STUDY OF THE INFLUENCE OF CARBON AND BASALT FIBERS WITH ULTRADISPERSE PTFE ON THE TRIBOLOGICAL PROPERTIES OF POLYTETRAFLUOROETHYLENE

A.P. Vasilev, T.S. Struchkova, A.A. Okhlopkova, A.G. Alekseev
DOI: 10.25699/SSSB.2020.29.56932 Download PDF
Abstract: In this paper, we studied the effect of combining carbon and basalt fibers with UPTFE on the mechanical and tribological properties of PTFE. It is shown that the introduction of combined fibrous fillers with UPTFE in PTFE leads to an increase in compressive stress and elastic modulus. In the case of composites with mechanical activation of basalt fiber, the compression modulus is maintained at the level of the initial polymer. Structural studies showed that with the introduction of fillers, the degree of crystallinity of the composites increased, the density of the composites decreased relative to unfilled PTFE. The results of the study of tribological tests of polymer composite materials filled with carbon fibers and combined fibers with UPTFE are presented. It has been shown that the wear resistance of composites increases significantly compared to the initial PTFE while maintaining a low coefficient of friction. A comparative analysis of the composites showed that composites with mechanical activation of basalt fiber have a wear resistance higher than the starting polymer by 800 times and to 2-time relative PTFE filled with carbon fibers. The wear resistance of composites with mechanical activation of basalt fiber is 20–25% higher relative to samples with combined fillers without mechanical activation. Microscopic studies have shown that the main factor in improving the wear resistance of composites is the formation by strong fibers of obstacles to the deformation and displacement of local areas of the polymer matrix under the action of shear stresses. It is shown that the high wear resistance of composites with mechanical activation of basalt fiber relative to other samples is possibly due to the formation of wear-resistant secondary structures on the worn surface.
Index terms: PTFE, carbon fibers, basalt fibers, PCM, wear resistance.

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