Study on wear and friction behavior of graphite flake-filled PTFE composites



The wear rate and coefficient of friction for graphite flake (GF)-filled polytetrafluoroethylene (PTFE) composites were evaluated on a pin-on-disk wear tester under dry conditions. Scanning electron microscopy showed significant reduction in the abrasive wear of the composites. The wear rates of 5 and 10 wt % GF composites were reduced by more than 22 and 245 times, respectively, at sliding speed of 1 m/s. With increasing sliding distance from 1 to 8 km, the wear rate of pure PTFE decreased by 1.4 times whereas that of composites, it decreased up to three times. The significant decreased in wear rate and coefficient of friction might be attributed to the formation of a thin and tenacious transfer film on the counter-surface. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013