Effect of Mating Material and Graphitization on Wear of a-C:H Coating in Boundary Base Oil Lubrication

Aboua, Kouami Auxence Melardot; Umehara, Noritsugu; Kousaka, Hiroyuki; Tokoroyama, Takayuki; Murashima, Motoyuki; Mustafa, Mohd Muhyiddin Bin; Mabuchi, Yutaka; Higuchi, Tsuyoshi; Kawaguchi, Masahiro

doi:10.1007/s11249-019-1248-6

Cited by 38 publications

(8 citation statements)

References 27 publications

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“…In earlier works, graphitization of DLC has been employed to explain its tribological mechanism. − The percentage of sp 2 bonded atoms in a DLC film can be used to express the degree of graphitization present because this process involves the conversion of C atoms from sp 3 to sp 2 hybrid bonds. A high level of f sp 2 indicates a higher degree of graphitization, which typically results in a lower friction force F f . − Figure shows that the percentage of sp 3 , sp 2 , and sp 1 bonded C atoms (f sp 3 , f sp 2 , and f sp 1 ) varies with different loadings of F n and the number of nitrogen molecules N n2 .…”

Section: Resultsmentioning

confidence: 99%

Probing Friction Properties of Hydrogen-Free DLC Films in a Nitrogen Environment Based on ReaxFF Molecular Dynamics

et al. 2022

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In this paper, ReaxFF molecular dynamics simulations were used to look at how load and the number of nitrogen molecules affect how friction behavior in hydrogen-free diamond-like carbon (DLC). The presence of nitrogen molecules will inhibit the formation of C–C covalent bonds between the contact surfaces of the upper and lower DLC, thereby effectively suppressing the increase in friction during the initial friction phase. After the initial friction stage, the mechanical mixing of the contact surfaces brought on by the diffusion of nitrogen molecules results in considerable shear stress, which has significant impacts on the friction force. In addition, due to the existence of nitrogen molecules, the effect of graphitization of hydrogen-free DLC on friction is almost negligible.

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Section: Resultsmentioning

confidence: 99%

Probing Friction Properties of Hydrogen-Free DLC Films in a Nitrogen Environment Based on ReaxFF Molecular Dynamics

et al. 2022

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“…At the same time, for all four friction pairs studied under testing when lubricated using pure mineral oil, sufficiently lower friction coefficients have been obtained than those obtained when lubricated using the same oil with the AW and EP additives. To all appearances, both results are obtained as a consequence of the fact that the graphitization of the thinnest surface layer of the carbon coating under sufficiently high loads and temperatures occurring in the friction contact zone is blocked by both the doping elements and the additives studied, which expands the areas of normal friction [16].…”

Section: Investigation Of Silicon-doped Dlcsmentioning

confidence: 95%

Doping Diamond-Like Carbon Coatings on Rubbing Parts as a Method for Improving Antifriction Properties of Lubricants

Buyanovskii

Levchenko

Самусенко

et al. 2021

J. Mach. Manuf. Reliab.

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The potentialities of improving the antifriction and antiwear properties of lubricants under friction in a boundary lubrication mode by means of doping carbon coatings on the contacting parts of lubricated friction units with the use of different elements of the Periodic Table are considered. The results of studies on the tribotechnical characteristics of such coatings have shown the fact that doping carbon coatings with tungsten, molybdenum, titanium, and silicon in a number of model lubricants is quite efficient.

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“…Diamond-Like Carbon (DLC) wear acceleration is assumed to be due to its structural change [26][27][28][29][30]. For example, nitrogenated amorphous carbon (a-CNx) was affected by friction or ultraviolet irradiation such that it released nitrogen atoms from the coating [31,32], and experienced oxygen atom desorption from the coating [33,34] or carbon diffusion to the mating material [35][36][37]. These changes caused graphitization of the topmost surface, which was assumed to be lower in hardness than the original surface.…”

Section: Introductionmentioning

confidence: 99%

The Tribological Property of a-C:H Coating with Tribolayer by Additive Having Glycerol and Phosphate Oxide Structure

Tokoroyama

Tanaka²,

Kani³

et al. 2022

Tribol Lett

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The tribological properties of a-C:H coating sliding against a SUJ2 ball, a SUJ2 roller, and an a-C:H coated roller were investigated under temperatures ranging from 20°C to 80°C in PAO with different additives. The additives had a glycerol and hydroxyl functional group in one molecule to enhance additive adsorption for mating with the a-C:H coating disk material and to build a phosphorus oxide tribolayer.Additives with different numbers of hydroxyl groups and primary or secondary-type C 6 H 13 O structures were also prepared. The tribolayer derived from each additive was analyzed via EDS, XPS, and ToF-SIMS. XPS depth analysis for the tribolayers revealed that additives were dissociated by friction and suggested C-O bond cleavage occurred.

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Effect of Mating Material and Graphitization on Wear of a-C:H Coating in Boundary Base Oil Lubrication

Cited by 38 publications

References 27 publications

Probing Friction Properties of Hydrogen-Free DLC Films in a Nitrogen Environment Based on ReaxFF Molecular Dynamics

Probing Friction Properties of Hydrogen-Free DLC Films in a Nitrogen Environment Based on ReaxFF Molecular Dynamics

Doping Diamond-Like Carbon Coatings on Rubbing Parts as a Method for Improving Antifriction Properties of Lubricants

The Tribological Property of a-C:H Coating with Tribolayer by Additive Having Glycerol and Phosphate Oxide Structure

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