The Development of Hydrogen-free DLC-coated Valve-lifter

Mabuchi, Yutaka; Hamada, Takahiro; Izumi, Hiroyuki; Yasuda, Yoshiteru; Kano, Makoto

doi:10.4271/2007-01-1752

Cited by 33 publications

(17 citation statements)

References 6 publications

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“…3). Some of the engine parts and assemblies which showed improved tribological performance after depositing DLC coatings include fuel injection system, 13,35,36 piston assembly, [37][38][39] bearings, 40,41 valve train assembly, [42][43][44][45][46][47][48] and gears. 49,50 Because of their biocompatibility and outstanding material properties such as high hardness, low friction, corrosion resistance, and moderate wear of counterbodies, DLC coatings found number of applications in the field of biomedical engineering.…”

Section: Applications Of Dlc Coatingsmentioning

confidence: 99%

Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A review

et al. 2016

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Tribological performance of industrial applications involving boundary lubrication regime can be improved by depositing surface coatings such as diamond-like carbon (DLC) on the interacting surfaces. DLCs are considered as hard coatings with unique combination of properties which results in minimizing the friction induced energy and material losses especially under starved lubrication conditions. In spite of high wear-resistance and ultralow friction coefficients, there are a lot of factors that can directly influence the tribological characteristics of DLC coatings. Although, many studies were conducted to comprehend the effects of intrinsic/extrinsic conditions on tribological behavior of these coatings, still there is a lack of understanding due to contradictory remarks. Therefore, there is a need to rearrange the published data in an organized manner for logical continuation of research. In this paper, a brief introduction of DLC coatings is presented followed by detailed discussion on conditions that can directly influence their tribological properties.

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Section: Applications Of Dlc Coatingsmentioning

confidence: 99%

Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A review

et al. 2016

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“…Also the creation of a low friction coefficient can take place by the creation of a low friction transfer film, where the low coefficient of friction is reached by the catalyst effect of the counterpart material with the coating (28). Nissan has reported that in practice they reached a reduction of 50% with special oil (32). Ta-C coatings are nonhydrogenated carbon-based DLC films.…”

Section: Tribological (Component) Coatingsmentioning

confidence: 99%

Large-Scale Industrial Coating Applications and Systems

Tietema

2014

Comprehensive Materials Processing

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“…A decrease in the surface roughness of the block specimen tends to reduce the friction coefficient. It is generally understood that the friction property can be frequently organized by the composite roughness [14]. In this study, it is considered that the influence of the roughness of the block is predominately presented, since the hardness of the block surface coated with the B-DLC or DLC is much higher that of the ring made of steel.…”

Section: Dlc-1 Dlc-2 Dlc-3 B-dlc B-dlc (6b-dlc) (6b-dlc)mentioning

confidence: 99%

Low Friction Property of Boron Doped DLC under Engine Oil

et al. 2017

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DLC films are of significant interest for automobile parts, because they possess the potential to improve the friction property under oil lubricated conditions. In order to obtain further low friction, we focused on the combination of boron doped DLC (B-DLC) and the Mo-trimer as a lubricating oil additive, and the influence of the boron concentration on the friction property of the B-DLC films was evaluated by a block on ring type test. Compared to DLC films without boron, the B-DLC films exhibited an extremely low friction coefficient below 0.03 ranging from 2 to 12 at% in boron concentration under the lubricating condition using the engine oil containing the Mo-trimer. It was found that the surface roughness of the B-DLC films rubbed in the oil containing the Mo-trimer became particularly smooth below 2 nm measured by an atomic force microscope. On the wear surface of the B-DLC films, Mo3S7 -derived from the Mo-trimer was selectively confirmed as having a uniform distribution by time-of-flight secondary ion mass spectrometry. Based on the obtained results of surface measurements and analyses, it was suggested that the B-DLC films exhibited a low friction property primarily caused by the nano-scale smooth surface, disturbing the adsorption of the other additives and the transfer reaction products from the counter parts by forming a selective adsorbed Mo-trimer film on the B-DLC surface.

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The Development of Hydrogen-free DLC-coated Valve-lifter

Cited by 33 publications

References 6 publications

Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A review

Influence of intrinsic and extrinsic conditions on the tribological characteristics of diamond-like carbon coatings: A review

Large-Scale Industrial Coating Applications and Systems

Low Friction Property of Boron Doped DLC under Engine Oil

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