Improvement of Apatite-Forming Ability of Titanium Metal Enriched with Calcium Ion on its Surface
It has been shown that titanium metal subjected to NaOH and heat treatments spontaneously forms a bonelike apatite on its surface in the living body and bonds to living bone. However, its apatite-forming ability was liable to decrease when the treated titanium metal was stored in humid environment. In the present study, the NaOH-treated titanium metal was soaked in a CaCl2 solution at 40°C for 24h, heat-treated at 600°C for 1h, and then soaked in ultrapure water at 80°C for 24h. Calcium titanate was formed on the surface of the titanium metal 1µm in thickness by these treatments. The resultant titanium metal showed high scratch resistance and high apatite-forming ability in a simulated body fluid. This high apatite-forming ability was maintained even after the titanium metal was kept in 95% relative humidity at 80°C for 1 week.
Marcelo Prado and Cecília Zavaglia
T. Kizuki et al., "Improvement of Apatite-Forming Ability of Titanium Metal Enriched with Calcium Ion on its Surface", Key Engineering Materials, Vols. 396-398, pp. 341-344, 2009