Ultralow friction of DLC in presence of glycerol mono-oleate (GNO)

Kano, Makoto; Yasuda, Yoshiteru; Okamoto, Yasumasa; Mabuchi, Yutaka; Hamada, Toru; Ueno, Takafumi; Ye, J.; Konishi, Shozaburo; Takeshima, Shigeki; Martin, Jean Michel; Bouchet, Maria Isabel De Barros; Mognee, T. Le

doi:10.1007/s11249-004-2749-4

Cited by 218 publications

(174 citation statements)

References 20 publications

(22 reference statements)

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“…15 The percentage of sp 3 sites in the ta-C coating is 90% as calculated from x-ray appearance near-edge structure experiments. 17 This result is consistent with the high values measured by nanoindentation for hardness ͑ϳ65 GPa͒ and Young modulus ͑650 GPa͒. 17 In addition, secondary ion mass spectroscopy ͑SIMS͒ profiling experiments detected no hydrogen in the bulk of the ta-C coating.…”

Section: Experimental Partsupporting

confidence: 78%

“…17 This result is consistent with the high values measured by nanoindentation for hardness ͑ϳ65 GPa͒ and Young modulus ͑650 GPa͒. 17 In addition, secondary ion mass spectroscopy ͑SIMS͒ profiling experiments detected no hydrogen in the bulk of the ta-C coating. 3,17 Thus, the carbon coating mostly corresponds to "amorphouslike diamond" or tetrahedral amorphous carbon ͑or ta-C͒, in the carbonhydrogen phase diagram terminology of Robertson.…”

Section: Experimental Partsupporting

confidence: 78%

“…As a result, a very thin and low-shear-strength tribofilm is formed on the ta-C sliding surface. 15,17,22 It appears that superlubricity is directly related to the trialcohol chemical functions ͑ −OH͒ of the glycerol molecule. However, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Superlubricity and tribochemistry of polyhydric alcohols

et al. 2008

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The anomalous low friction of diamondlike carbon coated surfaces lubricated by pure glycerol was observed at 80°C. Steel surfaces were coated with an ultrahard 1 µm thick hydrogen-free tetrahedral coordinated carbon ͑ta-C͒ layer produced by physical vapor deposition. In the presence of glycerol, the friction coefficient is below 0.01 at steady state, corresponding to the so-called superlubricity regime ͑when sliding is then approaching pure rolling͒. This new mechanism of superlow friction is attributed to easy glide on triboformed OHterminated surfaces. In addition to the formation of OH-terminated surfaces but at a lower temperature, we show here some evidence, by coupling experimental and computer simulations, that superlow friction of polyhydric alcohols could also be associated with triboinduced degradation of glycerol, producing a nanometer-thick film containing organic acids and water. Second, we show outstanding superlubricity of steel surfaces directly lubricated by a solution of myo-inositol ͑also called vitamin Bh͒ in glycerol at ambient temperature ͑25°C͒. For the first time, under boundary lubrication at high contact pressure, friction of steel is below 0.01 in the absence of any long chain polar molecules. The mechanism is still unknown but could be associated with friction-induced dissociation of glycerol and interaction of waterlike species with steel surface.

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Section: Experimental Partsupporting

confidence: 78%

Section: Experimental Partsupporting

confidence: 78%

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Superlubricity and tribochemistry of polyhydric alcohols

et al. 2008

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“…DLCs have been touted for their low friction and wear-resistant properties in boundary/mixed lubrication. Friction coefficients as low as 0.006 have been reported in additivated oils [25]. However, due to vast DLC surface finishes available, these results are not general.…”

Section: Introductionmentioning

confidence: 95%

Development of valve train rig for assessment of cam/follower tribochemistry

Ofune

Banks

Morina

et al. 2016

Tribology International

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Component bench tests are a crucial part of a tribology assessment experimental programme for most engines and subsystems. This is because they test the components under conditions simulating the operating characteristics of the system. These have become very important as they shed more light into the friction, wear, lubrication and importantly for this study, the tribochemistry of valve train systems. This work outlines the procedure for the development of a single cam rig (SCR) from a 1.25L FORD Zetec (SE) engine. Friction plots were used to validate the data obtained from the newly developed single cam rig with Mn-phosphate coated and polished follower against a cast iron camshaft. The tribofilm formed using normal and mid Sulphated Ash, Phosphorus and Sulphur (SAPS) 5W-30 oils were evaluated and correlated to the friction and wear properties of the tribopair.Raman and FIB-SEM/EDX investigations of the tribochemical films showed that the normal SAPS oil produced patchy, thick (80-100 nm) and well dispersed tribofilm with better wear prevention capabilities. It was observed that Mid SAPS oil had lower wear prevention due to loosely dispersed and thin tribofilms. Absence of tribofilms at the centre of the insert with this oil also suggests that formation and removal processes are an integral part of the wear mechanisms in highly loaded cam follower systems.

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“…Although the applications of the amorphous carbon film have been increased recently to reduce friction for the sliding parts in the automotive engine [1][2][3][4][5] and to improve the oxygen barrier property of the poly(ethylene terephthalate) (PET) bottle for the soft drink, 6,7) there are several technical issues to be improved, as shown in Table I. The optimum material combination of diamond-like carbon (DLC) coating with the environment friendly lubricant to reduce friction markedly is required to be found in near future to improve the environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Low Friction Property of Diamond-Like Carbon Coating Films and Oxygen Transmission Ratio of Amorphous Carbon Films Deposited by Advanced Coating Processes

Watanabe¹,

Kano²,

Yoshida³

et al. 2012

Jpn. J. Appl. Phys.

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The topics of the applied technology of amorphous carbon film to reduce friction using diamond-like carbon (DLC) coated by the vacuum arc ion plating process and to improve the gas barrier property using the amorphous carbon film by the atmospheric pressure plasma process are introduced with the basic experimental results. For reducing friction, the super low friction coefficient below 0.01 has been found when the tetrahedral amorphous carbon coating deposited by T-shape filtered arc deposition method [ta-C(T)] was evaluated the friction property under oleic acid lubrication at pure sliding condition. It was thought that the low share strength tribofilm composed of water and oleic acid mono-layer seemed to be formed on the sliding interface. For gas barrier performance, the amorphous carbon film deposited by the atmospheric pressure plasma chemical vapour deposition (CVD) technique on poly(ethylene terephthalate) (PET) substrate was improved the oxygen transmission ratio (OTR) around 30% compared with that of uncoated PET substrate. These advanced performance obtained by the optimum material combination of DLC with lubricant and the original atmospheric pressure plasma CVD technique are expected to be applied on the actual application for the different types of the industrial fields in near future. #

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Ultralow friction of DLC in presence of glycerol mono-oleate (GNO)

Cited by 218 publications

References 20 publications

Superlubricity and tribochemistry of polyhydric alcohols

Superlubricity and tribochemistry of polyhydric alcohols

Development of valve train rig for assessment of cam/follower tribochemistry

Low Friction Property of Diamond-Like Carbon Coating Films and Oxygen Transmission Ratio of Amorphous Carbon Films Deposited by Advanced Coating Processes

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