A molecular dynamics study on water lubrication of PTFE sliding against copper

Song, Jingfu; Zhao, Gai

doi:10.1016/j.triboint.2019.03.070

Cited by 62 publications

(23 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All-atom simulation methods have been used to study the morphology and intermolecular interactions of PTFE molecular chains. By designing molecular-scale PTFE friction systems, they successively studied the effects of load, [26] temperature, [31] fluorocarbon small molecule, [27] molecular chain orientation, [27,28] and water molecules [32] on the tribological properties of pure PTFE. In combined experiments and MD simulations, they revealed the effects of speed, load, and temperature on the friction behavior of PTFE/PTFE tribo-pair.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Poly(tetrafluoroethylene) and Its Composites Reinforced by Carbon Nanotubes and Graphene Sheets: Molecular Dynamics Simulation

Zhang

et al. 2021

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

Low‐dimensional fillers play an important role in improving the tribological properties of poly(tetrafluoroethylene) (PTFE) composites. However, the reinforcement mechanism is not fully understood, since few in situ experiments are able to capture the dynamics evolution and interfacial behavior of fillers. Herein, the tribological behavior of PTFE composites filled with graphene (Gr) sheets and carbon nanotubes (CNT) at the nanoscale is investigated. The results demonstrate that the composites filled with the CNT and Gr fillers have much better wear resistance than that of the pure PTFE, and the wear amounts are reduced by 76.2% and 85.7%, respectively. The relative bond and angle energy of PTFE indicate less deformation in the reinforced composite matrices. The calculations of interfacial interaction energy and radial distribution function reveal that the Gr fillers have better reinforcements than CNT due to stronger interactions at the Gr/PTFE interfaces.

show abstract

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Poly(tetrafluoroethylene) and Its Composites Reinforced by Carbon Nanotubes and Graphene Sheets: Molecular Dynamics Simulation

Zhang

et al. 2021

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

show abstract

“…However, seal pairs often fail in various fluid machineries, especially after the contamination of sealed media. 4 In recent years, the tribological behavior of PTFE and PTFE-based composites has been widely reported under dry sliding 5 or water lubrication 6 conditions, to explore the factors affecting the wear resistance and friction reduction. The contact stress between friction pairs influences tribological behaviors (e.g.…”

Section: Polytetrafluoroethylenementioning

confidence: 99%

Effect of contact stress on the tribology behaviors of PTFE/316L seal pairs under various abrasive-contained conditions

Shen

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

This study focuses on the tribological characteristics of polytetrafluoroethylene rubbing against 316L stainless steel in the presence of various Al2O3 abrasive particles. The ranges of the contact stresses and abrasive sizes were 2.50–5.01 MPa and 2.0–230 µm, respectively. The evolution of the coefficient of friction, abrasive invasion behavior and damage characteristics on worn surfaces, and the transformation of damage mechanisms under different contact stresses are summarized. Results demonstrate that contact stress exerts a considerable effect on abrasive invasion behavior, the coefficient of friction trends become complicated at low contact stress. With decreasing particle sizes under a contact stress of 2.50 MPa, the wear failure changes from two-body wear to three-body wear, or two wear behaviors exist simultaneously. As contact stress increases, the wear mechanism is gradually simplified. The particle size threshold that causes the change of the wear mechanism is also gradually reduced. The wear rate of polytetrafluoroethylene has no linear relationship with abrasive size, whereas wear increases with contact stress. Under 2.50 MPa conditions, the particles easily invade the tribo-interface in the friction process, thus increasing the wear rate of the metallic counterpart. In addition, with increases contact stress, the polytetrafluoroethylene material transfers to the counterface, and local adhesion occurs. When the contact stress is increased to 5.01 MPa, polytetrafluoroethylene even shows an obvious creep.

show abstract

“…The MD simulation has been widely used in the study of micro-friction behavior at the micro-nanoscale. Song et al [24] established MD models of the Polytetra uoroethylene (PTFE) sliding against copper (Cu) substrate under dry friction and water lubrication, respectively. The average friction coe cient of PTFE decreases from 0.189 to 0.064 under water lubrication, which dramatically reduces the wear of PTFE compared with that of dry friction.…”

Section: Introductionmentioning

confidence: 99%

Lubrication Behavior of n-hexadecane on ZnO Layer at the Nanoscale: A Molecular Dynamic Exploration

Ren

Liu

et al. 2022

Tribol Lett

View full text Add to dashboard Cite

In this work, the lubricating models of Cu-Zn alloy with and without the Zinc oxide (ZnO) layer were established. Molecular dynamics (MD) simulation is employed to investigate the lubrication behavior of n-hexadecane on the ZnO layer at the nanoscale. The diffusion of lubricant molecules, and the interaction and stick-slip effect between the friction pairs and the lubricants are systematically explored. The results show that the ZnO layer limits the diffusion of n-hexadecane molecules and the formed lubricating lms in the model of the substrate with the ZnO layer are obvious and stable. During the sliding process, ZnO molecules have strong interaction with lubricants molecules and adsorb lubricants molecules on the surface to form adsorption lm. The stick-slip effect in the lubricating lms generates periodic shear stress and reduces the wear of the friction pair. The ZnO layer causes lubricants molecules to be arranged regularly on the surface into a stable structure to sustain the greater load. HighlightsZnO layer limits the diffusion of n-hexadecane molecules.ZnO molecules have stronger interaction with lubricants molecules. n-hexadecane gathers and forms adsorption lm near the ZnO surface. stick-slip effect in the lubricating lms reduces the wear. lubricants molecules arrange regularly on the ZnO surface to sustain high load.

show abstract

A molecular dynamics study on water lubrication of PTFE sliding against copper

Cited by 62 publications

References 19 publications

Tribological Behavior of Poly(tetrafluoroethylene) and Its Composites Reinforced by Carbon Nanotubes and Graphene Sheets: Molecular Dynamics Simulation

Tribological Behavior of Poly(tetrafluoroethylene) and Its Composites Reinforced by Carbon Nanotubes and Graphene Sheets: Molecular Dynamics Simulation

Effect of contact stress on the tribology behaviors of PTFE/316L seal pairs under various abrasive-contained conditions

Lubrication Behavior of n-hexadecane on ZnO Layer at the Nanoscale: A Molecular Dynamic Exploration

Contact Info

Product

Resources

About