Friction and wear characteristics of DLC coatings with different hydrogen content lubricated with several Mo-containing compounds and their related compounds

Masuko, Masabumi; Ono, Tomoshige; Aoki, Saiko; Suzuki, Akihito; Ito, Hirotaka

doi:10.1016/j.triboint.2014.04.037

Cited by 35 publications

(21 citation statements)

References 21 publications

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“…Interestingly it only occurs with DLC/steel rubbing pairs and not DLC/DLC ones [165]. Fortunately this high wear can be suppressed, at least to some extent, by the presence of antiwear additives [164] and appears to be less pronounced for other organomolybdenum additives compared to MoDTC [167].…”

Section: Research On Oil-soluble Molybdenum Fmsmentioning

confidence: 95%

“…AFM has shown the formation of tiny low friction regions just as seen with MoDTC on steel [162] while TEM has also revealed the characteristic nanosheets of MoS 2 previously seen with steel-steel contacts [161]. Unfortunately MoDTC also appears to promote very high wear of most types of DLC coatings [163][164][165][166][167]. The mechanism of this harmful effect is not yet clear and has been variously attributed to MoO 3 promoting the oxidation of DLC [163], abrasion of the DLC by MoO 3 particles [166] or wear via graphitization of the DLC surface [165].…”

Section: Research On Oil-soluble Molybdenum Fmsmentioning

confidence: 99%

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Friction Modifier Additives

2015

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The need for energy efficiency is leading to the growing use of additives that reduce friction in thin film boundary and mixed lubrication conditions. Several classes of such friction modifier additive exist, the main ones being organic friction modifiers, functionalised polymers, soluble organo-molybdenum additives and dispersed nanoparticles. All work in different ways. This paper reviews these four main types of lubricant friction modifier additive and outlines their history, research and the mechanisms by which they are currently believed to function. Aspects of their behaviour that are still not yet fully understood are highlighted.

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Section: Research On Oil-soluble Molybdenum Fmsmentioning

confidence: 95%

Section: Research On Oil-soluble Molybdenum Fmsmentioning

confidence: 99%

Friction Modifier Additives

2015

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“…This can cause significant wear of hydrogenated DLC [10,11]. On the other hand, a hydrogen-free DLC shows no significant wear in the presence of MoDTC [10,13]. However, it does not present sufficient lubrication with MoDTC-containing oil [14], suggesting appropriate lubricant or additive is necessary for favorable lubrication of hydrogen-free DLCs [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…However, the reduction of MoO3 does not necessarily correspond to the wear amount of the DLC coating by one-to-one [10,13], and effect of carbon bond structure of DLC coatings has not been made abundantly clear. In this research, we investigated friction and wear behavior of DLCs from the further intrinsic viewpoint of carbon bond structure of DLCs involving tribo-chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC

Komori

Umehara

2017

Tribology Online

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In this study, we investigated tribological properties of "tetrahedral" Si-containing hydrogenated DLC coating (TMS coating) during sliding against steel or cast-iron lubricated with engine-oil containing MoDTC and ZnDTP additives. TMS coatings derived from only tetramethylsilane were prepared using PACVD with high-bias process. TMS coating had the highly carbon sp 3 bonded structure induced by Si (over 20 at.%) with high hydrogen content (30 at.%). TOF-SIMS analysis showed that TMS coating could form the additive-derived tribofilm on both of the non-ferrous coating surface and the ferrous counter surface to promote Mo-sulfide formation effectively, leading a low friction coefficient. The tribo-chemical reactions were related not only to Mo-sulfides formation, but also reduction of Mo-oxides. Mo-oxides could react with DLC material and induce hydrogen evolution and transformation into further weak carbon structure, causing an increasing wear of hydrogenated DLCs. TMS coating showed no significant wear in spite of plenty hydrogen content. Si induced sp 3 bond and could act so as not to induce clustering of the sp 2 phase. This could inhibit increasing wear of the DLC in the presence of MoDTC. The effectiveness of TMS coating in friction and wear behavior was shown to depend on tribo-chemical reactions and transformation of carbon bond structure.

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“…Diamond-like Carbon (DLC) films, a kind of fascinating materials, having some features of both graphite and diamond, such as high hardness, good wear resistance, low friction coefficient, chemical inertness and biocompatibility, which have been extensively used in many fields due to its excellent properties [1][2][3][4]. However, high residual compressive stress and weak adhesion of DLC films to substrate has restricted their working life and applications [5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Deep Cryogenic Pre-treatment for Substrates on Mechanical Property of DLC Films

Gong¹,

Nie

Jin

et al. 2016

Proceedings of the 2016 2nd International Conference on Advances in Energy, Environment and Chemical Engineering (AEECE 2016)

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2µm thick DLC multilayer films were deposited on W9 high-speed steel with deep cryogenic pre-treatment (DCT) for 30 hours in liquid nitrogen by unbalanced magnetron sputtering technique, which were compared with the DLC films without DCT. The results show that compound systems with DCT exhibit higher film-substrate bonding strength and superior friction wear property, which are closely related to the DCT effect that martensitic transformation and decomposition, grain refinement and carbides precipitation. Thus the hardness, strength and residual stress of substrate are improved remarkably, and deformation compatibility between film and substrate under external load become more coordinating. Meanwhile, surface morphology of substrate is effectively adjusted by phase transformation, as a result, element diffusion and mechanical interlocking effect of film-substrate interface are optimized with added grain boundary and fine uniform organization. IntroductionDiamond-like Carbon (DLC) films, a kind of fascinating materials, having some features of both graphite and diamond, such as high hardness, good wear resistance, low friction coefficient, chemical inertness and biocompatibility, which have been extensively used in many fields due to its excellent properties [1][2][3][4]. However, high residual compressive stress and weak adhesion of DLC films to substrate has restricted their working life and applications [5][6]. To reduce the residual stress and to enhance the adhesion and mechanical properties of DLC films, a lot of techniques have been studied by researchers [7][8][9][10][11], such as changing sedimentary means, doping third elements (N, Cr, Ti, W, etc), incorporating metal transition layer. Nonetheless, previous studies have their own limitations because these ways focus primarily on changing the properties of films.Deep cryogenic treatment is a special kind of heat treatment technology, and has been efficiently performed on metal materials since 1940. Samples are cooled down in liquid nitrogen for some periods, then gradually warmed up to room temperature, which is used regularly after quenching and before tempering. A lot of studies suggest that DCT allows the occurrence of phase transition and microstructure refinement, it can significantly improve some properties of metal substrate [12][13][14]. From previous studies, we believe that the hardness, strength and surface state of metallic substrates are equally important for bonding strength and properties of films [15][16]. In this paper, deep cryogenic treatment was used to improve the properties of metallic substrates. we mainly investigated the mechanical property of DLC films from film-substrate bonding strength and friction performance. Moreover, the effect of DCT on microstructure and surface state of substrates were significantly discussed as well as the optimization mechanism of film-substrate interface.

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Friction and wear characteristics of DLC coatings with different hydrogen content lubricated with several Mo-containing compounds and their related compounds

Cited by 35 publications

References 21 publications

Friction Modifier Additives

Friction Modifier Additives

Friction and Wear Properties of Tetrahedral Si-Containing Hydrogenated Diamond-Like Carbon Coating under Lubricated Condition with Engine-Oil Containing ZnDTP and MoDTC

Effect of Deep Cryogenic Pre-treatment for Substrates on Mechanical Property of DLC Films

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