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Hydroxyapatite Coating on Nanotubes TiO2

Goodarzi, Mena | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40771 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdollah; Dolati, Abolghasem
  7. Abstract:
  8. There are many techniques that have been used to create hydroxyapatite nanoparticles coating on nanotubes. Electrophoretic deposition (EPD) is one of the methods that has advantages of short formation time, needs simple apparatus, little restriction of the shape of substrate, no requirement for binder burnout as the green coating contains few or no organics. In the research, first, titanium dioxide nanotubes were fabricated by anodic oxidation. Anodizing voltage effect on the morphology of nanotubes was evaluated. SEM images was shown that in the anodizing voltage 20V, nanotubes were the most regular. Then, Hydroxyapatite nanoparticles has been deposited onto nanotublar TiO2 by electrophoretic deposition. Coatings characterisation has been determined by the use of SEM, XRD, EDX, FTIR and ICP. Also, adhesion strength and corrosion behavior in SBF at 37˚С was evaluated. The effect voltage, time, sintering temperature, Thickness and the deposition rate was evaluated. The results show that the application of higher potential increases the deposition rate and indicate that the amount of deposits increase with potential so that in voltage 150V, Surface completely covered with hydroxyapatite and tubes are not specified. Increase of sintering temperature and also coating temperature during EPD increases the adhesion strength so that in the coating temperature of 60˚С and sintering temperature of 800˚С, Adhesion strength to 7.7MPa is now. Sintering improve corrosion behavior in SBF
  9. Keywords:
  10. Anodizing ; Electrophoretic ; Hydroxyapatite ; Nanoparticles ; Apatite Coating ; Titanium Oxide Nanotube

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