Effects of ultrasound treatment of expanded graphite (EG) on the sliding friction, wear resistance, and related properties of PTFE-based composites containing EG

EG filler aggregates delaminate at friction into thinner platelets of nanographite which may accumulate in the friction surface layer of the composites. Accumulation of the filler is more expressed in highly wear resistant composites and has an additional effect on reduction of the wear rate.