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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Surface characteristics of HA coated Ti-Hf binary alloys
after nanotube formation
Yong-Hoon JEONG1, Won-Gi KIM1, Geun-Hyeong PARK1, Han-Cheol CHOE1, Yeong-Mu KO1,

1. Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials,
College of Dentistry, Chosun University, Gwangju, 501-759, Korea;
2. Research Center for Oral Disease Regulation of the Aged, College of Dentistry, Chosun University,
Gwangju, 501-759, Korea

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 ℃ 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.

 

Key words: Ti-Hf alloy; nanotube; hydroxyapatite; EB-PVD; corrosion resistance

ISSN 1672-7029
CN 43-1423/U

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