Transfer Film Tenacity: A Case Study Using Ultra-Low-Wear Alumina–PTFE

Ye, J.; Moore, Axel C.; Burris, David L.

doi:10.1007/s11249-015-0576-4

Cited by 53 publications

(24 citation statements)

References 34 publications

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“…Unfortunately, it is difficult to completely rule out the potentially confounding effects of the bonding agent. In an effort to remove the bonded material from the measurement, Ye et al [22] used thin film failure theory from Agrawal and Raj [68,69] to measure adhesive strength. Although this method eliminates the need for a second bonded interface, it provides the adhesive shear strength relative to the tensile strength of the film, which is unknown.…”

Section: Adhesion Of the Transfer Filmmentioning

confidence: 99%

“…To better understand the potential effects of factors like contact pressure, shear stress, and friction coefficient on the wear rate of the film, Ye et al [22] measured the wear rate of alumina-PTFE transfer film as a function of the spherical counterface material. As shown in Figure 9a, the wear rate of the same steady state film varied by five orders of magnitude by simply changing the counterface material.…”

Section: Adhesion Of the Transfer Filmmentioning

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: Adhesion Of the Transfer Filmmentioning

confidence: 99%

Section: Adhesion 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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“…This phenomenon is called material transfer, which forms the transfer layer as a result. (25) The condition of the transfer layer directly affects the tribological properties of the entire system. During the run-in period, a great amount of wear will be produced, but the wear will gradually decrease when the transfer layer formed (transition period) and well-covered (steady state) the object surface.…”

Section: Resultsmentioning

confidence: 99%

“…(26) After effectively adhering to or covering the objects in contact, the transfer layer material can provide a self-lubrication effect, which is one of the main mechanisms responsible for the considerable reduction in frictional resistance. (16,25,27) As shown in Fig. 3, only the tribological properties during the run-in and transition periods are discussed.…”

Section: Resultsmentioning

confidence: 99%

Parameter Effect on Tribology Performance of Biopolymer Composite Green Lubricant

2017

Sensors and Materials

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In this paper, the effects of loading capacity and sliding speed on the tribology properties of composite films formed by a high-concentration MoS 2 additive and the biopolymer hydroxypropyl methylcellulose (HPMC) are demonstrated. The main mechanisms that affect the coefficient of friction are the real contact area and the formation of the transfer layer. Reducing the real contact area will decrease the overall coefficient of friction, while the formation of the transfer layer is a dominant factor for high-load and high-sliding-speed conditions, which results in a stable coefficient of friction. The self-lubrication phenomenon occurring after the formation of the transfer layer is mostly responsible for the excellent tribology properties of the MoS 2 /HPMC composite material.

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“…In the past decade, the wear rate of PTFE has been reduced by 1,000 to 10,000 times with the inclusion of 1-10 wt. % of certain -phase alumina particulate fillers [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. As the mysterious synergistic mechanisms for this wear reduction have been more recently uncovered, the importance of tribochemistry [8, 10-12, 17, 21], tribofilm formation [9,[18][19][20]22], multi-scale mechanics [13,17,23], environmental and sliding conditions [8,10,12], countersample roughness [16,24,25] and numerous other system phenomena/parameters has been highlighted.…”

Section: Introductionmentioning

confidence: 99%