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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1349 (January) (2008)  >  pp.68-73

Journal of the Ceramic Society of Japan
<<Previous article Vol.116  No.1349 (January) (2008)   pp.68 - 73 Next article>>

Coating of hydroxyapatite films on titanium substrates by electrodeposition under pulse current

Tomoyasu HAYAKAWA1), Masakazu KAWASHITA2) and Gikan H. TAKAOAKA1)
1) Photonics and Electronics Science and Engineering Center, Graduate School of Engineering, Kyoto University
2) Center for Research Strategy and Support, Tohoku University


  Titanium (Ti) metal substrates were etched in sulfuric acid (H2SO4) with concentrations of 25, 50, 75 and 97% at 60°C for 30 min. Hydroxyapatite (HA) films were deposited onto unetched and etched substrates by an electrodeposition method under a pulse current. The electrolyte was metastable calcium phosphate solution that had 1.5 times the ion concentrations of human body fluid, but did not contain magnesium ion at 36.5°C. Deposition times were 90 min. We used the average current density of 0.01 A/cm2 and ON time equal to OFF time of 15 s. In the electrodeposition, hydrogen was incorporated into the surface of the Ti substrates to form titanium hydride (TiH2) on the substrate surfaces. After the electrodeposition, all specimens were heated at 600°C for 60 min. The adhesion between apatite and substrates were greatly improved by the heat treatment for the substrates etched in 50 and 75% H2SO4. It is considered that in these specimens the anchoring effect due to the microstructural roughness formed by etching was enhanced by the shrinking of HA crystals during the heat treatment.



Keyword:
Apatite, Titanium, Electrodeposition, Pulse current, Acid etching, Heat treatment

Received: October 10, 2007
Accepted: November 15, 2007 , Published online: January 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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