Friction and Wear on Single-Layer Epitaxial Graphene in Multi-Asperity Contacts

Marchetto, Diego; Held, Christian; Hausen, Florian; Wählisch, Felix C.; Dienwiebel, Martin; Bennewitz, Roland

doi:10.1007/s11249-012-9945-4

Cited by 104 publications

(80 citation statements)

References 12 publications

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“…3 we show the friction as a function of load for flakes with orientation φ = 0, commensurate to the substrate. The friction linearly increases with load, resulting in a nearly constant friction coefficient µ = F f ric /L = 0.03, which agrees well with the experimental value found for microscale graphene 32 . It is worth noting that µ slightly decreases with size as a result of the fact that atoms at the edges can reach deeper minima and contribute more to the friction.…”

Section: Resultssupporting

confidence: 88%

Superlubric to stick-slip sliding of incommensurate graphene flakes on graphite

et al. 2013

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We calculate the friction of fully mobile graphene flakes sliding on graphite. For incommensurately stacked flakes, we find a sudden and reversible increase in friction with load, in agreement with experimental observations. The transition from smooth sliding to stick-slip and the corresponding increase in friction is neither due to rotations to commensurate contact nor to dislocations but to a pinning caused by vertical distortions of edge atoms also when they are saturated by Hydrogen. This behavior should apply to all layered materials with strong in-plane bonding.

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Section: Resultssupporting

confidence: 88%

Superlubric to stick-slip sliding of incommensurate graphene flakes on graphite

et al. 2013

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“…Except for nanoscale experiments these studies have been performed in ambient conditions at atmospheric pressure. In a previous study, we also showed that graphene epitaxially grown on SiC reduces the friction coefficient μ about 5 times with respect to the substrate and it is lower compared to graphite [21]. These results were obtained in ambient conditions and at room temperature.…”

Section: Introductionsupporting

confidence: 65%

“…Since the interaction between graphene and solvents is not completely clear the samples were not cleaned. Previously we also found no evidence of contamination along several weeks of tests in air [21].…”

Section: Graphene Samplesmentioning

confidence: 46%

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Microscale study of frictional properties of graphene in ultra high vacuum

2015

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Abstract:We report on the frictional properties of epitaxial graphene on SiC in ultra high vacuum. Measurements have been performed using a microtribometer in the load regime of 0.5 to 1 mN. We observed that a ruby sphere sliding against graphene results in very low friction coefficients ranging from 0.02 to 0.05. The friction and also the stability of the graphene layer is higher than that under similar conditions in ambient conditions. The friction shows a load dependence. Finally it was found that graphene masks the frictional anisotropy which was observed on the SiC surface.

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“…In recent years, a large number of researchers have studied the tribological properties of the microscopic properties of graphene and the tribological properties of the macroscopic properties [7][8][9][10][11][12] . If the rigidity and thermal conductivity of the graphene are combined with the toughness and the workability of polyimide, graphene as a filler will significantly enhance and improve the mechanical and tribological properties of composites.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of graphene modified porous oil retainer materials

Niu¹,

Jian-hu²,

Ni³

et al. 2018

Proceedings of the 2018 8th International Conference on Manufacturing Science and Engineering (ICMSE 2018)

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Porous oil retainer is a key factor to ensure good lubrication of the inertial navigation bearings. The PTFE/PI porous retainer made of the original recipe and process preparation, in the high-speed operation, will appear serious wear, high temperature rise, a large amount of oil loss in the micro pores due to expansion and other issues. These lead to the lubrication life greatly reduced. It cannot meet the high-speed and long-time operation requirements of high-precision bearings. In this paper, a improved porous retainer composite is developed, which is using porous PI as the matrix , graphene as the enhancing modified additives, and PTFE as lubricating modified additives. The improved porous retainer composite is prepared by using the constant volume sintering method. The effect of graphene addition on the mechanical properties and tribological properties of porous retainer composites is studied. The results show that the high strength properties of graphene and the good wear resistance performance of PTFE improve the porous polyimide retainer composites.

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Friction and Wear on Single-Layer Epitaxial Graphene in Multi-Asperity Contacts

Cited by 104 publications

References 12 publications

Superlubric to stick-slip sliding of incommensurate graphene flakes on graphite

Superlubric to stick-slip sliding of incommensurate graphene flakes on graphite

Microscale study of frictional properties of graphene in ultra high vacuum

Performance analysis of graphene modified porous oil retainer materials

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