Apatite Formation on Surface of Plasma-Sprayed TiO2 Coating by Sulfuric Acid Treatment
TiO2 coatings on titanium alloy substrates were prepared by atmospheric plasma spraying using commercial nano-powders and followed by H2SO4 treatment. The bioactivity of coatings was evaluated by the simulated body fluid soaking test. Scanning electron microscopy and energy-dispersive X-ray spectrometry were used to characterize the surface morphologies and phase composition of the coating before and after soaking in simulated body fluid. The results obtained indicate that H2SO4-treated TiO2 coating can induce a bone-like apatite formation on its surface, however, no apatite appears on the surface of as-sprayed TiO2 coatings. The acid concentration and treated time affected the bioactivities of TiO2 coatings.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
X. B. Zhao et al., "Apatite Formation on Surface of Plasma-Sprayed TiO2 Coating by Sulfuric Acid Treatment", Materials Science Forum, Vols. 544-545, pp. 653-656, 2007