| Summary: | 碩士 === 國立中興大學 === 材料工程學研究所 === 92 === The purpose of this study was to improve the adhesion and corrosion resistance of hydroxyapatite(HA) on implant alloys, by electrolytic deposition of HA/TiO2 double layers coatings on Ti-6Al-4V alloys. The alloys were subjected to electrolytic deposition in a TiCl4 alcoholic solution and subsequently in a mixed aqueous solution of Ca(NO3)2‧4H2O and NH4H2PO4 to form TiO(OH)2‧H2O interface layer and hydroxyapatite layer, respectively. Then the substrate was subjected to a low-temperature sintering process and transformed into a HA/TiO2 composite coating. The samples were characterized by XRD, SEM/EDS analysis; dynamic polarization tests; immersion tests; tensile tests; cell culture; and organ culture. The HA/TiO2 coated specimen revealed the better corrosion resistance than the HA and TiO2 coated or the uncoated. The adhesion strength of HA coatings on Ti-6Al-4V alloys were improved by the intermediate TiO2 coating. Also, immersion tests revealed the better bioactivity on HA/TiO2 or HA coated specimens than on the uncoated. Due to the best resistance and best bioactivity, the calvaria organ culture of HA/TiO2 also revealed the best osteoconduction.
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