Fabrication of TiO2 Crystalline Coatings by Combining Ti-6Al-4V Anodic Oxidation and Heat Treatments

International Journal of Biomaterials
María Laura VeraAlicia Esther Ares

Abstract

The bio- and hemocompatibility of titanium alloys are due to the formation of a TiO2 layer. This natural oxide may have fissures which are detrimental to its properties. Anodic oxidation is used to obtain thicker films. By means of this technique, at low voltages oxidation, amorphous and low roughness coatings are obtained, while, above a certain voltage, crystalline and porous coatings are obtained. According to the literature, the crystalline phases of TiO2, anatase, and rutile would present greater biocompatibility than the amorphous phase. On the other hand, for hemocompatible applications, smooth and homogeneous surfaces are required. One way to obtain crystalline and homogeneous coatings is by heat treatments after anodic oxidation. The aim of this study is to evaluate the influence of heat treatments on the thickness, morphology, and crystalline structure of the TiO2 anodic coatings. The characterization was performed by optical and scanning electron microscopy, X-ray diffraction, and X-ray reflectometry. Coatings with different colors of interference were obtained. There were no significant changes in the surface morphology and roughness after heat treatment of 500°C. Heat treated coatings have different proportions of ...Continue Reading

References

Apr 18, 2003·Biomaterials·N HuangY Leng
Nov 15, 2003·Biomaterials·Bangcheng YangTadashi Kokubo
Jul 25, 2009·Journal of the Mechanical Behavior of Biomedical Materials·Carlos Nelson EliasCarlos Alberto Muller

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Methods Mentioned

BETA
scanning electron microscopy
X-ray
thermal
thermal treatment

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