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Variations of Nanotubes on the Ti-Nb-Hf Alloys with Applied Voltages

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Publication date: Available online 3 November 2016
Source:Thin Solid Films
Author(s): Seon-Yeong Park, Han-Cheol Choe
In this study, variations of nanotubes on the Ti-Nb-Hf alloys with applied voltages in dental applications were studied using different experimental techniques. Cone-shaped nanotubes were formed during the anodization of Ti–29Nb-xHf alloys by varying the applied DC voltage from 10 to 30V, and from 30 to 10V. The anodization time was180 min and the electrolyte was 1M H3PO4 with 0.8wt.% NaF. The morphology changes in anodized Ti-29Nb-xHf alloys were analyzed by optical microscopy, field emission scanning electron microscopy and X-ray diffractometer. The microstructures of the Ti-29Nb-xHf alloys changed from needle-like to an equiaxed structure, and with the increasing of Hf content, the β-phase gradually increased with a concomitant decrease in the α″-phase. Cone-shaped nanotubes were formed when the applied voltage was stepped up and the inversed cone-shape nanotube was formed on stepping down the applied voltage. The diameter, cross-section, length, and shape of the nanotube on the Ti-29Nb-xHf alloys can be controlled both by varying the applied voltage and the Hf content.


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