Deposition, Characterization, and Corrosion Resistance of Nanocrystalline Bioactive Hydroxyapatite Ceramic Coating on New Ti ‐20 Nb ‐10 Zr ‐5 Ta Alloy

A new Ti ‐20 Nb ‐10 Zr ‐5 Ta bioalloy with low Young's modulus (59 GPa) was coated with nanocrystalline hydroxyapatite ( HA ) ceramic layer by chemical method of soaking in a slightly supersaturated calcium and phosphate ions solution. The formation of HA was demonstrated using XRD , Raman micr...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2012-12, Vol.95 (12), p.3807-3814
Main Authors: Popa, Monica, Vasilescu, Ecaterina, Drob, Paula, Popa, Mihai Vasile, Moreno, Jose Maria Calderon, Vasilescu, Cora, Drob, Silviu Iulian
Format: Article
Language:English
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Summary:A new Ti ‐20 Nb ‐10 Zr ‐5 Ta bioalloy with low Young's modulus (59 GPa) was coated with nanocrystalline hydroxyapatite ( HA ) ceramic layer by chemical method of soaking in a slightly supersaturated calcium and phosphate ions solution. The formation of HA was demonstrated using XRD , Raman microscopy and energy‐dispersive X‐ray spectroscopy; the coating morphology and microstructure were determined using SEM . The coating protective capacity and its long‐term (2000 h) stability in simulated biofluids were revealed by the improvement of the all electrochemical parameters; also, HA ceramic coating reduced the alloy corrosion and ion release rates. After 2000 immersion hours in biofluids no compositional change occurs in the HA ceramic coating, only depositions from solution take place that change the coating morphology. Also, the in time increase of the coating stability and thickness (as a result of the new deposition from physiological solutions) indicates bioactivity.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.12029