Polyetheretherketone (PEEK) is gaining popularity in the biomedical field due to its excellent mechanical properties, chemical resistance and biocompatibility. Although PEEK is an excellent biomaterial, it may require bulk surface modification to tailor its properties for specific biomedical applications. In this study, the surface modification of PEEK was achieved by depositing titanium dioxide (TiO) by PVD method. The microstructure and mechanical properties of TiO coatings were studied by SEM/EDS and nanoindentation tests. Conventional scratch tests were performed to determine the adhesion and tribological properties of the TiO films. An in vitro study was performed in simulated body fluids to evaluate the osteocompatibility of TiO coated PEEK. According to the results The TiO coating has a dense microstructure and good adhesion, the critical cohesive load Lc is greater than 1N. The TiO film improved the mechanical properties of the PEEK substrate: hardness and elastic modulus increased from ∼0.33 to ∼4.03 GPa to ∼3.6 and ∼21.85 GPa, respectively. In addition, compared with the PEEK substrate, the coating showed a 61% improvement in wear resistance and a reduction in the coefficient of friction from 0.38 to 0.09. The results also showed that the TiO coating induces the formation of hydroxyapatite on the surface, which promotes the osteocompatibility of PEEK.
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