Ultra-low friction of tetrahedral amorphous diamond-like carbon (ta-C DLC) under boundary lubrication in poly alpha-olefin (PAO) with additives

Tasdemir, Haci Abdullah; Wakayama, Masaharu; Tokoroyama, Takayuki; Kousaka, Hiroyuki; Umehara, Noritsugu; Mabuchi, Yutaka; Higuchi, Tsuyoshi

doi:10.1016/j.triboint.2013.03.014

Cited by 95 publications

(54 citation statements)

References 18 publications

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“…For the ta-C film lubricated with PAO + GMO, the friction coefficient dramatically decreased during the 0.25-0.048 s test period. It should be noted that many researchers have also reported low frictional properties of ta-C films lubricated with GMO solutions [11][12][13][14]16,[20][21][22]. On the other hand, the ID/IG ratio linearly increased from 0.67 to approximately 1.35 in the spectra of the ta-C film lubricated with PAO + GMO, which correlated with graphitization in similar way to the case of pure-PAO.…”

Section: In Situ Raman Analysis Conditionssupporting

confidence: 54%

“…Owing to the considerable amount of research, it is well-known that the tribological behavior of a DLC film depends on various factors such as atmospheric conditions [1][2][3][4][5][6], counter-materials [7][8][9], and the type of lubricant [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. In particular, the tribological behavior of a DLC film is governed by graphitization of the DLC film under dry sliding conditions [24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…An "in contact" or "in situ (in lubro)" analysis is thus needed to clarify the effects of the graphitization on the tribological properties of DLC films under lubricated conditions. Moreover, it is expected that the lubricant additives strongly influence the graphitization process of DLC films under lubricated condition because the tribological properties of DLC films under lubricated conditions is governed by lubricant additives [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…A laboratory-built in situ Raman tribometer (Raman spectrometer combined with a friction tester) was used to monitor the tribological and graphitization process of a DLC film lubricated with pure poly-alpha-olefin (PAO); PAO with an added organic friction modifier (FM), glycerol mono-oleate (GMO). In particular, a tetrahedral amorphous carbon (ta-C) film was used to representative DLC films in all of the experiments reported here since the ta-C film have exhibited more excellent tribological properties than other DLC films under boundary lubrication [11][12][13][14]16,[20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In Situ Raman Observation of the Graphitization Process of Tetrahedral Amorphous Carbon Diamond-Like Carbon under Boundary Lubrication in Poly-Alpha-Olefin with an Organic Friction Modifier

et al. 2017

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The graphitization process of a tetrahedral amorphous carbon (ta-C) film under lubrication was investigated using a laboratory-built in situ Raman tribometer. The coating was lubricated with poly-alpha-olefin (PAO), PAO with an added friction modifier (FM), glycerol mono-oleate (GMO). Friction tests were carried out using a ball-on-disk setup, in which a 19-mm diameter ta-C-coated ball was loaded and rubbed against a steel disk that was immersed in a lubricant solution. In situ optical microscopy and Raman spectroscopy were used to monitor the graphitization process and wear tracks of the ta-C-coated ball. Raman analysis was conducted on the rubbed surface of the rotating ta-C-coated ball when it was located under an objective lens every three minutes during sliding. In this study, the degree of graphitization of the ta-C surface was estimated by calculating the intensity ratio of the D-peak and G-peak (ID/IG) in the Raman spectra of the ta-C film during friction tests with different lubricants. All our results suggest that the friction modifier inhibits the progression of graphitization of DLC films by reducing friction, in other words, reducing the contact temperature, and the wear progression of DLC films under boundary lubrication can be induced by graphitization of DLC surfaces at the sliding contact.

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Section: In Situ Raman Analysis Conditionssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In Situ Raman Observation of the Graphitization Process of Tetrahedral Amorphous Carbon Diamond-Like Carbon under Boundary Lubrication in Poly-Alpha-Olefin with an Organic Friction Modifier

et al. 2017

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“…It is possible to tailor the DLC coating process to achieve, e.g., very hard coatings with high sp 3 content or low-friction coatings with high sp 2 content [5,12,13]. While the sp 3 hybridisation ensures strong bonding in all three dimensions, sp 2 hybridisation causes strong s-bonds in the plane and weak van der Waals forces perpendicular to the plane resulting in an anti-seizing agent becoming the material of choice for "lubricant" between moving parts [1,5].…”

Section: Introductionmentioning

confidence: 99%

High Energy Radial Deposition of Diamond-Like Carbon Coatings

et al. 2015

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Diamond-like carbon (DLC) coatings were deposited with a new direct ion deposition system using a novel 360 degree ion source operating at acceleration voltage between 4 and 8 kV. Cross-sectional TEM images show that the coatings have a three layered structure which originates from changes in the deposition parameters taking into account ion source condition, ion current density, deposition angles, ion sputtering and ion source movement. Varying structural growth conditions can be achieved by tailoring the deposition parameters. The coatings show good promise for industrial use due to their high hardness, low friction and excellent adhesion to the surface of the samples.

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Tribo‐Induced Structural Transformation and Lubricant Dissociation at Amorphous Carbon–Alpha Olefin Interface

Wang

Lee

2018

Advcd Theory and Sims

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Amorphous carbon (a-C) combined with a fluid lubricant is capable of providing an ultra-low friction state and thus achieving long lifetime and reliable operation. However, the understanding of the atomistic process occurring at the sliding friction interfaces, especially the interfacial structure transformation and lubricant dissociation at different contact states, is still not well understood. Here, using reactive molecular dynamics simulation, the friction behavior of a self-mated a-C system composited with different alpha olefins (AOs) as lubricants is comparatively investigated, and the results present that due to the co-existence of tribo-induced thermal and shearing effects, AOs exhibit different physicochemical behaviors at the a-C-a-C interface compared to that at the a-C surface. Although introducing AOs into a self-mated a-C system reduces the friction coefficient, its efficiency strongly relies on the AO variety and contact pressure. The pressure-driven dissociation of AOs passivates the friction interface, resulting in the evolution of the primary friction mechanism from hydrodynamic lubrication to interfacial passivation that is not accessible by experimental characterization. The corresponding scission sites of different AOs are demonstrated, which enriches the fundamental understanding on sliding friction behavior and offers a comprehensive design criterion for lubricants (viscosity, chain length, and bond saturated states) and a-C to achieve nearly frictionless sliding interface.

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Ultra-low friction of tetrahedral amorphous diamond-like carbon (ta-C DLC) under boundary lubrication in poly alpha-olefin (PAO) with additives

Cited by 95 publications

References 18 publications

In Situ Raman Observation of the Graphitization Process of Tetrahedral Amorphous Carbon Diamond-Like Carbon under Boundary Lubrication in Poly-Alpha-Olefin with an Organic Friction Modifier

In Situ Raman Observation of the Graphitization Process of Tetrahedral Amorphous Carbon Diamond-Like Carbon under Boundary Lubrication in Poly-Alpha-Olefin with an Organic Friction Modifier

High Energy Radial Deposition of Diamond-Like Carbon Coatings

Tribo‐Induced Structural Transformation and Lubricant Dissociation at Amorphous Carbon–Alpha Olefin Interface

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