Investigation of the effect of stainless-steel grain size on the continuity of graphene frictional behavior using molecular dynamics (MD) simulation

Guo, Wanmin; Bai, Qingshun; Dou, Yuhao; Wang, Hongfei; Chen, Shandeng

doi:10.1016/j.commatsci.2023.112210

Cited by 3 publications

(1 citation statement)

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“…The phenomenon of graphene bulge is also observed in the simulation, as shown in Figure 2b for the stainless steel substrate graphene. In existing studies, it is found that the friction force of graphene tightly adsorbed on stainless steel grains in nanofriction is small, and the bulging graphene causes an increase in friction force; 58 the correlation between friction force and bulged graphene is described in Supporting Information 5. Although the bulge region only occupies a portion of the total graphene area, this bulging graphene is the key to causing the friction fluctuation, and the friction force in this region is the largest, which directly reflects the lubrication efficiency of graphene.…”

Section: Resultsmentioning

confidence: 99%

Effect of Normal Load on the Nanofriction Behavior of Graphene on Stainless-Steel Substrate: Implication for Nanoscale Lubrication

Guo,

Bai,

Dou

et al. 2024

ACS Appl. Nano Mater.

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Graphene on a stainless steel substrate will appear as localized bulges, and these bulges will lead to large fluctuations in friction force, which is the key to influencing the lubrication efficiency of graphene. Here, the effect of normal load on the nanofriction behavior of the bulged graphene on a stainless steel substrate is investigated. In the normal load study interval from 20 to 110 nN, an increment of 10 nN of normal load can increase friction force the more the normal load increases, and the two are not linearly correlated. The friction force in the graphene bulge region consists of two parts: the first part originates from the interaction of the graphene material itself in contact with the tip, and the second part originates from the resistance due to the pileup of graphene deformation in front of the tip. The nonlinear correlation between the normal load and friction force is mainly related to the pile-up effect of bulged graphene. In addition, the friction force increase due to the graphene bulge region needs to go through a process, which is divided into two stages. The first stage is the increase in friction force due to the tip starting to contact the bulged graphene and the contact area increasing. The second stage is the increase in friction force due to the graphene regulating its configuration and repeatedly interacting with the tip. The normal load is linearly related to the first stage but not linearly related to the second stage. The nonlinear correlation between the normal load and friction force is mainly related to the second stage of friction force rise. Therefore, the change of normal load affects the stacking effect and the ability to regulate the configuration of bulged graphene, which leads to a nonlinear increase of friction force. This contributes to the application of graphene for nanolubrication of stainless-steel components in MEMS.

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Section: Resultsmentioning

confidence: 99%