Quantitative characterization of solid lubricant transfer film quality

Ye, J.; Khare, H. S.; Burris, David L.

doi:10.1016/j.wear.2014.04.017

Cited by 70 publications

(34 citation statements)

References 35 publications

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“…Similarly, transfer film coverage did not correlate to the wear rate of the polyethylene terephthalate (PET) nanocomposites [41]. Ye et al [21] proposed that the polymer interacts more strongly with regions of exposed counterface and that the size of these uncovered regions should be a quantitative predictor of future debris size. Since the wear volume is proportional to the amount of debris and the cube of the debris size [43], the wear rate should be more sensitive to the characteristic size of the uncovered areas than the uncovered area fraction (Figure 4).…”

Section: Transfer Film Morphologymentioning

confidence: 99%

“…The authors defined the free-space length as the characteristic size of the uncovered areas and developed a method to quantify this metric. The method is based on the iteration of a fixed-size overlaying box pixel-counting algorithm as explained in detail in [21]. The free-space length for representative images of the run-in, transition, and steady state transfer films of low-wear alumina-PTFE nanocomposites are represented by the length of the associated red boxes in Figure 5a.…”

Section: Transfer Film Morphologymentioning

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 Film Morphologymentioning

confidence: 99%

Section: Transfer Film Morphologymentioning

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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“…The filler, alpha-phase Al 2 O 3 nanoparticles, is from Nanostructured & Amorphous Materials Inc. and has a reported particle size of 27-43 nm. This particular combination of materials has been the subject of several studies showing ultra-low wear behavior of the nanocomposite under ambient environments 11,18,[25][26][27][28][29] . Alumina nanoparticles (0.5 g) were added to the PTFE resin (9.5 g) in a…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

Interrelated Effects of Temperature and Environment on Wear and Tribochemistry of an Ultralow Wear PTFE Composite

et al. 2015

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A particular alumina-PTFE nanocomposite has distinguished itself with unusually large wear reductions at trace filler loadings. Recent studies have shown that the formation of carboxylic acid end groups in humid environments is a critical part of the wear reduction mechanism. This finding has significant implications for the utility of the material for space and high temperature applications. In this paper, wear rate, morphology, composition and chemistry of the wear surfaces were characterized as a function of environmental composition and surface temperature to better understand the environmental limitations of this solid lubricating system and the associated wear resistance mechanisms. The following results were found: (1) ultra-low wear rates were retained with increasing interface temperature up to 100°C, (2) carboxylates were

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“…Thus, the tribological tests of the developed new composite materials (PTFE + chalcopyrite particles), and the analysis of the SEM-EDX results on the worn surfaces of the tribo-pairs show that under concrete conditions of load and speed of sliding, the transfer films [3,4] create an equivalent of lubricating effect in tribo-pair.…”

Section: Methodsmentioning

confidence: 99%

“…Clearly, despite the type of the polymer, the very important role in the formation of friction properties of the transfer film play the nature of the filler particles introduced into the polymer matrix, their composition, shape, dimensions, physicochemical properties, distribution in the volume as well as the degree of compatibility with the matrix [3][4].…”

Section: Introductionmentioning

confidence: 99%

The Tribological Properties of Ptfe Modified With Chalcopyrite

Gventsadze¹,

Kutelia

Nadaraia

et al. 2017

Proccedings of International Scientific Conference "BALTTRIB 2017"

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In present work it has been studied the physical-mechanical and tribological properties of the compositional material which was obtained in the PTFE base with chalcopyrite fine dispersed concentrate as fillers. The PTFE-chalcopyrite composites were prepared by powder metallurgy route containing chalcopyrite particles (2.5, 5 and 10 wt %). The tests have been performed in the friction machine under 0.7 MPa load where as a counterpart the gray cast iron was used. From the beginning, the weight wear was measured after passing some velocity steps (0.25-1.25 m/sec). The worn surfaces of the tested composites and the cast iron samples after working as a tribological pair were analyzed using SEM/EDX methods. The obtained results have shown that the incorporation of optimal quantity (~5 wt %) chalcopyrite particles into PTFE matrix drastically (>10 2 times) improves the wear resistance comparatively to the unfilled PTFE in the 0.25-1.25 m/sec friction velocity range. In the same testing conditions by the analysis of the obtained results it is determined that at the low velocity friction (<1 m/sec) the newly developed composite material has 10-15 times lower wear intensity than the best existing tribo-technical purpose commercial material "superfluvis", therefore the obtained composite can be considered as a quite inexpensive and efficient tribological material.

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Quantitative characterization of solid lubricant transfer film quality

Cited by 70 publications

References 35 publications

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

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

Interrelated Effects of Temperature and Environment on Wear and Tribochemistry of an Ultralow Wear PTFE Composite

The Tribological Properties of Ptfe Modified With Chalcopyrite

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