Fabrication and characterization of nano-HA-45S5 bioglass composite coatings on calcium-phosphate containing micro-arc oxidized CP-Ti substrates


Farnoush H., Muhaffel F. , CIMENOGLU H.

APPLIED SURFACE SCIENCE, vol.324, pp.765-774, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 324
  • Publication Date: 2015
  • Doi Number: 10.1016/j.apsusc.2014.11.032
  • Title of Journal : APPLIED SURFACE SCIENCE
  • Page Numbers: pp.765-774
  • Keywords: Micro-arc oxidation, Electrophoretic deposition, Bioglass, Hydroxyapatite, Bonding strength, Corrosion behavior, ELECTROPHORETIC DEPOSITION, HYDROXYAPATITE COATINGS, INNOVATIVE FABRICATION, CORROSION BEHAVIOR, OXIDATION, TITANIUM, BIOACTIVITY, MAGNESIUM, FILMS, NANOCOMPOSITES

Abstract

In the present study, micro-arc oxidation (MAO) was carried out on commercially pure titanium (CP-Ti) to fabricate porous titanium oxide coatings containing calcium phosphates (Cap) at different applied voltages of 300, 330 and 360 V for 5 min. Subsequently, nano-hydroxyapatite (HA) and HA-4555 bioglass (BG) composite were effectively coated on micro-arc oxidized substrate by electrophoretic deposition (EPD) at a constant voltage of 30 V for 120 s. The phase, structural agents, microstructure and composition of MAO interlayer and subsequent EPD coatings were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy, respectively. Thermal stability of the as-deposited coatings was analyzed by simultaneous differential scanning calorimetry and thermal gravimetery. The pull-off adhesion tests showed the highest bonding strength was obtained for HA-BG coating on micro-oxidized sample at 360 V. The results of potentiodynamic polarization and impedance spectroscopic measurements in simulated body fluid solution depicted that the combination of MAO treatment at 360 V and EPD of HA-BG composite could effectively increase the corrosion resistance of CP-Ti substrates. (C) 2014 Elsevier B.V. All rights reserved.