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Tribological Performance of Si3N4-PTFE Composites Prepared by High-Pressure Compression Molding

Abstract The tribological performance of ceramic–polymer composites prepared by high-pressure (3 GPa) compression molding of silicon nitride (Si3N4) and polytetrafluoroethylene (PTFE) with epoxy resin (EP) binder was investigated under dry friction conditions. Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy, and energy-dispersive spectroscopy (EDS) were utilized to characterize Si3N4-PTFE-EP composites. The Vickers hardness and shore hardness were tested and the thermal stability was evaluated by thermogravimetric analysis (TGA). The results indicate that the lowest wear rate reaches 10−7 mm3 (Nm)−1 and the lowest friction coefficient is about 0.06. With an increase in the PTFE mass fraction, the main wear form gradually changes from abrasive wear to adhesive wear, but fatigue wear always exists.