Polytetrafluoroethylene-based polymeric composite materials intended for triboengineering applications

Охлопкова, А. А.; Петрова, П. Н.; Попов, С. Н.; Sleptsova, S. A.

doi:10.1134/s1070363209030505

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…A significant improvement in wear resistance was already achieved at 2 wt.%. In previous works [ 32 , 33 ], the filling up to 2 wt.% was defined as the “first critical concentration” when filling PTFE with nanosized ceramics. In this work, the statement is also valid in the case of filling with layered silicates.…”

Section: Resultsmentioning

confidence: 99%

Morphology Analysis of Friction Surfaces of Composites Based on PTFE and Layered Silicates

et al. 2022

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In the present study, the tribological behavior of polytetrafluoroethylene (PTFE) composites filled with natural layered silicates (LS) was investigated. The change in the morphology of the friction surface of composites depending on the content and chemical composition of layered silicates has been shown. The friction surface of PTFE composites with layered silicates was investigated by scanning electron microscopy (SEM). The formation on the friction surface of a special layer with a structure different from the bulk of the polymer, which is formed from particles of fillers and wear products, has been established. The thickness of this layer is independent of the content of layered silicates in the polymer. It was indicated that wear debris of PTFE composites was assembled during friction and uniformly cover the friction surface layer by layer, thereby forming a protective layer.

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Section: Resultsmentioning

confidence: 99%

Morphology Analysis of Friction Surfaces of Composites Based on PTFE and Layered Silicates

et al. 2022

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“…The idea of adding fillers to polymers in order to improve their physico-mechanical properties has been successful for many decades since a virgin (single) polymeric material generally does not possess the right set of properties to be used for particular applications. Currently, improvement of physico-mechanical and tribological properties of polymeric materials by incorporation of small amounts of various micro/nano solid particles (carbides, borides, nitrides, oxides and carbon nano-forms) into the polymer matrix is well known [1][2][3][4][5][6][7][8]. It is also known that the Polytetrafluorethylene (PTFE), as a tribotechnical material, is a unique among the existing polymers, as a solid body having the lowest coefficient of friction (0.05÷0.1) at temperatures up to 300˚C, and which is distinguished by its lowest ratio of surface shear strength to volume shear strength (s/τ = 0.2).…”

Section: Introductionmentioning

confidence: 99%

Investigation of new antifrictional/frictional nanocomposites based on PTFE matrix filled with Fe-doped carbon nanoparticles

Kutelia¹,

Gventsadze²,

Tsurtsumia³

et al. 2018

Adv. Mater. Lett.

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The present work is dealing with the study of a nano-compositional material which was obtained on the basis of PTFE with 2.5÷10wt% of core-shell type Fe-doped carbon nano-tubes and carbon nano-particles as fillers. The PTFE samples without the fillers were prepared too. Weight wear, friction coefficient and temperature were measured after passing some velocity steps, and afterwards the linear wear was calculated. The obtained results have shown that the incorporation of about 2,5÷5wt% of Fe-doped CNTs into PTFE matrix drastically improves the antifrictional properties in comparison to the unfilled PTFE. Namely, the wear resistance of these nanocompositions increased by the factor of 500-150 in the range of friction velocities 0.25÷1.25 m/sec. Increase of the filler portion up to 10wt% transforms the obtained nanocomposite from antifrictional to friction material with the enhanced coefficient of friction up to 0.32, but with the unexpectedly ultra-low wear. SEM-EDX analyses of the worn surfaces of the tested nanocomposites and the cast iron samples after working as a tribological pair, revealed some favorable effects of the Fe-doped CNTs filler on the formation mechanism of a transfer film and its role in promoting very low wear of the obtained new nanocomposites.

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“…Certain improvement in PTFE mechanical properties can be achieved by means of the introduction of solid microparticles as graphite, coke, oxides, carbon and glass fibers, etc. []. This may be got under the condition of homogeneous mixing of the well‐dispersed agglomerates of microparticles.…”

Section: Introductionmentioning

confidence: 99%

Processing and structural properties of in situ polymerized poly(tetrafluoroethylene)/graphite fluoride composites

Mel’nikov

Addiego²,

Смірнов

et al. 2013

Polymer Engineering & Sci

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Polytetrafluoroethylene-based polymeric composite materials intended for triboengineering applications

Cited by 6 publications

References 3 publications

Morphology Analysis of Friction Surfaces of Composites Based on PTFE and Layered Silicates

Morphology Analysis of Friction Surfaces of Composites Based on PTFE and Layered Silicates

Investigation of new antifrictional/frictional nanocomposites based on PTFE matrix filled with Fe-doped carbon nanoparticles

Processing and structural properties of in situ polymerized poly(tetrafluoroethylene)/graphite fluoride composites

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