| 3504 Coloration of titanium metal using various oxide film forming methods | ||
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H.-J. SONG, Y.-H. JEONG, M.-K. KIM, J.-H. CHOI, and Y.-J. PARK, Chonnam National University, College of Dentistry, Gwangju, South Korea Objectives: This study was purposed to develop a precise colorization method for titanium metals used in implant components and orthodontic brackets by forming oxide film using various techniques with theoretical analysis. Methods: Thin titanium oxide films were fabricated for colorization by anodic oxidation, thermal oxidation in air, and hydrothermal oxidation. For colorization by hydrothermal oxidation, 3d transition metal elements such as Co, Fe, Mn, V, and Cu were doped during oxide formation. Cross-sectional FE-SEM images were used for measuring film thickness, and the color was analyzed using colorimeter. The optical absorption and reflection spectra in the visible wavelength region were measured by spectrophotometer. Results: By anodic oxidation and thermal oxidation, thin oxide films were formed and those could contribute to coloration due to optical interferences in film. More diverse and homogeneous colors could be obtained by anodic oxidation when comparing to those obtained by thermal oxidation. However, coloration using anodic oxidation was affected by applied current, electrolyte type, and surface condition of substrate metal. For consistent coloration, this variability in color could be overcome by combining real-time color measurement system. Inherent coloration of the oxide film itself could be obtained by using hydrothermal spray oxidation technique combined with doping of 3d transition elements, which form new impurity energy levels in the energy band gap of TiO2. The color changes could be analyzed by applying crystal field theory Conclusion: Real-time color measurement system in anodic oxidation process could perform precise control of coloration for titanium metal. And, hydrothermal spray oxidation combined with doping of 3d transition elements endowed color in thick titanium oxide films. This work was supported by Korea Research Foundation Grant (KRF-2003-003-E00208). | ||
| Seq #360 - Biomechanics/Implant Surfaces 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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