Springer Online Journal Archives 1860-2000
Abstract Titanium plates were treated in [Ti(O2)EDTA]2-– -Ca(EDTA)2- mixed solutions and/or Ca(EDTA)2- solutions (where EDTA is ethylene diamine tetra acetic acid) at pH 9–13 and 150–250 °C for 0.5–12 h. The film, about 50 μm thick, and consisting of mixtures of CaTiO3 and TiO2 was formed in 0.01 M [Ti(O2)EDTA]2- – 0.01 M Ca(EDTA)2- mixed solution at pH 13 and 250 °C for 6 h. The film consisted of large icosahedral and hexagonal particles, of about 10 μm diameter, and small aggregated particles, of about 1 μm diameter. On the other hand, the film, about 20 μm thick, consisted of hexagonal plate-like CaTiO3 particles, of about 1 μm diameter, was formed in 0.01 M Ca(EDTA)2- solution at pH 13 and 250 °C for 6 h. The thickness of both films increased with time, where the film formation rate in 0.01 M [Ti(O2)EDTA]2- – 0.01 M Ca(EDTA)2- mixed solution was much faster. The CaTiO3 film formed on the surface of titanium promoted the precipitation of hydroxyapatite on the substrate by the hydrothermal reactions in Ca(EDTA)2-–PO 4 3- mixed solutions.
Type of Medium: