Strength characteristics, structure and wear resistance of ptfe-commercial carbon composites

Aderikha, V. N.; Шаповалов, В. А.; Pleskachevskii, Yu. M.

doi:10.3103/s1068366608020074

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…Though PTFE can easily be electrified, the high electrical conductivity of carbon fibers prevents us from realizing electrostatic mechanisms of interfacial interaction. These problems are common to most materials which could be potentially used as PTFE reinforcement, which results in a unique phenomenon: in contrast to any other polymers, PTFE filling by almost any material reduces the composite tensile strength as compared to the source polymer [2][3][4][5][6]. The strength decrease was reported to linearly depend on the filler content [7], in agreement with the mixture rule.…”

Section: Introductionmentioning

confidence: 56%

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A Fluoropolymer Coating on Carbon Fibers Improves Their Adhesive Interaction with PTFE Matrix

Shelestova

Гракович

Zhandarov

2011

Composite Interfaces

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Carbon fibers were treated in a HF glow discharge in tetrafluoroethylene and octafluorocyclobutane in order to improve their adhesion to poly(tetrafluoroethylene) matrix. As the result of the plasma treatment, a thin (20-140 nm) fluoropolymer coating was deposited onto the fiber surface. The structure of this coating was studied by means of IR spectroscopy, XPS, AFM and SEM techniques. The coating material appeared to be similar to PTFE in its chemical composition but distinguished by branched, partially crosslinked, amorphous structure and included unsaturated chemical bonds. The coating thickness of 70 nm was sufficient to effectively screen the field of molecular forces of the initial substrate, thus, decreasing the surface energy of the fibers and improving their compatibility with the PTFE matrix. The adhesive strength in the PTFE-carbon fiber systems, measured by means of the microbond test, more than doubled upon the plasma treatment (the local interfacial shear strength increased from 10.7 to 29.7 MPa, apparent IFSS from 4.3 to 7.8 MPa), and the interfacial frictional stress increased by 70%. The new composite material consisting of 20% short coated carbon fibers in the PTFE matrix showed better mechanical, thermal and tribological characteristics as compared with the composite reinforced with untreated fibers.

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Section: Introductionmentioning

confidence: 56%

“…Infrared spectra of 5 µm thick PTFE film (1) and plasma-chemically deposited fluoropolymer coating on KBr(2).…”

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confidence: 99%

A Fluoropolymer Coating on Carbon Fibers Improves Their Adhesive Interaction with PTFE Matrix

Shelestova

Гракович

Zhandarov

2011

Composite Interfaces

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“…As also mentioned in literature (Aderikha et al, 2008;Friedrich et al, 2002;Xu et al, 2006;Yang et al, 2009), a percentage of 20 per cent GF could be the optimum for a tribological application, not only for a PTFE matrix, as the fibers are sufficient to avoid the tearing-off of the polymer, but also not in excess to make the tribolayer too rigid and subjected to detach hard and big agglomerations; thus, the water film is generated as proposed by Spikes, 1987 andvan Ostayen et al, 2009). The graphite helps maintaining a low friction coefficient at lower sliding speeds when the water film is only partial or plays only the part of a cooling agent (Clarke and Allen, 1991;Yamamoto and Hashimoto, 2004).…”

Section: The Friction Coefficient Under Water Lubricationmentioning

confidence: 89%

Water lubrication of PTFE composites

Deleanu

Georgescu

2015

Industrial Lubrication and Tribology

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Purpose -The paper aims to present results on the friction and the wear of polytetrafluoroethylene (PTFE) and eight commercially available composites with PTFE matrix, for tests done on shoe/roller tribotester with water lubrication in open circuit. There are pointed out particular tribological processes within the superficial layers of the composites with the help of optical microscopy. Design/methodology/approach -Analysing the tribological behaviour of eight grades of PTFE composites sliding in water on shoe/roller tribotester. Findings -Good results of wear behaviour under water lubrication for all the composites. PTFE exhibits severe wear under the tested regime. Originality/value -The research could support PTFE composite application for water lubricated systems.

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“…48 In Figure 8 are shown the SEM images of PTFE and its composites with various loadings of carbon material. 56 The split surface of the composite is heterogeneous at a 1 wt % of commercial carbon (Figure 8(b)). The structure contains lamellas in the same direction as in the initial PTFE (Figure 8(a)) and irregular polygons corresponding to spherulitic supramolecular structures (SPS).…”

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confidence: 99%

“…Therefore, the friction and wear behaviors of filled PTFE have been extensively investigated. 38 For example, Cheng, Xue, and Xie studied the effect of glass fibers on the tribological performance of PTFE-based nanocomposites.…”

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confidence: 99%

Nanocomposites Based on Polytetrafluoroethylene and Ultrahigh Molecular Weight Polyethylene: A Brief Review

Kirillina¹,

Никифоров²,

Охлопкова³

et al. 2014

Bulletin of the Korean Chemical Society

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Deficiencies in wear and frost resistance as well as mechanical strength constitute the main causes of equipment failure under the harsh climatic conditions of the Earth's polar regions. To improve the properties of the materials used in this equipment, nanoparticle composites have been prepared from clays such as kaolinite, hectorite, and montmorillonite in combination with polytetrafluoroethylene (PTFE) or ultrahigh molecular weight polyethylene (UHMWPE). A number of techniques have been proposed to disperse silicate particles in PTFE or UHMWPE polymer matrices, and several successful processes have even been widely applied. Polymer nanocomposites that exhibit enhanced mechanical and thermal properties are promising materials for replacing metals and glass in the equipment intended for Arctic use. In this article, we will review PTFE-and UHMWPE-based layered silicate nanocomposites.

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Strength characteristics, structure and wear resistance of ptfe-commercial carbon composites

Cited by 13 publications

References 14 publications

A Fluoropolymer Coating on Carbon Fibers Improves Their Adhesive Interaction with PTFE Matrix

A Fluoropolymer Coating on Carbon Fibers Improves Their Adhesive Interaction with PTFE Matrix

Water lubrication of PTFE composites

Nanocomposites Based on Polytetrafluoroethylene and Ultrahigh Molecular Weight Polyethylene: A Brief Review

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