Effect of electrical-discharging on formation of nanoporous biocompatible layer on titanium
Resource
JOURNAL OF ALLOYS AND COMPOUNDS, 492(1-2), 625-630
Journal
Journal of Alloys and Compounds
Pages
625-630
Date Issued
2010
Date
2010
Author(s)
Peng, Pei-Wen
Ou, Keng-Liang
Lin, Hsi-Chen
Pan, Yung-Ning
Wang, Chau-Hsiang
Abstract
In this study, we performed an electrical discharge machining (EDM), by which a recast layer was formed on a titanium surface. Subsequently, an α-phase and a γ-TiH-(γ-hydride)-phase were formed on the recast layer by electrical-discharging. Nano-(δ + γ) hydrides play important roles in the formation of nanostructural oxide layers. Electrical-discharging not only generates a nanostructural recast layer but also converts the alloy surface into a nanostructured oxide surface, which increases the alloy biocompatibility. A γ-hydride microstructure was also formed on the recast layer following electrical-discharging. The microstructure had a tetragonal structure with lattice constant a = 0.421 nm. In the recast layer, a transition, α → (α + δ) → (δ + γ) → γ, occurred during electrical-discharging. This result has never been previously reported. The recast layer that contains nanophases was dissolved during electrical-discharging; by this process, electrical-discharging for a short duration yields nanoporous TiO2. Hence, electric discharging for a short duration leads to the production of nanostructures as well as bioactive titanium. © 2009 Elsevier B.V. All rights reserved.
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