Abstract
Three carbons of differing aspect ratios were incorporated into a matrix of PTFE. Experiments were conducted to investigate the behaviour of the differing particle shapes on the friction and wear characteristics of the composites. The wear tests were conducted at a sliding velocity of 300 m min −1 and at a load of 4 kgf which corresponded to a nominal contact pressure of 2.5 × 10 5 Pa. The counterface was mild steel with a mean roughness of 0.02 μm c.l.a. and the bulk temperature of the counterface was maintained at 21 °C. The tests were conducted in air. In all cases incorporation of the graphite filler reduced the wear rate of the composite, the polar and nuclear forms being more beneficial at the same wt.% levels than the oleophilic form of graphite. It was found that an optimum filler content existed for all the carbon systems studied, above and below which the wear rate of the specimens increased.
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