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Investigating Bio-Capability of HA-ZrO2-TiO2 Nano-Composite Coating by EPD on St. St 316 in Physiologic Solution

Pourraeisi, Morteza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48318 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdollah
  7. Abstract:
  8. Metallic implants are useful in dental and orthopedic applications. Bio coating is necessary to improve bio-compatibility and bio-activation of metallic implants. For this goal, HA is the most important material. In this research, the goal is to improve bio-compatibility of St. St 316 by coating HA, HA-ZrO2, HA-TiO2, HA-ZrO2-TiO2 using combination of electrodeposition and electrophoretic methods. To form HA, calcium and phosphor salt solution was used then ZrO2- TiO2 nanoparticles was added to solution. In order to analyst the coatings different tests were done. Thickness analysis, XRD, FT-IR, FE-SEM and EDS, bonding Strength, Polarization test, bio-compatibility and surface roughness analysis were used. XRD and FT-IR prove that HA is formed in coating conditions. Current density of St. St 316 in SBF Solution decreased form 1.5 µA/cm2 to 0.03 µA/cm2 by HA-PVA-TrX100 coat. Bonding strength of HA was increased by using PVA to 5 MPa. Immersion in SBF improves that HA is Biocompatible.In the next steps, adding ZrO2- TiO2 nanoparticles makes Nano composite coatings. XRD and FT-IR improves that HA, ZrO2 and TiO2 are in the coatings. In composite coatings thickness of coatings decreased and extreme changes in morphology of coating appeared by adding different particles. Nano particles are evident in FE-SEM analyze. Current densities of composite coats are similar to HA with small increase that is related to decrease in thickness and morphology changes. Immersion in SBF shows that bio-compatibility of composite coats increased compared to HA
  9. Keywords:
  10. Hydroxyapatite ; Biocompatibility ; Zirconia ; Electrophoretic ; Composite Coating ; Titania

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