Functionally graded HA-TiO2 nanostructured composite coating on Ti-6Al-4V substrate via electrophoretic deposition

Farnoush H., Aldiç G., Çimenoğlu H.

Surface and Coatings Technology, cilt.265, ss.7-15, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 265
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.surfcoat.2015.01.069
  • Dergi Adı: Surface and Coatings Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.7-15
  • Anahtar Kelimeler: Functionally graded material, Electrophoretic deposition, Hydroxyapatite, Electrochemical behavior, Bonding strength
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In the present study, electrophoretic deposition was carried out in the ethanol-based suspensions at the voltage of 20V for 3min to form functionally graded coatings of HA/TiO2 nanoparticles and HA-TiO2 nanocomposite coatings with 0, 10 and 20wt.% of TiO2 on Ti-6Al-4V substrate. The gradual addition of HA suspension into the deposition cell containing TiO2 nanoparticles caused the functionally graded structure of HA-TiO2 coatings. The microstructure of coatings showed the lower porosities by the addition of TiO2 and using graded structure. The pull-off test results showed the highest bonding strength for the graded coating. The electrochemical impedance spectroscopic studies after in vitro tests, revealed that the total corrosion resistance of graded coating is higher than that of HA and HA-TiO2 samples. The accelerated apatite formation on functionally graded coating corresponding to inductively coupled plasma spectroscopy was attributed to the higher wettability of its surface.