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作者: Feng, B; Chen, JY; Qi, SK; He, L; Zhao, JZ; Zhang, XD
标题: Characterization of surface oxide films on titanium and bioactivity
来源出版物: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE, 13 (5): 457-464 MAY 2002
语言: English
文献类型: Article
KeyWords Plus: TRACE-ELEMENT RELEASE; DISSOLUTION; PASSIVATION; ROUGHNESS; IMPLANTS; ADHESION; ENERGIES; TI6AL4V; LAYER; XPS
摘要: Biological properties of titanium implant depend on its surface oxide film. In the present study, the surface oxide films on titanium were characterized and the relationship between the characterization and bioactivity of titanium was studied. The surface oxide films on titanium were obtained by heat-treatment in different oxidation atmospheres, such as air, oxygen and water vapor. The bioactivity of heat-treated titanium plates was investigated by immersion test in a supersaturated calcium phosphate solution. The surface roughness, energy morphology, position and crystal structure were used to characterize the titanium surfaces. The characterization was performed using profilometer, scanning electronic microscopy, ssesile drop method, X-ray photoelectron spectroscopy, common Bragg X-ray diffraction and sample tilting X-ray diffraction. Percentage of surface hydroxyl groups was determined by X-ray photoelectron spectroscopy analysis for titanium plates and density of surface hydroxyl groups was measured by chemical method for titanium powders. The results indicated that heat-treatment uniformly roughened the titanium surface and increased surface energy. After heat-treatment the surface titanium oxide was predominantly rutile TiO2, and crystal planes in the rutile films preferentially orientated in (1 1 0) plane with the highest density of titanium ions. Heat-treatment increased the amount of surface hydroxyl groups on titanium. The different oxidation atmospheres resulted in different percentages of oxygen species in TiO2