TITLE:
Surface Modification on Ti-30Ta Alloy for Biomedical Application
AUTHORS:
Patricia Capellato, Nicholas A. Riedel, John D. Williams, Joao P. B. Machado, Ketul C. Popat, Ana P. R. Alves Claro
KEYWORDS:
Biocompatibility; Ti-30Ta Alloy; Alkali Treatment; Heat Treatment; Simulated Body Fluid; Anodization Process; Ion Beam Etching
JOURNAL NAME:
Engineering,
Vol.5 No.9,
August
22,
2013
ABSTRACT: Titanium and titanium alloys are currently being used for clinical biomedical applications due to their high strength, corrosion resistance and elastic modulus. The Ti-30Ta alloy has gotten extensive application as the important biomedical materials. The substrate surface of the Ti-30Ta alloy was altered either by chemical or topographical surface modification. The biocompatibility of an implant is closely related to its surface properties. Thus surface modification is one of effective methods for improving the biocompatibility of implants. The development status of biomedical materials has been summarized firstly, the biomedical application. In this study Ti-30Ta alloy surface was investigate as-casting (Group 1) modified with alkaline and heat-treatments in NaOH with 1.5M at 60°C for 24 hrs (Group 2), alkaline and heat-treatments with SBF-coatings by immersion in NaOH and SBFX5 for 24hrs (Group 3), anodization process was performed in an electrolyte solution containing HF (48%) and H2SO4 (98%) with the addition of 5% dimethyl sulfoxide (DMSO) 35V for 40 min (Group 4) and ion beam etching with 1200 eV ions with a beam current of 200 mA for a 3 hrs etch (Group 5). SEM was used to investigate the topography, EDS the chemical composition, and surface energy was evaluate with water contact angle measurement. SEM results show different structure on the surface for each group. EDS spectra identified similarity on Group 1, 4 and 5. The results indicate for group 2 an amorphous sodium tantalate hydrogel layer on the substrate surface and for group 3 the apatite nucleation on substrate surface. The Group 4 shows unorganized and vertically nanotubes and Group 5 shows a little alteration in the topography on the substrate surfaces. Overall the contact angle shows Group 5 the most hydrophobic and Group 4 the most hydrophilic. The study indicates Group 3 and 4 with potential for biomedical application. The next step the authors need to spend more time to study group 3 and 4 in the biomedical sciences.