| Summary: | 碩士 === 國立中興大學 === 材料工程學研究所 === 92 === Abstract
This research is to improve the mechanical strength and adhesion of HA on implant alloys. Eelectrolytic hydroxyapatite HA/TiO2 double layers coatings on Co-Cr-Mo alloys were conducted in TiCl4 solution and subsequent in a mixing solution of Ca(NO3)2．4H2O and NH4H2PO4. Due to the strong chemical bonding, TiO2 was used as a bond layer to enhance the mechanical property of HA. By controlling the electrochemical parameters, the optimum condition for HA/ TiO2 coatings on Co-Cr-Mo alloys substrate was investigated. SEM/EDS, XRD, ultrasonic vibrating tests, tensile tests, polarization tests, immersion tests , cell culture and in vitro organ culture were used to characterize the mechanical properties, corrosion resistance and bioactivity of the HA/TiO2 composite coated alloys.
It was found that the HA/TiO2 double layers coatings can further improve the oxidation resistance and corrosion resistance of Co-Cr-Mo alloys, and enhance the adhesion strength of HA on alloys from 18.3MPa to 32.7MPa. Also, the bioactivity and osteoconductivity of the Co-Cr-Mo has been dramatically improved by the HA/TiO2 double layers coatings. Conclusively, the osteoconduction ratio of organ culture ended with the outcome, HA/TiO2 (7days)＞HA (14days)＞substrate (28days).
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