Characteristics of the Transfer Film and Tribological Properties of Oxide/PTFE Composites

Xie, Ting; Zhou, Zheng Hua; Zhen, Xu; Yu, Jian Wei; Jiao, Ming Hua

doi:10.4028/www.scientific.net/amr.631-632.172

Cited by 11 publications

(6 citation statements)

References 8 publications

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“…Therefore, we use a bonding force to express the combined effect of various factors (including tribophysical, tribochemical and tribomechanical effects) on the transfer film (i.e. the bonding strength between the transfer film and the matrix), and the determination of this parameter is based on the related experimental results (Bahadur and Sunkara, 2005; Xie et al , 2013). Bahadur and Sunkara (2005) noted that there is a range of the strength of the bond between the transfer film and the counterface, according to the different kinds of the materials.…”

Section: Numerical Simulation Of the Friction Transfer And Wearmentioning

confidence: 99%

Simulation of effect of counterface roughness on the friction transfer and wear of PTFE sliding against steel

Xie

Lai

Yang

2019

ILT

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Purpose This paper aims to simulate the effect of counterface roughness on the friction transfer and wear of the polymer material sliding against steel. Design/methodology/approach The dynamic process of friction transfer and wear of polytetrafluoroethylene (PTFE) sliding against steel 45 was simulated by the software of particle flow code in two dimensions and a discrete element method. The effect of the counterface roughness was considered in the simulation. The definitions of the transferred particle and worn particle were given. Findings The simulation results showed that a transferred particle layer was formed on the surface of steel 45 during friction. The wear rate of PTFE can be effectively reduced by the formation of the transferred particle layer. The formation and stability of this particle layer is certainly affected by the counterface roughness (Rz). In this paper, the transferred particle numbers increased with Rz increase. And so did the worn particle numbers. However, there was little effect of Rz on the wear rate of PTFE. Originality/value The dynamic process of the friction transfer and wear of the PTFE/ steel 45 friction pair was reproduced at the micro-level. Then, the transfer and wear were quantitatively exhibited. The relations between the transfer or wear and counterface roughness was simulated and discussed. It will be meaningful for the optimization and effective control of friction and wear of polymer/metal sliding system.

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Section: Numerical Simulation Of the Friction Transfer And Wearmentioning

confidence: 99%

Simulation of effect of counterface roughness on the friction transfer and wear of PTFE sliding against steel

Xie

Lai

Yang

2019

ILT

Self Cite

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“…Whereas the composite contained clear regions of high and low hardness from the epoxy and PTFE, respectively, the wear surface exhibited uniformly low hardness, suggesting that a running film of PTFE was preferentially drawn over the entire surface; these PTFE running films were thought to substantially decrease friction and wear by preventing adhesion between the epoxy phase and the counterbody. Xie et al [57,58] measured two particle-filled PTFE microcomposite transfer films using nanoindentation and found the lower wear system has a slightly softer and more adhesive transfer film. The fact that transfer films can become harder or softer than either constituent reflects the complicated and yet uncertain role of transfer films in friction and wear control.…”

Section: Mechanical Properties Of the Transfer Filmmentioning

confidence: 99%

“…The adhesion strength between transfer films and counterfaces is among the most frequently discussed mechanisms of wear reduction for polymeric solid lubricants [3,[8][9][10][58][59][60][61][62]. Adhesion is often thought of in terms of bonding and may have physical or chemical origins [44,[63][64][65][66][67].…”

Section: Adhesion Of the Transfer Filmmentioning

confidence: 99%

A Review of Transfer Films and Their Role in Ultra-Low-Wear Sliding of Polymers

2016

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Abstract:In dry sliding conditions, polytetrafluoroethylene (PTFE) composites can form thin, uniform, and protective transfer films on hard, metallic counterfaces that may play a significant role in friction and wear control. Qualitative characterizations of transfer film morphology, composition, and adhesion to the counterface suggest they are all good predictors of friction and, particularly, wear performance. However, a lack of quantitative transfer film characterization methods and uncertainty regarding specific mechanisms of friction and wear control make definitive conclusions about causal relationships between transfer film and tribological properties difficult. This paper reviews the state of the art in the solid lubricant transfer film literature and highlights recent advances in quantitative characterization thereof.

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“…The literature indicated that when the temperature is higher than the melting point of the binder, the fluorinated polymer coating would be stratified, that is, the polyacrylate is near the substrate, while the PTFE is distributed in the upper layer. This stratified structure would be beneficial to the improvement of adhesion strength, and the transfer film with better adhesion strength as well as mechanical property is reported to be useful to enhance the tribological properties of the composite . (2) The mechanism of hard fillers to improve the wear resistance of PTFE is mainly attributed to the preferential load supporting capacity .…”

Section: Resultsmentioning

confidence: 99%

Coating of polytetrafluoroethylene/polyacrylate: Core‐shelled structure and tribological behaviors

Wang

Ren

et al. 2019

J of Applied Polymer Sci

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In order to improve the tribological properties of polytetrafluoroethylene (PTFE), the core-shelled PTFE/polyacrylate nanoparticles were prepared by seed emulsion polymerization and its tribological behaviors were investigated. The core-shell structure was determined by a Fourier transform infrared spectrometer and transmission electron microscopy. The results of thermoanalysis showed that polyacrylate had lost more weight than PTFE/polyacrylate composite above 300 C, which indicated an improvement in the thermal stability. Moreover, the friction and wear results indicated that friction coefficient of PTFE/polyacrylate coating keeps at a relatively lower level, which is between that of PTFE and polyacrylate, and the wear volume is the smallest, so that an excellent performance of low friction and wear resistance was demonstrated. Besides, the tribological properties of the core-shelled coating are maintained to be stable under high load or high speed. Therefore, the core-shelled nanoparticles would be potential to polymer coating as high-performance solid lubricants.

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Characteristics of the Transfer Film and Tribological Properties of Oxide/PTFE Composites

Cited by 11 publications

References 8 publications

Simulation of effect of counterface roughness on the friction transfer and wear of PTFE sliding against steel

Simulation of effect of counterface roughness on the friction transfer and wear of PTFE sliding against steel

A Review of Transfer Films and Their Role in Ultra-Low-Wear Sliding of Polymers

Coating of polytetrafluoroethylene/polyacrylate: Core‐shelled structure and tribological behaviors

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