Synthesis and properties of hydroxyapatite-containing porous titania coating on ultrafine-grained titanium by micro-arc oxidation |
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| Authors: | Z.Q. Yao Yu. Ivanisenko T. Diemant A. Caron A. Chuvilin J.Z. Jiang R.Z. Valiev M. Qi H.-J. Fecht |
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| Affiliation: | 1. Center of Advanced Manufacturing and Material Processing, Department of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Department of Research and Development, Azarin Kar Ind. Co., Industrial Zone 1, 7635168361 Kerman, Iran;1. Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, Poland;2. Institute of Materials Science, University of Silesia, 75 Pu?ku Piechoty Street 1 A, 41-500 Chorzow, Poland;3. The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego Street 152, 31-342 Krakow, Poland;4. Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza Street 30, 30-059 Krakow, Poland;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials, Ministry of Education, Department of Materials Science and Engineering, Shandong University, Ji''nan 250061, Shandong, PR China;2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture, Shandong University, Ministry of Education, School of Mechanical Engineering, Shandong University, Ji''nan 250061, Shandong, PR China |
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| Abstract: | Equal channel angular pressing results in ultrafine-grained (～200–500 nm) 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-Ca3(PO4)2 phases appeared in the MAO coating formed on ultrafine-grained Ti for 20 min (E20). Incubated in a simulated body fluid, bone-like apatite was completely formed on the surface of E20 after 2 days, thus evidencing preferable bioactivity. Compared with initial ultrafine-grained Ti, the microhardness of the E20 substrate was reduced by 8% to 2.9 GPa, which is considerably more than that of coarse-grained Ti (～1.5 GPa). |
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