Formation of bioactive functionally graded structure on Ti-6Al-4V alloy by chemical surface treatment |
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Authors: | H-M Kim H Takadama F Miyaji T Kokubo S Nishiguchi T Nakamura |
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Affiliation: | (1) Department of Material Chemistry, Faculty of Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–8501, Japan;(2) Department of Material Chemistry, Faculty of Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–8501, Japan;(3) Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto, 606–8506, Japan |
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Abstract: | An Al- and V-free sodium titanate hydrogel layer with a graded structure where the sodium titanate gradually decreases toward the interior, was formed on the surface of Ti-6Al-4V alloy, when the alloy was exposed to 5M NaOH solution at 60 °C for 24 h. This gel layer was transformed into an amorphous sodium titanate layer without giving considerable change in the graded structure, except a little increase in the depth of the oxygen distribution by a heat treatment at 600 °C for 1 h. The sodium titanate layer formed Ti-OH groups on its surface by exchanging its Na+ ion with H3O+ ion in simulated body fluid when soaked in the fluid, and thus formed Ti-OH groups induced the apatite nucleation. The apatite layer also formed a graded structure toward the substrate. The strong bond of the apatite layer to the substrate was attributed to this graded structure. |
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