Nanomechanical properties, wear resistance and in-vitro characterization of Ta2O5nanotubes coating on biomedical grade Ti-6Al-4V

Sarraf M 1 , Razak BA 2 , Nasiri-Tabrizi B 3 , Dabbagh A 4 , Kasim NHA 5 , Basirun WJ 6 Show all authors , Bin Sulaiman E 5

Affiliations 

  • 1 Center of Advanced Manufacturing and Material Processing, Department of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia; Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
  • 2 Center of Advanced Manufacturing and Material Processing, Department of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia; Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia; Department of Mechanical Engineering, Faculty of Engineering, University of UCLA, Los Angeles, CA 90032, United States; Department of Mechanical and Aerospace Engineering, University of California, CA 90095-1597, United States. Electronic address: bushroa@um.edu.my
  • 3 Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran. Electronic address: bahman_nasiri@hotmail.com
  • 4 Center of Advanced Manufacturing and Material Processing, Department of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia; Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia
  • 5 Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia
  • 6 Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
J Mech Behav Biomed Mater, 2017 02;66:159-171.
PMID: 27886563 DOI: 10.1016/j.jmbbm.2016.11.012

Abstract

Tantalum pentoxide nanotubes (Ta2O5NTs) can dramatically raise the biological functions of different kinds of cells, thus have promising applications in biomedical fields. In this study, Ta2O5NTs were prepared on biomedical grade Ti-6Al-4V alloy (Ti64) via physical vapor deposition (PVD) and a successive two-step anodization in H2SO4: HF (99:1)+5% EG electrolyte at a constant potential of 15V. To improve the adhesion of nanotubular array coating on Ti64, heat treatment was carried out at 450°C for 1h under atmospheric pressure with a heating/cooling rate of 1°Cmin-1. The surface topography and composition of the nanostructured coatings were examined by atomic force microscopy (AFM) and X-ray electron spectroscopy (XPS), to gather information about the corrosion behavior, wear resistance and bioactivity in simulated body fluids (SBF). From the nanoindentation experiments, the Young's modulus and hardness of the 5min anodized sample were ~ 135 and 6GPa, but increased to ~ 160 and 7.5GPa, respectively, after annealing at 450°C. It was shown that the corrosion resistance of Ti64 plates with nanotubular surface modification was higher than that of the bare substrate, where the 450°C annealed specimen revealed the highest corrosion protection efficiency (99%). Results from the SBF tests showed that a bone-like apatite layer was formed on nanotubular array coating, as early as the first day of immersion in simulated body fluid (SBF), indicating the importance of nanotubular configuration on the in-vitro bioactivity.

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