Long-term low-friction of Ti-overcoated and-doped DLCs: Robustly developed carbonous transfer layer with titanium

Kim, Jae-Il; Lee, Wooyoung; Tokoroyama, Takayuki; Umehara, Noritsugu

doi:10.1016/j.carbon.2022.12.012

Cited by 18 publications

(12 citation statements)

References 49 publications

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“…Our results were in good agreement with these studies. From our previous study, Ti built-up a well-developed transfer layer on the counterpart owing to its adhesive and reactive characteristic. In Ti-DLC/steel tribopair, the carbonaceous transfer layer contacted Ti-DLC to form a C / C contact interface.…”

Section: Resultsmentioning

confidence: 99%

“…A Ti-DLC was fabricated on a steel disk (AISI 52100; hardness = ∼8 GPa) via a hybrid coating system equipped with a filtered cathodic vacuum arc (FCVA) and an unbalanced magnetron sputter (UBMS), which was detailed in our earlier work. 4 Briefly, the substrate was cleaned with benzene and acetone in an ultrasonic bath for 15 min each, and argon plasma was irradiated on the surface to decontaminate in a vacuum chamber. For deposition, UBMS and FCVA were discharged simultaneously to synthesize a homogeneous Ti-DLC coating.…”

Section: Methodsmentioning

confidence: 99%

“…Ti-DLC was fabricated in an effort to establish a C/C contact interface. 4 We discussed the influence of environmental factors on the C/C contact interface and the relationship with water adsorbed on the DLC surface. Finally, we hypothesized the effect of these on carbon structure change, and temperature could control the friction performance of Ti-DLC.…”

Section: Introductionmentioning

confidence: 99%

“…Herein, we attempted to control friction by using environmental factors such as temperature, gas, and humidity in the Fe/Ti-DLC tribo-system. Ti-DLC was fabricated in an effort to establish a C / C contact interface . We discussed the influence of environmental factors on the C / C contact interface and the relationship with water adsorbed on the DLC surface.…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Among Me-DLCs, we previously reported that Ti-doped DLC (Ti-DLC), having excellent carbon affinities, achieved long-term low friction in DLC/steel tribopair. 4 Ti-DLC made adhesion between ferrous metal and the transfer layer better, resulting in a high C/C contact ratio and low friction. In addition to the formation of a carbonaceous transfer layer, the friction performance of DLC is highly environmentally sensitive: lubricating fluid (i.e., gas, 5−7 gel, 8 and liquid 9 ), operating temperature, 10,11 humidity, 12 and additives.…”

Section: Introductionmentioning

confidence: 99%

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Superlubricity with Graphitization in Ti-Doped DLC/Steel Tribopair: Response on Humidity and Temperature

Kim

Lee

Tokoroyama

et al. 2023

ACS Appl. Mater. Interfaces

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The anti-friction of diamond-like carbon (DLC) is achieved by a well-developed carbonaceous transfer layer, and Ti-doped DLC is developed into a robustly built-up carbonaceous transfer layer. The friction performance of DLC depends on the operating environment, e.g., ambient gas, humidity, temperature, lubricants, and mating material. In this study, we aimed to reveal the environmental sensitivities of Ti-DLC on friction characteristics. To this end, a Ti-DLC was rubbed against a steel ball, and friction behaviors were evaluated with different gas compositions, humidity, and temperature. Finally, we identified that fractional coverage of water on surfaces affected the anti-graphitization on Ti-DLC, leading to avoiding friction reduction.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Superlubricity with Graphitization in Ti-Doped DLC/Steel Tribopair: Response on Humidity and Temperature

Kim

Lee

Tokoroyama

et al. 2023

ACS Appl. Mater. Interfaces

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Enhancing Cutting Tool Performance through ta-C:Ta Coating for CFRP Dry Machining: Investigation of Wear Resistance and Cutting Forces

Suzuki,

Tokoroyama,

Takita

et al. 2024

Mechanisms and Machine Science

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Influence of methane flow ratios on the structural and mechanical properties of Ti-doped diamond-like carbon films

Lee,

Hu,

Sun

et al. 2023

Int J Adv Manuf Technol

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Diamond-like carbon lms with Ti dopant (Ti-DLC) are synthesized by reactive magnetron sputtering using a pure Ti metal target. This study determines the effect of methane ow ratios [R m =CH 4 /(Ar + CH 4 ), ranging from 4 to 12%] on the surface morphology, microstructure, mechanical properties and cermet cutting tool inserts features of Ti-DLC lms. The GIXRD diffraction spectrum for Ti-DLC lm depicts an amorphous structure. There are peaks for nano-crystalline TiC at 2θ values of 35.88 o , 41.52 o and 60.14 o , which respectively correspond to the (111), ( 200) and ( 220) planes of the face centered cubic structure.The characteristic binding energy of C 1s, Ti 2p and O 1s for Ti-DLC lm is determined using a highresolution XPS spectra. Increasing R m ow ratio (reducing Ti metal doping) increases the intensity of the Raman spectrum because there is an increased sp 2 -C (sp 2 /sp 3 ratio) site fraction for DLC components. The experimental results show that the hardness of the DLC lm increases from 11.07 GPa to 14.76 GPa as the R m ow ratio is increased from 4% to 12%. The adhesive strength of the Ti-DLC lm coating is measured using a scratch test and shows that the lm adheres well to the substrate. The Ti-DLC lms are coated onto cutter inserts for the dry milling of an Inconel 718 workpiece and the results show that all coated tools have a signi cantly longer tool life than uncoated tools.

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Long-term low-friction of Ti-overcoated and-doped DLCs: Robustly developed carbonous transfer layer with titanium

Cited by 18 publications

References 49 publications

Superlubricity with Graphitization in Ti-Doped DLC/Steel Tribopair: Response on Humidity and Temperature

Superlubricity with Graphitization in Ti-Doped DLC/Steel Tribopair: Response on Humidity and Temperature

Enhancing Cutting Tool Performance through ta-C:Ta Coating for CFRP Dry Machining: Investigation of Wear Resistance and Cutting Forces

Influence of methane flow ratios on the structural and mechanical properties of Ti-doped diamond-like carbon films

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