Designing and examining polytetrafluoroethylene composites for tribotechnical purposes with activated ingredients

Berladir, Kristina; Sviderskiy, Valentin

doi:10.15587/1729-4061.2016.85095

Cited by 11 publications

(8 citation statements)

References 7 publications

(13 reference statements)

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“…PTFE powder was mechanically activated in a dry state in a high-speed mill MRP-1M under different operating modes (the number of revolutions of the working bodies of the mill varied in the range n  5000-9000 min -1 in time intervals   3, 5, 8 min) [17].…”

Section: Methodsmentioning

confidence: 99%

“…Phase and chemical analysis of activated PTFE was performed on an ARL 9900 WorkStation series X-ray fluorescence spectrometer with a built-in diffraction system. The method for studying the properties of the composite included the determination of density, the breaking strength, relative elongation at break, and wear rate according to standard procedures [17].…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the development of compositions and technology for the production of polymer composite materials based on PTFE requires a comprehensive approach that takes into account not only the characteristics of the original structure of the components [13], but also its transformation under the influence of technological and operational factors [14]. One of the most effective and low-cost ways to implement this approach to the formation of the structure of composites based on PTFE is the method of mechanical activation [15,16] and the introduction of fiber or/and dispersed fillers [17,18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanically Activated Polytetrafluoroethylene: Morphology and Supramolecular Structure

Berladir¹,

Hovorun²,

Rudenko³

et al. 2022

J. Nano- Electron. Phys.

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The nanoscale structure of polytetrafluoroethylene before and after mechanical activation was comprehensively studied by a set of modern physical research methods. The formation of a polydisperse mixture of a mechanically activated fluoropolymer with different molecular weights, the habit of single particles and arbitrary mass, size and morphology of cluster nanostructures was proved by electron microscopy. Two indicators were used to interpret the results of IR spectroscopy: the ratio of the intensities of the band maxima and the half absorption bandwidth. It was revealed that there is an increased concentration of CF2 end groups in the composition of activated polymer, which correspond to the low molecular weight fraction and provide small sizes of its macromolecules. It was proved that filling of polytetrafluoroethylene leads to a decrease in their number, contributing to the formation of a nanostructured polymer with fewer defects. It was established that the combined use of energy exposure and dispersed filler has a positive effect on the physical and mechanical properties of the fluoropolymer. The mechanical activation increases the strength level by 2.6 times and relative elongation by 4.3 times compared to the inactivated polymer; filling the activated polymer with sodium chloride increases the strength level by 2 times and relative elongation by 3.8 times.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanically Activated Polytetrafluoroethylene: Morphology and Supramolecular Structure

Berladir¹,

Hovorun²,

Rudenko³

et al. 2022

J. Nano- Electron. Phys.

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“…However, the introduction of small-sized fillers leads to an increase in the energy intensity of the mixing process, and, as a result, to an increase in the cost of the material obtained. One of the options to reduce the cost of PCM production is the application of mechanical activation in the air environment [8]. That has made it possible to reduce the wear intensity at some concentrations of the filler by 5...6 times.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determination of the influence of a filler on the properties of composite materials based on polytetrafluorothylene for tribosystems of mechanisms and machines

Dudin

Makarenko

Derkach

et al. 2021

EEJET

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This paper reports a comprehensive laboratory study into the thermophysical, physical-mechanical characteristics, and tribological properties of the designed composite materials based on polytetrafluoroethylene. In the structures of machines and mechanisms, a significant role belongs to the tribological conjugations made from polymeric and polymer-composite materials. The reliability of machines, in general, depends to a large extent on the reliability of movable connections. Composite materials of nonmetallic origin have a low cost, they are resistant to most aggressive chemicals and are capable of operating under conditions without lubrication. It was established that the characteristics and properties of materials must be adapted to the working conditions of separately considered tribological conjugations. The mechanisms of thermal destruction have been established, both in the basic material and the carbon fiber based on it. It was found that carbon fiber, regardless of its content (quantity) in the polymer-composite material based on polytetrafluoroethylene, is mainly oriented perpendicular to the force application plane. It was found that with an increase in the carbon fiber content from 10 to 40 % by weight, the heat capacity decreases by 16‒39 % compared to the main material. The optimal operating modes for the designed composite materials have been substantiated on the basis of a pv factor: under a dry friction mode – up to 4 MPa∙m/s; at friction with lubrication – up to 36.4 MPa∙m/s. The dependence has been established of the friction coefficient on the operating modes of a composite material based on polytetrafluoroethylene containing 20 % by weight of carbon fiber when lubricated with oil and water. The results reported here make it possible to synthesize the physical-mechanical characteristics and tribological properties of composite materials in accordance with the required modes of tribological conjugation.

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“…Due to the high viscosity of the melt, thermoplastic PTFE and compositions based on it cannot be processed into a product by worm extrusion or injection molding. Therefore, the methods of processing compositions based on PTFE into a composite are based on a two-stage process: obtaining a blank by pressing and subsequent heat treatment of the workpiece [ 15 ]. A special place in this plan belongs to the technology of pressing the composition into the workpiece, as the main operation of shaping the workpiece and structuring the composite [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Computer Simulation of Composite Materials Behavior under Pressing

et al. 2022

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Composite materials have a wide range of functional properties, which is ensured by using various technological methods of obtaining both the matrix or fillers and the composition as a whole. A special place belongs to the composition formation technology, which ensures the necessary structure and properties of the composite. In this work, a computer simulation was carried out to identify the main dependencies of the behavior of composite materials in the process of the main technological operations of their production: pressing and subsequent sintering. A polymer matrix randomly reinforced with two types of fillers: spherical and short cylindrical inclusions, was used to construct the finite element models of the structure of composites. The ANSYS Workbench package was used as a calculation simulation platform. The true stress–strain curves for tension, Poisson’s ratios, and ultimate stresses for composite materials were obtained using the finite element method based on the micromechanical approach at the first stage. These values were calculated based on the stretching diagrams of the matrix and fillers and the condition of the ideality of their joint operation. At the second stage, the processes of mechanical pressing of composite materials were modelled based on their elastic–plastic characteristics from the first stage. The result is an assessment of the accumulation of residual strains at the stage before sintering. The degree of increase in total strain capability of composite materials after sintering was shown.

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Designing and examining polytetrafluoroethylene composites for tribotechnical purposes with activated ingredients

Cited by 11 publications

References 7 publications

Mechanically Activated Polytetrafluoroethylene: Morphology and Supramolecular Structure

Mechanically Activated Polytetrafluoroethylene: Morphology and Supramolecular Structure

Determination of the influence of a filler on the properties of composite materials based on polytetrafluorothylene for tribosystems of mechanisms and machines

Computer Simulation of Composite Materials Behavior under Pressing

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