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Date of Publication:2011-01-01

Journal:大连理工大学学报

Volume:51

Issue:6

Page Number:798-802

ISSN No.:1000-8608

Abstract:To improve the bioactivity of Ti2448 alloy surfaces, porous titania
   coating was prepared by micro-arc oxidation (MAO) in the solution
   containing Ca and P ion and subsequent alkaline treatment. The structure
   and properties of the coating were analyzed by X-ray diffraction,
   scanning electron microscope equipped with energy-dispersive X-ray
   spectroscopy and X-ray photoelectron spectroscopy. The amounts of Ca, P
   and Ca and P ratio of the MAO coating increase with the increasing of
   reaction time, but improvement of bioactivity is not quite obvious by
   the single MAO method. The micro-pore sodium titanate (100 nm in
   diameter) layer containing OH forms and P element disappears after
   subsequent alkaline treatment. The OH on the surface accelerates the
   nucleation of hydroxy apatite (HA) in simulated body fluid; the high
   amount of Ca ion enhances the growth of HA. Incubated in simulated body
   fluid within 7 days, bone-like HA is formed on T20A after 20 min of
   oxidation and alkaline treatment, as evidence of preferable bioactivity.

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