Journal
SURFACE & COATINGS TECHNOLOGY
Volume 204, Issue 20, Pages 3294-3299Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.03.044
Keywords
NiTi alloy; Micro-arc oxidation; Al(2)O(3) coating; Apatite; Biomimetic coating
Funding
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [HIT.NSRIF.200850]
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The biomedical NiTi alloy was treated by micro-arc oxidation in an electrolytes containing sodium aluminate and sodium hypophosphite at 400 V constant voltages for 30 min. The MAO-treated NiTi has a porous microstructure on its surface and coatings consisting only of the gamma-Al(2)O(3) phase. The ceramic coating prepared by micro-arc oxidation is composed of Al, Ti, Ni, O, and P with the atomic concentration of 26.98%, 3.67%, 3.33%, 65.30% and 0.72%, respectively. The MAO-treated NiTi was soaked in a simulated body fluid (1.0SBF) to investigate the biomimetic deposition of apatite on the surface of Al(2)O(3) coated NiTi alloy. It was found that Al(2)O(3) coated NiTi alloy shows an excellent apatite-forming ability after soaking in a simulated body fluid (1.0SBF) for 14 days, while no apatite-forming ability was observed on bared NiTi alloy even though soaking time is up to 28 days. (C) 2010 Elsevier B.V. All rights reserved.
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