Abstract: High wear resistance, low cytotoxicity and excellent antibacterial properties are the basis for osseointegration of implant materials. Polyetheretherketone (PEEK) has been considered as a potential implant material due to its excellent biocompatibility, natural radiolucency and mechanical properties. In this work, to improve the wear resistance, cytotoxicity and antibacterial properties of PEEK, carbon fber (CFR) and Black Phosphorus (BP) were used to synergistically modify PEEK by two methods, deposition of BP coating on CFR-PEEK and BP/CFR-PEEK coating on Ti6Al4V (TC4) through electrostatic spraying. After CFR and BP synergistically modifed PEEK, the friction coefcient of BP coating on CFR-PEEK and BP/CFR-PEEK coating were 0.14±0.01 and 0.09±0.02, respectively. The wear volume of BP coating on CFR-PEEK (30.54±1.32) was higher than that of BP/CFR-PEEK coating (9.46±1.32), which indicated that BP/CFR-PEEK coating showed high wear resistance. The diference in wear resistance may be caused by the fact that BP was not easily oxidized in BP/CFR-PEEK coating. In addition, BP coating on CFR-PEEK and BP/CFR-PEEK coating showed no obvious cytotoxicity to L929 cell and presented excellent antibacterial efciency (up to 94.5%±2.8% and 96.0%±3.8%, respectively) against Staphylococcus aureus (S. aureus). It was concluded that BP/CFR-PEEK coating exhibited high wear resistance, low cytotoxicity and excellent antibacterial properties against S. aureus, which might provide a foundation for osseointegration of implants.

Key words: Surface deposition, Electrostatic spraying, Wear resistance, Cytotoxicity, Antibacterial properties