1. Synthesis and properties of hydroxyapatite-containing porous titania coating on ultrafine-grained titanium by micro-arc oxidation.
- Author
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Yao, Z.Q., Ivanisenko, Yu., Diemant, T., Caron, A., Chuvilin, A., Jiang, J.Z., Valiev, R.Z., Qi, M., and Fecht, H.-J.
- Subjects
HYDROXYAPATITE ,POROUS materials ,TITANIUM dioxide ,OXIDATION ,SURFACE coatings ,MICROSTRUCTURE - Abstract
Abstract: Equal channel angular pressing results in ultrafine-grained (∼200–500nm) Ti with superior mechanical properties without harmful alloying elements, which benefits medical implants. To further improve the bioactivity of Ti surfaces, Ca/P-containing porous titania coatings were prepared on ultrafine-grained and coarse-grained Ti by micro-arc oxidation (MAO). The phase identification, composition, morphology and microstructure of the coatings and the thermal stability of ultrafine-grained Ti during MAO were investigated subsequently. The amounts of Ca, P and the Ca/P ratio of the coatings formed on ultrafine-grained Ti were greater than those on coarse-grained Ti. Nanocrystalline hydroxyapatite and α-Ca
3 (PO4 )2 phases appeared in the MAO coating formed on ultrafine-grained Ti for 20min (E20). Incubated in a simulated body fluid, bone-like apatite was completely formed on the surface of E20 after 2days, thus evidencing preferable bioactivity. Compared with initial ultrafine-grained Ti, the microhardness of the E20 substrate was reduced by 8% to 2.9GPa, which is considerably more than that of coarse-grained Ti (∼1.5GPa). [Copyright &y& Elsevier]- Published
- 2010
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