▎ 摘　　要

NOVELTY - A graphene-modified polyetheretherketone composite material comprises a composition including 67-89.7% polyetheretherketone, 0.1-1% graphene, 0.1-1% carbon nanotubes, 5-15% polytetrafluoroethylene with grain diameter of 20-35 mu m, 0.1-1% nano-silica with grain diameter of 20-50 nm and 5-15% para-polyphenol with grain diameter of 50-100 mu m, and has size distribution of 0.1-10 mu m, and thickness of 1 mu m. USE - Graphene-modified polyetheretherketone composite material used for forming rotor of ultrasonic motor. ADVANTAGE - The polyetheretherketone composite material can be manufactured by simple process and at low cost, and has excellent mechanical properties, temperature resistance, stable friction coefficient and low wear rate, even in high and low temperature and large load conditions, and can effectively improve the service life, and reliability of the ultrasonic motor. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of composite material, which involves ultrasonically stirring and mixing polyetheretherketone, graphene, carbon nanotubes, polytetrafluoroethylene, nano-silica, para-polyphenol in an ethanol solution, drying at 120 degrees C, and pulverizing and sieving with 200 mesh sieve, to obtain a composite powder, molding the composite powder by hot press sintering at 340-400 degrees C, and 5-10 MPa to obtain a polyetheretherketone composite material, naturally cooling the composite material for 1-2 hours, slicing, pasting, and surface-polishing the composite material.