Abstract
Shaft-surface contact friction pairs of marine equipment are often subject to the effects of wear and corrosion under cyclic loading in the seawater media. A friction and wear test bench was established to simulate the marine ship stern shaft and bearings working in seawater media. The tribological properties of pure polyphenylene sulfide (PPS), 30% glass fiber reinforced PPS (30% GF/PPS), and 30% carbon fiber reinforced PPS (30% CF/PPS) against 316L stainless steel under different lubrication conditions were investigated. The results show that the friction force and wear loss of three PPS materials against 316L stainless steel in seawater media are the smallest. Among them, carbon fiber reinforced polyphenylene sulfide has the lowest friction and wear under seawater lubrication. The friction fluctuates in the range of 5 N, and the wear is 0.028 g. Due to the inhomogeneity of glass fiber (GF) bonding with the PPS matrix, adding GF did not significantly improve PPS materials' antifriction properties and wear resistance. The wear mechanism is mainly the severe three-body abrasive wear caused by GF falling off on the surface of the friction pair. In addition, the resistance of carbon fiber to cyclic load, the mixed lubrication effect of seawater and carbon fiber debris, and the transfer effect of polymer were also discussed. The observation results show that carbon fiber can effectively resist the impact of cyclic load on the friction surface. There are synergistic anti-friction and wear-resisting effects between carbon fiber and seawater, seawater and polymer transfer film. This study will provide a reference for selecting new shaft friction pair materials under complex working conditions of seawater.