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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Kim, HM., Takadama, H., Miyaji, F. et al. Formation of bioactive functionally graded structure on Ti-6Al-4V alloy by chemical surface treatment. Journal of Materials Science: Materials in Medicine 11, 555–559 (2000). https://doi.org/10.1023/A:1008924102096
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DOI: https://doi.org/10.1023/A:1008924102096