Sliding wear mechanism of polytetrafluoroethylene (PTFE) and PTFE composites

Blanchet, Thierry A.; Kennedy, Francis E.

doi:10.1016/0043-1648(92)90271-9

Cited by 310 publications

(185 citation statements)

References 36 publications

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“…The transfer film contains discernable patches of 100 µm length scale (Figure 2b). The fillers have clearly reduced debris size, improved the transfer film and reduced wear by comparison to unfilled PTFE whose transfer films contain platelets on the 1-5 mm size scale [6,31,32]. However, the 80 nm α phase alumina filled PTFE was more than 100ˆmore wear resistant under the same conditions.…”

Section: Transfer Films and Their Link To Low Wearmentioning

confidence: 96%

“…Low friction, it turns out, is due to easy shear between PTFE lamellae or fibrils, not poor adhesion to the opposing surface, as originally thought [4]. Unfortunately, however, the same attributes that yield low friction also enable subsurface cracks to easily propagate, which results in large, plate-like debris, poorly adhered transfer films, and unacceptably high wear rates (K~10´3 mm 3 /Nm) at speeds greater than~10 mm/s [4,6].…”

Section: Introductionmentioning

confidence: 99%

“…Early on, the wear-mitigating effect of these particles was attributed to preferential support of the normal load by the filler and disruption of subsurface crack propagation [6,12]. In each case, significant wear reductions accompanied smaller wear debris and thinner, more complete, and seemingly adherent transfer films.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…Incorporation of micro-scaled fillers has been shown to reduce wear rates of PTFE typically bỹ 100ˆwith >20 wt % filler loading [3,[6][7][8][9][10][11]. Early on, the wear-mitigating effect of these particles was attributed to preferential support of the normal load by the filler and disruption of subsurface crack propagation [6,12].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Transfer Films and Their Link To Low Wearmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Chemistry Of the Transfer Filmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Burris

Xie

2016

Lubricants

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Friction, Lubrication, and Wear

Butt

Graf

Kappl

2003

Physics and Chemistry of Interfaces

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Friction is the force between interacting surfaces that resists or hinders their relative movement. Wear is defined as the progressive loss of material from a body caused by contact and relative movement of a contacting solid, liquid or gas. The aim of lubrication is to reduce friction between surfaces and minimize wear. Today the research field of friction, lubrication and wear is called "tribology". This word is derived from the ancient Greek word "tribein" (meaning rubbing) and was first used in 1966 in a publication titled, The Jost Report: Lubrication (Tribology) Education and Research published by Her Majesty's Stationery Office (HMSO) in the United Kingdom. Since then it became the common term to describe the science of friction, wear, and lubrication. Introductions to this field are Refs. [452, 453].In spite of the strong economic importance of friction and wear and the resulting scientific effort, our understanding of the fundamental processes is still rudimentary. This results from the complexity of these topics. In addition, this complexity demands a multi-disciplinary approach to tribology. In recent years the development of new experimental methods such as the surface forces apparatus, the atomic force microscope, and the quartz microbalance made it possible to study friction and lubrication at the molecular scale. However, this new wealth of information does not alter the fact, that there are no fundamental equations to describe wear or calculate friction coefficients. Engineers still have to rely largely on their empirical knowledge and their extensive experience.

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