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Tribological properties of short carbon/PA/PTFE hybrid composites under dry sliding conditions

This article presents a study of the tribological properties of short carbon/polyamide (PA)/polytetrafluoroethylene hybrid composites. Their wear rate and the coefficient of friction were examined as a function of operating conditions (load and sliding distance) under dry and lubricated conditions. In addition, the hybrid composites with varying carbon to PA volume ratio were tested to assess hybrid effects. It was found that the friction and wear rate decreased with sliding distance and then leveled off under dry sliding conditions. Different changing patterns with normal load were observed under dry sliding conditions. Furthermore, it was noted that the hybrid effects on the wear resistance and the friction coefficient were identified for the current hybrid system. The composite with a carbon fiber content of 30 vol% was found to have the least wear and friction among all hybrid composites studied. Worn surfaces were observed by scanning electron microscope and wear mechanisms were discussed in this study.