Turkish Journal
of
Engineering and Environmental Sciences
engineering@tubitak.gov.tr
Turkish Journal of Engineering and Environmental Sciences
Thermal Stability of Hydroxylapatite-Titanium and Hydroxylapatite- Titania Compositesİstanbul Technical University, Faculty of Mechanical Engineering,
İstanbul, TURKEY
e-mail: ergunce@itu.edu.tr
Robert H. DOREMUS
Materials Science and Engineering Department,
Rensselaer Polytechnic Institute, Troy, NY 12180 USA
e-mail: doremr@rpi.edu
Abstract: The aim of the current study is to investigate the reaction of hydroxylapatite with both metallic titanium and titanium oxide, and to examine the effect of atmosphere on these reactions. For this purpose, hydroxylapatite composites with both metallic titanium powder and titanium oxide were prepared and sintered at 1100 °C for 2 h under 2 different conditions: in air and in evacuated glass tubes with hot isostatic pressing at 120MPa. The reaction was monitored with XRD and thermal analysis. No significant reaction was identified between hydroxylapatite and metallic titanium in the vacuum environment. However, a reaction occurred between hydroxylapatite and titanium oxide, which formed CaTiO3 with a perovskite structure, Ca3(PO4)2 (whitlockite) and water. The presence of air in the sintering environment promoted this reaction.
Key Words: Hydroxylapatite, titanium, biomaterials, implants, interface.
Turkish J. Eng. Env. Sci., 27, (2003), 423-430.
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Other articles published in the same issue: Turkish J. Eng. Env. Sci.,vol.27,iss.6.