Ultra-low friction properties of carbon nitride tantalum coatings in the atmosphere

Tokoroyama, Takayuki; Hattori, Takafumi; Umehara, Noritsugu; Kousaka, Hiroyuki; Manabe, Kazuyoshi; Kishi, Misato; Fuwa, Yoshio

doi:10.1016/j.triboint.2016.07.015

Cited by 33 publications

(9 citation statements)

References 28 publications

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“…However, it is difficult to achieve both low friction and wear resistance using multiple additives, because additives developed for steel materials have been reported to promote wear on the surface of DLC coatings [1][2][3][4][5][6][7][8][9][10], and when multiple additives are used simultaneously, the target additive is not adsorbed on the surface [5,11,12]. The search for the optimal additive is ongoing because DLC is roughly devided tetrahedral amorphous carbon (ta-C) [13][14][15][16][17][18][19][20], hydrogenated amorphous carbon (a-C:H) [21][22][23][24][25][26], amorhous carbon (a-C) and other doped one [27][28][29][30][31][32][33][34]. Thus, conventional additives prepared for steel-based materials have not been sufficiently effective for DLC coatings, which have become popular in recent years.…”

Section: Introductionmentioning

confidence: 99%

Effect of phosphonate additives with hydroxy groups on tribological properties of ta-C coatings under boundary lubrication

Kento

Tokoroyama

Umehara

et al. 2023

Preprint

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In recent years, the range of applications of DLC coatings has been expanding, and finding the optimal additives for DLC coatings is an urgent issue. In this study, friction tests were conducted on ta-C/ta-C tribopair using a phosphonate additive with hydroxy groups, which is a combination of GMO (an additive that reduces friction of DLC) and ZDDP (an additive that reduces wear), and tribolayers after friction tests were analyzed using AFM, XPS and ToF-SIMS. The results showed that the phosphonate additive with hydroxy groups tribochemically reacted with the ta-C coating to form a low-shear, hard triblayer on the surface, thereby reducing the friction and wear of the ta-C coating.This indicates that additives with phosphonate structures and hydroxy groups are effective for DLC coatings.

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Section: Introductionmentioning

confidence: 99%

Effect of phosphonate additives with hydroxy groups on tribological properties of ta-C coatings under boundary lubrication

Kento

Tokoroyama

Umehara

et al. 2023

Preprint

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“…To achieve this goal, DLC coatings with different carbon structures were utilized: ta-C (tetrahedral amorphous carbon) coatings [23][24][25] and GNC (graphene nanocrystallites) coatings [26][27][28]. Additionally, the effect of metal doping was evaluated by depositing Tantalum-doped ta-C and GNC coatings, studying their friction properties in a lubricant containing MoDTC [29,30]. The characteristics of the tribo lm uctuates during friction, which has effect on the friction coe cient [31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Carbon Structure of DLC Coatings on Friction Characteristics of MoDTC-derived Tribofilm by Using an in situ reflectance spectroscopy

Hashizume,

Yamamoto,

Chen

et al. 2023

Preprint

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In this paper, we prepared 6 types of DLC coatings with varying carbon structures (amorphous ta-C coating and GNC coatings that include nano graphite crystals) and different doped Ta amounts to study friction characteristics. Results from the friction test with MoDTC-added lubricant revealed that DLC coatings with a higher ID/IG ratio exhibited a lower friction coefficient. Furthermore, in situ observations using a reflectance spectroscopy showed that the tribofilm formed on the DLC coatings with a higher ID/IG ratio maintained a higher MoS2 / (MoS2 + MoO3) ratio. This ratio strongly correlated with its friction coefficient. From the measurement of a work function of each DLC coating, the DLC coatings with a higher ID/IG ratio had a higher work function, which indicated to include larger amount of the defect of graphite structure. This active defect of graphite structure was considered to enhance the friction reduction effect of MoDTC. The findings of this paper suggest a material design concept for a DLC coating that amplifies the effects of lubricant additives in reducing friction.

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“…Carbon film is a common tribological material [18]. There are already studies reported low or ultra-low friction coefficient due to structural change of the carbonaceous coatings led to graphitization of topmost surface by experimental [19][20][21] or simulations [22,23]. Those reported studies implied the effect of graphitization at the topmost surface leading to low friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

Fan

Huang

2022

Friction

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Carbon films with two different kinds of sp2 nanocrystallited structure were investigated to study the stick-slip friction with the in-situ and ex-situ tests. In-situ transmission electron microscope (TEM) observation and nanofriction tests revealed that the origins of stick and slip varied with shear stress and film deformation. At the stick stage, shear stress gradually increased with the contact strengthened until reached the shear strength to break the interfacial adhesion; at the slip stage, the shear stress decreased and accompanied with film deformation. During the sliding process, adhesive deformation resulted in the large stick-slip step while ploughing deformation led to a smoother step. Ex-situ nanofriction tests on a series of sp2 nanocrystallited carbon films with different irradiation energies showed the expected sliding behavior with the in-situ results. This study first clarified the mechanism of stick-slip friction with the in-situ TEM observation, which plays the important role for the micro and nano application of sp2 nanocrystallited carbon films.

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Ultra-low friction properties of carbon nitride tantalum coatings in the atmosphere

Cited by 33 publications

References 28 publications

Effect of phosphonate additives with hydroxy groups on tribological properties of ta-C coatings under boundary lubrication

Effect of phosphonate additives with hydroxy groups on tribological properties of ta-C coatings under boundary lubrication

The Effect of Carbon Structure of DLC Coatings on Friction Characteristics of MoDTC-derived Tribofilm by Using an in situ reflectance spectroscopy

In-situ TEM studies on stick-slip friction characters of sp2 nanocrystallited carbon films

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