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URN etd-0913110-073045 Statistics This thesis had been viewed 3243 times. Download 1041 times. Author Sheng-Long Hsieh Author's Email Address No Public. Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 119 Title Deposition of high adhesion and biological activity coating on titanium substrate by bipolar pulse micro-arc oxidation and hydrothermal method Keyword biological activity adhesion bipolar pulse titanium hydroxyapatite hydrothermal micro-arc oxidation micro-arc oxidation hydrothermal hydroxyapatite titanium bipolar pulse adhesion biological activity Abstract In the experimental process, contains calcium and phosphorus of oxide ceramic coating on titanium substrate produced by pulsed bipolar micro-arc oxidation process. The oxide ceramic consisted of anatase and rutile,and the thickness of the film was 3~15μm.Hydroxyapatite crystallization is forming on surface of the oxide film prepared by hydrothermal, consult of oxide layer are porous, rough, high adhesion and biological activity.
It was found in the constant voltage mode, use high voltage to generate a higher adhesion of the film. The maximum adhesion over 54MPa, observe to side of the film is exactlly compact of structure. And adhesion is lower than 40MPa of film generally there are a lot of cavities and defects.
Increased of thinkness,roughness,diameter of pores , calcium content, and Ca/P of the film by increasing of duty ratio, also can promote the formation of high-temperature phase. Because increased of Ca/P,hydroxyapatite coating film become excellent with hydrothermal. If the high voltage and high concentrations of calcium acetate for oxidation, raising the duty cycle will produce a number of surface pits. This phenomenon is the better of surface wettability, with increasing the duty cycle can reduce the contact angle of water. It was super-hydrophilic within the concentration of the acetic acid is 0.30M and positive voltage is 380V. The porous and the roughness can keep constant on the surface of oxide film, and the better of surface wettability by hydrothermal. After five days of cell culture, the film after hydrothermal treatment showed even higher cell viability than titanium.
Advisor Committee Mu-Rong Yang - advisor
Chia-Jung Hu - co-chair
Jeou-Long Lee - co-chair
Files Date of Defense 2010-07-28 Date of Submission 2010-09-13