Barhoumi Najoua, Khlifi Kaouther, Attia-Essaies Sameh
Laboratory of Mechanics, Materials and Processes, National High School of Engineering of Tunis (ENSIT), 5, Rue Taha Hussein, Montfleury, 1008, Tunis Bab Alleoua, Tunis, Tunisia; Preparatory Institute for Engineering Studies - El-Manar, University of El-Manar, B.P 244, Tunis, 2092, Tunisia.
Laboratory of Mechanics, Materials and Processes, National High School of Engineering of Tunis (ENSIT), 5, Rue Taha Hussein, Montfleury, 1008, Tunis Bab Alleoua, Tunis, Tunisia; Preparatory Institute for Engineering Studies - El-Manar, University of El-Manar, B.P 244, Tunis, 2092, Tunisia.
J Mech Behav Biomed Mater. 2023 Aug;144:105935. doi: 10.1016/j.jmbbm.2023.105935. Epub 2023 May 29.
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.
聚醚醚酮（PEEK）因其优异的机械性能、耐化学性和生物相容性，在生物医学领域越来越受欢迎。尽管PEEK是一种优异的生物材料，但可能需要进行整体表面改性，以针对特定的生物医学应用调整其性能。在本研究中，通过物理气相沉积（PVD）法沉积二氧化钛（TiO₂）实现了PEEK的表面改性。通过扫描电子显微镜/能谱仪（SEM/EDS）和纳米压痕试验研究了TiO₂涂层的微观结构和机械性能。进行了常规划痕试验，以确定TiO₂薄膜的附着力和摩擦学性能。在模拟体液中进行了体外研究，以评估TiO₂涂层PEEK的骨相容性。根据结果，TiO₂涂层具有致密的微观结构和良好的附着力，临界内聚载荷Lc大于1N。TiO₂薄膜改善了PEEK基体的机械性能：硬度和弹性模量分别从约0.33 GPa和约3.6 GPa增加到约4.03 GPa和约21.85 GPa。此外，与PEEK基体相比，涂层的耐磨性提高了61%，摩擦系数从0.38降低到0.09。结果还表明，TiO₂涂层诱导表面形成羟基磷灰石，从而促进了PEEK的骨相容性。
