Bond-coating in plasma-sprayed calcium-phosphate coatings

F. N. Oktar*, M. Yetmez, S. Agathopoulos, T. M.Lopez Goerne, G. Goller, I. Ipeker, J. M.F. Ferreira

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The influence of bond-coating on the mechanical properties of plasma-spray coatings of hydroxyatite on Ti was investigated. Plasma-spray powder was produced from human teeth enamel and dentine. Before processing the main apatite coating, a very thin layer of Al2O3/TiO2 was applied on super clean and roughened, by Al2O3 blasting, Ti surface as bond-coating. The experimental results showed that bond-coating caused significant increase of the mechanical properties of the coating layer: In the case of the enamel powder from 6.66 MPa of the simple coating to 9.71 MPa for the bond-coating and in the case of the dentine powder from 6.27 MPa to 7.84 MPa, respectively. Both tooth derived powders feature high thermal stability likely due to their relatively high content of fluorine. Therefore, F-rich apatites, such those investigated in this study, emerge themselves as superior candidate materials for calcium phosphate coatings of producing medical devices. The methods of apatite powder production and shaping optimization of powder particles are both key factors of a successful coating. The methods used in this study can be adopted as handy, inexpensive and reliable ways to produce high quality of powders for plasma spray purposes.

Original languageEnglish
Pages (from-to)1161-1171
Number of pages11
JournalJournal of Materials Science: Materials in Medicine
Volume17
Issue number11
DOIs
Publication statusPublished - Nov 2006

Funding

Acknowledgements The authors gratefully acknowledge the assistance of Yasar C¸ elik and Turgut Halamoglu from Senkron Ceramic Coating Inc. for the plasma-coating process, Prof. Dr. Hadi Ozbal from the Chemistry Department of Bogazici University for powder-preparation, and Prof. Dr. Nuri Akkas for the tensile strength tests. The financial support of the Portuguese FCT and CICECO are also gratefully acknowledged.

FundersFunder number
Centro de Investigação em Materiais Cerâmicos e Compósitos
Fundação para a Ciência e a Tecnologia

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