Wear Debris Mobility, Aligned Surface Roughness, and the Low Wear Behavior of Filled Polytetrafluoroethylene

Harris, Kathryn L.; Curry, John F.; Pitenis, Angela A.; Rowe, Kyle G.; Sidebottom, Mark A.; Sawyer, W. Gregory; Krick, Brandon A.

doi:10.1007/s11249-015-0581-7

Cited by 26 publications

(25 citation statements)

References 57 publications

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“…The reduction in the friction coefficient with the sliding distance in fault lubrication processes 56 provides another consistent observation, under the reasonable assumption that wear rate and friction variations are similar under those conditions 57,58 . Likewise, shear experiments on rocks have shown vanishing wear rates in a three-body steady-state configuration 58 , and wear experiments have displayed a reduction in the wear rate if the wear debris is not evacuated 53,59,60 . We ascribe the change in the wear rate, i.e.…”

Section: Resultsmentioning

confidence: 99%

Emergence of self-affine surfaces during adhesive wear

et al. 2019

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Friction and wear depend critically on surface roughness and its evolution with time. An accurate control of roughness is essential to the performance and durability of virtually all engineering applications. At geological scales, roughness along tectonic faults is intimately linked to stick-slip behaviour as experienced during earthquakes. While numerous experiments on natural, fractured, and frictional sliding surfaces have shown that roughness has self-affine fractal properties, much less is known about the mechanisms controlling the origins and the evolution of roughness. Here, by performing long-timescale molecular dynamics simulations and tracking the roughness evolution in time, we reveal that the emergence of self-affine surfaces is governed by the interplay between the ductile and brittle mechanisms of adhesive wear in three-body contact, and is independent of the initial state.

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Section: Resultsmentioning

confidence: 99%

Emergence of self-affine surfaces during adhesive wear

et al. 2019

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“…Changes in load [49], velocity [6,49] and counterface roughness [13,28,32,50] can all change the system's wear performance by affecting the transfer film's mechanical and adhesive strength.…”

Section: Chemistry Of the Transfer Filmmentioning

confidence: 99%

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

Burris

Xie

2016

Lubricants

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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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“…As the friction process progresses, this third body is likely to enter the contact area to bear the load by separating the asperities of the friction surfaces to reduce the adsorption force of the friction interface [ 28 ], or by forming a transfer layer with excellent adhesive force to prevent direct contact between the asperities of the test pieces and the counter material. In either case, the base materials are protected [ 37 , 60 ]. Compared with IF-MoS 2 , the 2H-MoS 2 additive forms particles and debris with larger sizes, which cannot easily enter the contact area and thus provide less protection for the base materials.…”

Section: Resultsmentioning

confidence: 99%

Tribological Performance of Green Lubricant Enhanced by Sulfidation IF-MoS2

Shi

2016

Materials

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Biopolymers reinforced with nanoparticle (NP) additives are widely used in tribological applications. In this study, the effect of NP additives on the tribological properties of a green lubricant hydroxypropyl methylcellulose (HPMC) composite was investigated. The IF-MoS2 NPs were prepared using the newly developed gas phase sulfidation method to form a multilayered, polyhedral structure. The number of layers and crystallinity of IF-MoS2 increased with sulfidation time and temperature. The dispersity of NPs in the HPMC was investigated using Raman and EDS mapping and showed great uniformity. The use of NPs with HPMC enhanced the tribological performance of the composites as expected. The analysis of the worn surface shows that the friction behavior of the HPMC composite with added NPs is very sensitive to the NP structure. The wear mechanisms vary with NP structure and depend on their lubricating behaviors.

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Wear Debris Mobility, Aligned Surface Roughness, and the Low Wear Behavior of Filled Polytetrafluoroethylene

Cited by 26 publications

References 57 publications

Emergence of self-affine surfaces during adhesive wear

Emergence of self-affine surfaces during adhesive wear

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

Tribological Performance of Green Lubricant Enhanced by Sulfidation IF-MoS2

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