Friction and Wear Properties of Different Fibers Reinforced and Different Solid Lubricants Modified PTFE Composites

Polytetrafluoroethylene (PTFE) composites with different formulas were prepared with carbon fiber or glass fiber as reinforcing fibers and molybdenum disulfide (MoS₂) or graphite as solid lubricants. Friction and wear tests under dry friction and oil lubrication conditions was conducted on the composites, the wear morphology of composites was observed, and the influence of different reinforcing fibers and solid lubricants on friction and wear properties of composites was analyzed. The results show that under dry friction condition, when modified with the same solid lubricant, the carbon fiber reinforced PTFE composite had a smaller wear scar width and a larger friction coefficient than that reinforced with glass fiber; with the same reinforcing fiber, MoS₂ modified PTFE composite had a smaller scar width and a larger friction coefficient than the graphite modified PTFE composite. Under oil lubrication condition, when modified with the same solid lubricant, the wear scar width of carbon fiber reinforced PTFE composite was smaller than that of glass fiber reinforced PTFE composite, and the friction coefficient was larger; when the reinforcing fiber was the same, the wear scar width of MoS₂ modified PTFE composite was slightly smaller and the friction coefficient was larger than that of graphite modified PTFE composite.