Biomimetic deposition of apatite coatings on micro-arc oxidation treated biomedical NiTi alloy

✍ Scribed by Fu Liu; Jilin Xu; Fuping Wang; Liancheng Zhao; Tadao Shimizu

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 425 KB
• Volume: 204
• Category: Article
• ISSN: 0257-8972
• DOI: 10.1016/j.surfcoat.2010.03.044

✦ Synopsis

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 γ-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.