In vitro Bioactivity, Bio-Corrosion Resistance and Antibacterial Property of Laser Cladded HA Coatings with Different Content of ZnO on Ti-6Al-4V Substrate

HA/ZnO coatings with varying content of ZnO were fabricated on Ti-6Al-4V substrate to enhance its bioactivity and antibacterial ability. The main phases are identified as CaTiO3, Ca3(PO4)2, ZnTiO3 and CaO. The coatings with higher ZnO content presented smaller grain size, resulting in a higher surface free energy and better wettability. Consequently, the mineralization of the ZnO/HA coatings, especially for the higher ZnO content samples were improved, indicating better enhanced in vitro bioactivity. The ZnO-HA coated Ti-6Al-4V presented better corrosion resistance than bare Ti-6Al-4V substrate. Furthermore, better corrosion resistance was obtained by increasing ZnO content in the precursor. The antimicrobial ratio of all coatings was approximately 100%, indicating the ZnO doped HA coatings presented excellent antibacterial ability.

在Ti-6Al-4V钛合金基底上制备了氧化锌（Zinc Oxide，ZnO）含量各异的羟基磷灰石（Hydroxyapatite，HA）/ZnO复合涂层，以提升其生物活性与抗菌性能。经表征鉴定，涂层的主要物相为钛酸钙（CaTiO₃）、磷酸钙（Ca₃(PO₄)₂）、钛酸锌（ZnTiO₃）以及氧化钙（CaO）。氧化锌含量更高的涂层晶粒尺寸更小，由此具备更高的表面自由能与更优异的润湿性。因此，HA/ZnO复合涂层的矿化性能得到提升，尤其是氧化锌含量较高的试样，其体外生物活性得到进一步增强。经ZnO-HA涂层修饰的Ti-6Al-4V钛合金，其耐蚀性能优于未涂层的原始Ti-6Al-4V基底。此外，前驱体中氧化锌含量越高，涂层的耐蚀性能越佳。所有涂层的抗菌率均接近100%，表明掺氧化锌的HA涂层具备极佳的抗菌性能。