Abstract
Chemical treatment of a Ti substrate with 6 mass% H2O2 and subsequent thermal treatment yielded surface titania gel with enhanced ability of spontaneous in vitro deposition of apatite or bioactivity. We examined the effects of the chemical treatment time and the concentration and pH of the H2O2, solutions on both the formation of titania gel and in vitro bioactivity. The optimum treatments consisted of 6 mass% H2O2 treatment at 60°C for 3-6h and subsequent thermal treatment at 400°C for 1h. The formation of the titania gel layer proceeded in a pH range of 4 to 4.6, while the corrosion of the titania gel layer was enhanced at a pH below 4.3. The reactions between the titanium substrates and H2O2 involved the oxidation of titanium, titania gel formation and Ti (IV) dissolution. The optimized chemical and thermal treatments(CHT method) were applicable for providing a Ti mesh screen with high in vitro apatite-forming ability as well as Ti plates with or without grooves.
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