科研之友
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摘要
TiO2/apatite coating on metal implants is an effective method to enhance the biological properties of the metal surface. In this study, porous NiTi with a banded structure of channels and an average porosity of 45 vol% was prepared by self-propagating high-temperature synthesis. Samples were subjected to chemical treatment in H2O2/HCl to form a layer of nanocrystallite TiO2 coating. A biomimetic process of soaking the samples in a simulated body fluid (SBF) was subsequently employed to deposit a nanocrystallite apatite coating on the surface of the TiO2 coating. Analysis of the coatings showed that a nanocrystallite TiO2 coating with anatase phase was formed on the surface of porous NiTi. A carbonated and non-stoichiometric nanocrystallite apatite coating with Ca/P ratio of 1.49 was biomimetically deposited on the surface of TiO2, which has similar mineral composition to that of natural bone. The thickness of the TiO2 and apatite coatings increased with increasing chemical treatment time and the immersion period in SBF, respectively. The growth kinetics and mechanism are also discussed. Results suggested that the TiO2/apatite nanocomposite coatings can be deposited on porous NiTi by chemical treatment and a subsequent biomimetic process.
- 出版日期2006-5-14
