| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系 === 106 === This study aimed to fabricate a sliver/collagen-composite coating on titanium and nitinol by micro-arc oxidation followed by electrochemical deposition. The effects of electrochemical-deposition voltage, duration and electrolyte concentration on the composition of the coating were investigated. Results indicated that a long deposition duration and high voltage resulted in high amounts of silver on the titanium oxide surface. In addition, silver grew into a dendritic structure under long deposition duration. Addition of collagen into electrolyte was beneficial to uniformly disperse the deposited silver particles. However, in the collagen containing electrolyte, long deposition duration and high collagen concentration caused silver particles to agglomerate. The agglomerates comprised sliver and collagen identified by Fourier-transform infrared spectrometer and x-ray diffraction spectroscopy. Furthermore, collagen in the electrolyte inhibited the silver deposition rate. The effect of deposition parameters on silver deposition rate is similar when applying electrochemical deposition on titanium and nitinol. Increasing the thickness of titanium oxide on the surface of nitinol decreased the silver deposition rate. The deposited silver particles not only covered the surface of the oxide layer but also existed in the pores inside the oxide layer observed by cross-sectional transmission electron microscopy.
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