| Summary: | 碩士 === 龍華科技大學 === 化工與材料工程系碩士班 === 107 === The substrates of titanium or titanium alloy are widely used in biomaterials as they own the characteristics of excellent biocompatibility, high mechanical strength, abrasion resistance and chemical stability. However, further application and development of these titanium alloys are retarded by the obstacles of weak bonding strength, defective bioactivity and long healing duration.
Therefore, the micro-arc oxidation treatment of titanium or titanium alloy in an electrolyte containing calcium, phosphorus ion or hydroxyapatite particles to form a biological-activity titanium oxidation ceramic coating on the surface of titanium or titanium alloy has won considerable notices. These ceramic coatings can induce cell growth and increase the biological activity of titanium or titanium alloy, in addition to improving surface hardness and corrosion resistance.
In this thesis, a thorough review of the research results and the progress of bioactive calcium-phosphorus compound or hydroxyapatite oxide coating on the surface of titanium or titanium alloy by micro-arc oxidation technology are made and the theoretical basis and operating parameters of micro-arc oxidation of titanium or titanium alloy are summarized. Furthermore, the problems that have not been solved in the current research and the suggestions for improvement are proposed for the future studies in this field.
Additionally, in this thesis, a hydroxyapatite (HA) powder was added to the electrolyte to fabricate a porous ceramic coating (HA/Ti) containing HA on the surface of the titanium alloy (Ti-6A1-4V) by micro-arc oxidation. The results show that the surface hardness of the HA/Ti coating on the titanium alloy can be as high as 1400~1500Hv (the hardness of the titanium alloy substrate is 400Hv), and the corrosion resistance is also 1000 times better than that of the titanium alloy substrate.
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