| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === Titanium and its alloys are currently used as implant materials due to their good mechanical properties, high corrosion resistance and excellent biocompatibility. In this study, anodic oxidation in a Na2SO4¬, CA and Ca-GP solution has been employed to modify the structure and bioactivity of the biomedical Ti6Al4V alloy. The electrolyte solution allows for the production of bioactive titanium films to enhance its bone-forming function，hence increasing the efficacy of the orthopedic implant. After being treated with anodic oxidation treatment and soaked in simulated body fluid (SBF), the Ti6Al4V alloy was able to induce the formation of apatite on its surface. The films were investigated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), XRD and X-ray photoelectron spectrometer (XPS) to determine morphology and chemical composition of the surface layer and characterize structure, surface bonding and atomic composition before and after being soaked in SBF .
The results showed that anodic oxidation in a Na2SO4, CA and Ca-GP solution can be employed to produce crystalline titanium films on Ti6Al4V surfaces. which will then induce the formation of hydroxyapatite in simulated body fluid (SBF). Additionally, the hydroxyapatite-forming ability of the films obtained through anodic oxidation has been shown to increase with the increase of the concentration of Na2SO4 in the solution. The same increase resulted in an increase of porosity and number of pores and a decrease of their size. The average diameter of the pores is within 80nm～160nm. The electrolyte solution used was made of Na2SO4 and allowed for the formation of more and smaller holes, if compared with the solution without Na2SO4. As a consequence, the oxidation capacity of the solution with Na2SO4 resulted better than that of the solution without Na2SO4. After soaking the alloy in simulated body fluid (SBF), the presence of Na2SO4 in the solution was shown to induce a faster growth of hydroxyl-apatite on its surface. On the other hand, more time is required to induce the growth of hydroxyl-apatite if the solution does not contain Na2SO4. The hydroxyapatite film formed after soaking the alloy in SBF for 14 days was 5.78 μm thick. To conclude, the anodic oxidation in a Na2SO4¬, CA and Ca-GP solution can be seen as an effective way to prepare a bioactive Ti6Al4V alloy.
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