Surface characteristics of HA coated Ti-Hf binary alloys after nanotube formation |
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Authors: | Yong-Hoon JEONG Won-Gi KIM Geun-Hyeong PARK Han-Cheol CHOE Yeong-Mu KO |
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Affiliation: | aDepartment of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, Chosun University, Gwangju, 501-759, Korea;bResearch Center for Oral Disease Regulation of the Aged, College of Dentistry, Chosun University, Gwangju, 501-759, Korea |
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Abstract: | Ti-Hf binary alloys contained 10%, 20%, 30% and 40% (mass fraction)Hf were manufactured in the vacuum furnace system. And then, specimens were homogenized for 24 h at 1 000 °C in argon atmosphere. The formation of oxide nanotubes was conducted by anodic oxidation on the Ti-Hf alloy in 1 mol/L H3PO4 electrolytes containing small amounts of NaF at room temperature. The hydroxyapatite (HA) coating made of tooth ash prepared by electron-beam physical vapor deposition (EB-PVD) method. The corrosion behaviors of the specimens were examined through potentiodynamic test in 0.9% NaCl solution by potentiostat. The microstructures of the alloys were examined by field emission scanning electron microscopy (FE-SEM) and x-ray diffractometer (XRD). It was observed that the lamellar structure translated to needle-like structure with Hf contents. Nanotube formed and HA coated Ti-xHf alloys had a good corrosion resistance. |
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Keywords: | Ti-Hf alloy nanotube hydroxyapatite EB-PVD corrosion resistance |
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