Abstract
To investigate the tribological performance of coating films formed by sputtering, polytetrafluoroethylene (PTFE) and polymide (PI) films were prepared on glass substrates. A sapphire ball 5 mm in diameter was slid on the films at a slow speed. The friction coefficients of these films did not depend on the load and film thickness. When the sliding was repeated on the same track, the friction of PTFE films increased as the number of passes increased. A large fluctuation in the friction was observed as the film wore away from the track. With PI films the friction coefficient was almost constant during the experiment. Using a pin-on-disk apparatus, the life of the films was estimated as the number of passes when the friction coefficient exceeded 0.5. Although almost all films were worn away from the track in relatively small passes, thin films left on the track were effective in suppressing the friction increase. PI film exhibited a much longer life than PTFE, although PI film exhibited a brittle fracture in contrast to PTFE film. Heat treating the films effectively increased the PTFE film life but decreased the PI film life.
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