Studium adsorpčních vlastností oxidovaného povrchu slitiny TiNb optickými metodami

Rafaj, Zdeněk

Contemporary commercially used bone implants include a Ti-6Al-4V alloy. Due to the toxicity of aluminum and vanadium, a TiNb alloy with nontoxic elements appears to be a promising replacement. However, only limited information about this alloy is available. This study investigates TiNb surface by XPS and by a complementary method FT-RAIRS. Two sets of samples were prepared. One was only polished and spontaneously oxidized in the air (natural oxide), the other one was thermally oxidized (1h at 600ř C) after the polishing. Two samples of each oxide were treated either with H2O or with NaOH. It was found that after the preparation both samples (a natural and a thermal oxide) are in highly oxidized states TiO2 and Nb2O5. In case of the H2O treated natural oxide, these oxidation states are reduced by heating. Only small reduction after NaOH treatment is observed. This behavior is explained by a thin layer of Ti and Nb oxides. Thermal oxide seems to remain without changes during all procedures. IR spectroscopy does not prove an OH- groups appearance which is important for biocompatibility of a bone implant.

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