Structure and Adhesion of Hydroxyapatite Films Electrochemically Deposited onto Titanium Substrates under Short-Pulse Current in Metastable Calcium Phosphate Solution

Kawashita Masakazu; Tomoyasu Hayakawa; Gikan H. Takaoka; Toshiki Miyazaki

doi:10.4028/www.scientific.net/KEM.396-398.377

Paper Titles

Morphological Study of Apatite Formation on NaOH- and Heat-Treated Titanium Metal
p.361

Nanomechanical Properties of Titanium Coated with Octacalcium Phosphate by Immersion in a Simplified Simulated Body Fluid
p.365

Nanometer Coatings of Hydroxyapatite Characterized by Glancing-Incidence X- Ray Diffraction
p.369

Surface Reaction of Titanium Oxide Film to Fluoride and Hydrogen Peroxide in Simulated Oral Environment
p.373

Structure and Adhesion of Hydroxyapatite Films Electrochemically Deposited onto Titanium Substrates under Short-Pulse Current in Metastable Calcium Phosphate Solution
p.377

Surface and Electrochemical Analysis of Titanium Submitted to Alkaline Treatment by SEM, XRD and EIS
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The Effect of Bioceramic Surface Modifications on Different Endosseous Implant and Surgical Design. A Series of In Vivo Studies in Dogs.
p.385

The Interaction between Human Osteoblastic Cells and Titanium Anodized with Sulphuric Acid Coated or not with Human Plasma Fibronectin
p.389

The Manipulation of Properties of Ti Bioalloys at Micro and Nanoscale Using Etching Procedures
p.393

HomeKey Engineering MaterialsKey Engineering Materials Vols. 396-398Structure and Adhesion of Hydroxyapatite Films...

Structure and Adhesion of Hydroxyapatite Films Electrochemically Deposited onto Titanium Substrates under Short-Pulse Current in Metastable Calcium Phosphate Solution

Abstract:

Hydroxyapatite (HA) films were deposited onto titanium (Ti) metal substrates by an electrodeposition method under a short-pulse current. Metastable calcium phosphate solution was used as the electrolyte. The ion concentration of the solution was 1.5 times that of human body fluid, but the solution did not contain magnesium ions at 36.5°C. We used an average current density of 0.01 A/cm2 and current-on time (TON) equal to current-off time (TOFF) of 10 ms, 100 ms, 1 s, and 15 s. The adhesive strength between HA and Ti substrates were relatively high at TON = TOFF = 10 ms. It is considered that small calcium phosphate crystals with low crystallinity were deposited on the Ti surface without reacting with other calcium phosphate crystals, H2O, and HCO3– in the surrounding environment. This resulted in relaxation of the lattice mismatch and enhancement of the adhesive strength between the HA crystals and Ti substrates.