Effect on composite tribological properties of different fillers and methods for introduction into polytetrafluoroethylene

Abstract

The effect of methods for introducing different fillers on the structure and tribological properties of composites based on fluoroplastic is studied. It is established that the maximum distribution uniformity for finely-dispersed fillers of different nature in composites is provided by use of a fluoroplastic base in the form of a suspension. The effect of counterbody material on wear resistance and friction coefficient of pure and filled fluoroplastic is studied. It is established that the greatest wear resistance is exhibited by fluoroplastic filled with carbon fibers in a friction pair with counterbodies made of titanium and stainless steel. It is shown that with friction for aluminium and its alloy D16T in a pair with pure fluoroplastic there is catastrophic wear for both the polymer and the metal counterbody. A considerable improvement in the wear resistance of this pair is achieved by introducing finely-dispersed graphite into the fluoroplastic matrix.

Adhesive and tribological properties of fluoroplastic materials in contact with different metal surfaces

“…The insignificant decrease in the tear strength of pure fluoroplastic is probably due to some texturing of macromolecules in the surface layers of the polymer. Steel 45 10 15 25 40 85 105 165 215 Steel Kh18N19T 5 15 25 45 80 118 160 195 Copper 30 40 85 95 120 145 215 380 Titanium alloy PT-7M 5 20 30 85 125 180 225 270 The effect the counterface material has on the friction coefficient and wear of pure and reinforced fluoroplastic at a constant sliding speed of 0.5 m/sec and under a constant pressure of 1 MPa is examined in [2]. This allowed us to identify the best friction pair with optimal tribotechnical properties.…”