Hydroxyapatite/titania sol-gel coatings on titanium-zirconium alloy for biomedical applications.
A simple sol-gel method was developed for hydroxyapatite/titania (HA/TiO(2)) coatings on non-toxic titanium-zirconium (TiZr) alloy for biomedical applications. The HA/TiO(2)-coated TiZr alloy displayed excellent bioactivity when soaked in a simulated body fluid (SBF) for an appropriate period. Differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy-energy dispersive spectrometry were used to characterize the phase transformations and the surface structures and to assess the in vitro tests. The HA/TiO(2) layers were spin-coated on the surface of TiZr alloy at a speed of 3000rpm for 15s, followed by a heat treatment at 600 degrees C for 20min in an argon atmosphere sequentially. The TiO(2) layer exhibited a cracked surface and an anatase structure and the HA layer displayed a uniform dense structure. Both the TiO(2) and HA layers were 25microm thick, and the total thickness of the HA/TiO(2) coatings was 50microm. The TiZr alloy after the above HA/TiO(2) coatings displayed excellent bone-like apatite-forming ability when soaked in SBF and can be anticipated to be a promising load-bearing implant material.
Wen
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Centre for Material and Fibre Innovation, Deakin University, Geelong Vic. 3217, Australia. cuie.wen@deakin.edu.au
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Hodgson
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D000497:Alloys / Q000737:chemistry*; D001826:Body Fluids / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003198:Computer Simulation; D017886:Durapatite / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D005782:Gels / Q000737:chemistry; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D044367:Phase Transition; D013818:Thermogravimetry; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
D000497:Alloys; D020099:Coated Materials, Biocompatible; D005782:Gels; C009495:titanium dioxide; D017886:Durapatite; D015040:Zirconium; D014025:Titanium