The Tribotechnical Properties of Composites Based on Different Grades of Fluoroplastic-4 and Carbon Fibers

摘要

This paper reports on studies of tribotechnical behavior under conditions of friction without lubrication and the mechanical properties of fluoroplastic composites with discrete carbon fibers obtained from different grades of fluoroplastic-4 (F-4, PTFE). The particle size of PTFE powder and its mechanical properties influence the tribotechnical properties of composites with carbon fibers. The wear resistance and PV factor are higher and the friction coefficient is lower for the composite based on F-4 grade PN 90, whose powder particles are larger than the PTFE particles of the other studied grades. Composite made of modified fine-particle PTFE (grade TFM 1705) showed the highest modulus of elasticity and strength. It is assumed that large PTFE particles, which affect the mechanical properties of the composite negatively, contribute to a more intense formation of a transfer film during friction, and also reduce the contact area, which reduces the friction coefficient with increasing pressure in the friction zone.