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Variations of nanotubes on the Ti–Nb–Hf alloys with applied voltages

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Publication date: 1 December 2016
Source:Thin Solid Films, Volume 620
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 was 180min 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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