Effect of Carbon Diffusion on Friction and Wear Behaviors of Diamond-Like Carbon Coating Against Cr-Plating in Boundary Base Oil Lubrication

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

doi:10.2474/trol.13.290

Cited by 28 publications

(4 citation statements)

References 11 publications

(13 reference statements)

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“…Application of DLC coatings for automotive components is considered as a promising strategy to cope with the emerging requirements regarding fuel economy and durability [3][4][5][6][7][8][9]. DLC coatings are mainly divided into three types; tetrahedral amorphous carbon (ta-C) coating [10][11][12][13][14][15][16], hydrogenated amorphous carbon (a-C:H) coating [17][18][19], and others [20][21][22][23][24][25]. Those were subjected to friction by authors.…”

Section: Introductionmentioning

confidence: 99%

The ta-C Hardness Effect on Wear Properties Under MoDTC Contained Boundary Lubrication

Tokoroyama,

Wang,

Umehara

et al. 2023

Tribol Lett

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The wear acceleration of hydrogenated amorphous carbon under lubrication with molybdenum dithiocarbamate (MoDTC) is one of the problems to apply it to engine components. It is assumed that using high hardness tetrahedral amorphous carbon (ta-C) can easily solve the wear problem regardless of chemical wear by Mo degradable materials, however, we still do not know the effect of ta-C coating hardness on wear of itself with MoDTC. Because, amount and structure of Mo degradable material is assumed to relate contact pressure. It suggested that even if ta-C coating has high hardness, the wear amount changes with normal load. In this study, we prepared four different hardness ta-C coatings (such as approximately 18.2, 22.1, 46.6, and 53.6 GPa) and conducted friction tests to clarify the effect of ta-C hardness on wear characteristics under boundary lubrication with MoDTC. Eventually, chemical analysis (Raman, EDS and XPS) was conducted to reveal the chemical spices existence of tribo lm for three hardness ta-Cs, especially for 22.1 GPa as a representative low hardness ta-C coating. As a result, the wear suppression was achieved when the contact pressure was higher than 200 MPa regardless of the coating hardness.

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Section: Introductionmentioning

confidence: 99%

The ta-C Hardness Effect on Wear Properties Under MoDTC Contained Boundary Lubrication

Tokoroyama,

Wang,

Umehara

et al. 2023

Tribol Lett

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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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“…Especially, diamond-like carbon (DLC) is a unique coating that transforms nature of the structure due to temperature and frictional stimuli [5][6][7][8]. The DLC coatings actively interact with mating materials, resulting in different tribological behavior due to various chemical affinity to carbon atoms [9,10]. Temperature affects both surface morphologies of the DLC coatings [11,12] and their tribological properties [13,14].…”

Section: Introductionmentioning

confidence: 99%

Realization of a Novel Morphing Surface Using Additive Manufacturing and Its Active Control in Friction

Murashima

Imaizumi

Kawaguchi

et al. 2021

Journal of Tribology

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As the need for higher efficiency of engineering components increases, so does the demand for functional surfaces. While various tribosurfaces (e.g., texturing and coatings) have been developed, many researches are aimed at static functionality. On the other hand, due to a wide range of environmental adaptability and active control, active-morphing surfaces can be highly efficient and robust. In this paper, we demonstrate a novel morphing surface and its realization using additive manufacturing (AM). By using a diaphragm structure, morphing performance is achieved even if a hard resin material is used. When air pressure is applied to the backside of the diaphragm, it changes to a convex shape, and vice versa. The concept requires a complex structure for arranging airflow and a solid morphing system. The AM is one great technique to create such complex structure. As a result of actual manufacturing, the created morphing structure realizes a large morphing of 600 µm or more. In addition, the shape changes reversibly depending on the air pressure. The surface also exhibits very interesting tribological characteristics. The surface shows a friction coefficient of 0.5-1.7 with a convexity, and then decreases to about 0.3 with a concavity. A real-contact area measurement reveals that the novel property occurs due to change in the real-contact area depending on surface morphology. In conclusion, the present paper provides a new concept of a novel morphing tribosurface, which selectively performs as a low-friction or break-like surface, created using AM.

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Effect of Carbon Diffusion on Friction and Wear Behaviors of Diamond-Like Carbon Coating Against Cr-Plating in Boundary Base Oil Lubrication

Cited by 28 publications

References 11 publications

The ta-C Hardness Effect on Wear Properties Under MoDTC Contained Boundary Lubrication

The ta-C Hardness Effect on Wear Properties Under MoDTC Contained Boundary Lubrication

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

Realization of a Novel Morphing Surface Using Additive Manufacturing and Its Active Control in Friction

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