Chemical-Hydrothermal Synthesis of Bioinert ZrO_2-TiO_2 Film on Ti Substrates

摘要

The synthesis of bioinert oxide films on pure Ti surfaces by a combined chemical-hydrothermal treatment was investigated. Pure Ti substrates were chemically treated with H_2O_2/HNO_3 to form a TiO_2 gel layer. The specimens were then hydrothermally treated with Zr(OH)_4 dispersed NH_3/CH_3CH(OH)COOH aqueous solution in an autoclave at 453 K for 12 h. As a result, ZrO_2-TiO_2 composite films were successfully produced on the surface, and the volume fraction of ZrO_2 in the film was found to gradually increase from the substrate to the surface. The graded ZrO_2-TiO_2 film suppressed the deposition of hydroxyapatite on the surface during soaking in simulated body fluid.