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3. Macroscale superlubricity of Si-doped diamond-like carbon film enabled by graphene oxide as additives.

Author

Yi, Shuang, Chen, Xinchun, Li, Jinjin, Liu, Yanfei, Ding, Songlin, and Luo, Jianbin

Subjects
*DIAMOND-like carbon, *GRAPHENE oxide, *AMORPHOUS carbon, *NANOSTRUCTURED materials, *SILICA gel, *PHYSISORPTION, *ETHYLENE glycol
Abstract

Carbon-based materials including diamond-like carbon (DLC) and graphene have been demonstrated as extraordinary lubricating materials due to its specific structure and weakness of the interlayer interactions. In this work, the extreme coefficient of friction (COF = 0.002) was achieved on the silicon-doped hydrogenated amorphous carbon (a-C:H:Si) film by lubrication with graphene oxide (GO) nanosheets as additives in ethylene glycol. The tribochemical reactions occurred on the Si 3 N 4 surface and a-C:H:Si film, leading to the formation of the silica colloid layer on both Si 3 N 4 and a-C:H:Si surfaces. In the meantime, the physical adsorption of GO nanosheets on the friction surfaces makes the shear plane transfer from Si 3 N 4 /a-C:H:Si interface to GO/GO interface, which results in a further reduction of shear stress. The mechanism and modelling of a-C:H:Si and GO nanosheets synergistic lubrication effect was finally established to reveal the design principle of superlubricity at macroscale. [Display omitted] [ABSTRACT FROM AUTHOR]

Published
2021
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4. Superlubricating UHMWPE composites with functionalized carbon nanotubes reinforcement applicable to artificial joints.

Author

Xu, Jianing, Han, Tianyi, Zhang, Chenhui, and Luo, Jianbin

Subjects
*ARTIFICIAL joints, *CARBON composites, *CARBON nanotubes, *MECHANICAL wear, *ULTRAHIGH molecular weight polyethylene, *STRENGTH of materials
Abstract

Polyelectrolyte-grafted ultra-high-molecular-weight polyethylene (UHMWPE) has been proven efficient in friction and wear reduction. However, owing to the damaged molecular structure and material stability, the modified material experiences compromised mechanical and tribological properties under immersed, aqueous working environment. To achieve enhanced material strength and water resistance, carbon nanotubes (CNTs) were modified and used as reinforcing agent. Nanoindentation tests and macroscopic reciprocating friction tests have shown significant improvements in mechanical and tribological properties: friction coefficient and wear rate down to 0.0086 and 5.6 × 10−8 mm3(Nm)-1 under saline-lubricated conditions, which maintained relatively stable during 120-day saline pre-soaking. This combination of strong hydration lubrication and superior material strength offers a promising design of superlubricating artificial cartilage with high wear resistance and long lifetime. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Investigation on the lubrication potential of graphene oxide aqueous dispersion for self-mated stainless steel tribo-pair.

Author

Singh, Sudesh, Chen, Xinchun, Zhang, Chenhui, Tyagi, Rajnesh, and Luo, Jianbin

Subjects
*GRAPHENE oxide, *STAINLESS steel, *CONSERVATION of natural resources, *ENVIRONMENTAL protection, *SHEAR strength, *LUBRICATION & lubricants, *TRIBOLOGY
Abstract

Due to high concerns for environmental protection and resource conservation, water-based lubrication with some additives is gaining the attention of researchers. Hence, the present study has been conducted to explore the tribological potential of lubricant containing graphene oxide (GO) as an additive in water. The friction and wear performance was evaluated for self-mated SS 304 under reciprocating sliding using a ball-on-disc configuration under high contact stress (∼1.42 GPa or higher). The results indicate that 0.1 wt% is the optimum content of graphene oxide under the conditions used in the study and has the capability to reduce friction coefficient from 0.56 (pure water) to 0.12 with an attendant reduction in wear volume by 68%. The enhancement in tribological performance has been attributed to the formation of a low shear strength tribo-layer of graphene on the surface of both the ball and the disc. The effect of normal load and sliding speed for optimized concentration was also investigated. The average coefficient of friction was observed to increase with load whereas, it was observed to decrease with increase in speed till 0.05 m/s beyond which it increased. • Keeping in view the environmental concerns, the potential of GO nano-sheets as an additive in water has been explored for self-mated steel pair. • A significant reduction in friction coefficient of the system (from 0.56 to 0.12) has been observed with the addition of 0.1 wt.% GO in water. • Improved tribological performance has been attributed to the adsorption of GO and formation of a low shear-strength tribo-layer on steel-pairs. [ABSTRACT FROM AUTHOR]

Published
2019
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26. Investigation of running-in process in water-based lubrication aimed at achieving super-low friction.

Author

Deng, Mingming, Li, Jinjin, Zhang, Chenhui, Ren, Jing, Zhou, Ningning, and Luo, Jianbin

Subjects
*LUBRICATION & lubricants, *FRICTION, *SILICON nitride, *SULFURIC acid, *GLYCERIN, *ELASTOHYDRODYNAMIC lubrication
Abstract

In this work, effects of running-in process on achieving super-low friction between silicon nitride ball and sapphire disc under lubrication of mixtures of sulfuric acid and glycerin, was investigated. The results revealed that sulfuric acid plays the key role in the running-in process. Owing to this acid, a smooth worn region was generated on the silicon nitride ball through chemical-mechanical abrasion, which provided favorable conditions for super-low friction under elastohydrodynamic lubrication. Meantime, a silica layer formed on part of the worn region through tribochemical reaction during running-in process, contributing to the realization of super-low friction under boundary and mixed lubrication. Moreover, the adsorption of hydrogen ions on friction surfaces generated a repulsive double-layer force that also contributed to super-low friction. [ABSTRACT FROM AUTHOR]

Published
2016
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