubricant additives through the doping process. In this study, the combined use of europium-doped diamond-like carbon (Eu-DLC), gadolinium-doped diamond-like carbon (Gd-DLC), and pure DLC coatings and an ionic liquid (IL) additive, namely, trihexyltetradecylphosphonium bis (2-ethylhexyl) phosphate [P66614] [DEHP], with a 1 wt.% concentration in polyalphaolefin (PAO) 8 as a base lubricant was investigated. Higher hardness, higher thin-film adhesion, a higher ratio of hardness to elastic modulus, and a higher plastic deformation resistance factor were achieved with the Gd-DLC coating. The CoF of the Gd-DLC coating paired with the IL was superior compared to the other pairs in all lubrication regimes, and the pure DLC coating had a better performance than the Eu-DLC coating. The wear could not be quantified due to the low wear on the surface of the DLC coatings. The friction reduction demonstrates that tribological systems combining Gd-DLC thin films with an IL can be a potential candidate for future research and development efforts to reduce friction and increase the efficiency of moving parts in internal combustion engines, for instance.

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“…Many studies have been conducted on the interaction between base oils, lubricant additives, and doped DLC coatings over the past 30 years, but there is no consensus yet, moreover there is little to no research on the interaction of doped DLC and ionic liquids [57][58][59][60][61][62]. To overcome this limitation, doping with metals such as tungsten, zirconium, titanium, chromium, and silver has been done and it is successful in improving their thermal stability, corrosion resistance, and adhesion to the substrate, but the coefficient of friction still remains comparatively high [63][64][65][66][67][68][69][70][71]. Additionally, the lubrication mechanism and performance of new additives, developed to improve energy efficiency in moving mechanical components, when used with DLC films, are still un-known.…”

Section: Introductionmentioning

confidence: 99%

Impact of Temperature Variation on Friction Behaviour of Rare Earth-Doped Diamond-like Carbon Coatings with Ionic Liquid Lubricants

et al. 2023

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This research paper investigates the tribological performance of diamond-like carbon (DLC) coatings doped with rare earth metals (europium and gadolinium) as well as pure DLC lubricated with ionic liquid additives (trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate {[P66614][DEHP]} and 1-ethyl-3-methylimidazolium diethyl phosphate {[EMIM][DEP]}) in Polyalphaolefin 8 (PAO8). The study aims to examine the effect of temperature on the interaction between the coatings and additives by conducting tribological experiments using a block-on-disk setup at temperatures of 60 °C, 80 °C, and 100 °C. The primary objective is to evaluate the performance of doped DLC coatings compared to pure DLC coatings with ionic liquid additives in the lubricant in boundary lubrication conditions at various high working temperature environments. The experiments reveal that doped DLC coatings with ionic liquid additives exhibit superior tribological performance compared to pure DLC coatings. The rare earth metal dopants play a positive role in the formation of a tribofilm on the surface of the coatings as it interacts with ionic liquids, resulting in a lower coefficient of friction (CoF). Temperature influences the performance of the coatings and additives. The CoF increases with temperature for pure DLC coatings, while for doped DLC coatings it was significantly less. These findings highlight the influence of temperature on the tribological behavior of DLC coatings. Overall, this study contributes valuable insights into the impact of rare earth metal dopants and ionic liquid additives on the tribological performance of DLC coatings under different temperature conditions. The results demonstrate the potential of utilizing doped DLC coatings with ionic liquid additives as an effective approach to enhance the performance of mechanical systems.

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Chromium-modified a-C films with advanced structural, mechanical and corrosive-resistant characteristics

Cited by 27 publications

References 51 publications

Influence of 1-Ethyl-3-methylimidazolium Diethylphosphate Ionic Liquid on the Performance of Eu- and Gd-Doped Diamond-like Carbon Coatings

Influence of 1-Ethyl-3-methylimidazolium Diethylphosphate Ionic Liquid on the Performance of Eu- and Gd-Doped Diamond-like Carbon Coatings

Tribological Behavior of Doped DLC Coatings in the Presence of Ionic Liquid Additive under Different Lubrication Regimes

Impact of Temperature Variation on Friction Behaviour of Rare Earth-Doped Diamond-like Carbon Coatings with Ionic Liquid Lubricants

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