This study was performed to investigate the surface properties of electrochemically oxidized Ti-6Al-7Nb by anodic spark deposition technique. Discs of titanium alloy Ti-6Al-lNb of 20 mm in diameter and 2 mm in thickness were polished sequentially from...
This study was performed to investigate the surface properties of electrochemically oxidized Ti-6Al-7Nb by anodic spark deposition technique. Discs of titanium alloy Ti-6Al-lNb of 20 mm in diameter and 2 mm in thickness were polished sequentially from #300 to #1,000 emery paper. They were ultrasonically washed in ethyl alcohol and acetone for 5 min and dried in a desiccator. Ti-6Al-7Nb was anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 170-320 V and the current density was 30 mA/cm^2. The surface oxide film was characterized by X-ray diffractometer, scanning electron microscope (SEM) and X-ray photoemission spectroscopy (XPS). The results obtained were summarized as follows; The main crystal structure of the titanium oxide was anatase type as analyzed with thin-film X-ray diffractometery. The coatings were porous with Pore diameter of 1~4 ㎛. The diameter of micropores increased with increasing the spark forming voltage. The porous coatings showed the growth of cell structure and more compact texture with increasing the voltage. Ca/P ratio in coatings was increased with increasing the voltage.