کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5368215 | 1388385 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of functionally graded bioactive glass-apatite multistructures on Ti substrates by pulsed laser deposition Synthesis of functionally graded bioactive glass-apatite multistructures on Ti substrates by pulsed laser deposition](/preview/png/5368215.png)
Functionally graded glass-apatite multistructures were synthesized by pulsed laser deposition on Ti substrates. We used sintered targets of hydroxyapatite Ca10(PO4)6(OH)2, or bioglasses in the system SiO2-Na2O-K2O-CaO-MgO-P2O5 with SiO2 content of either 57 wt.% (6P57) or 61 wt.% (6P61). A UV KrF* (λ = 248 nm, Ï > 7 ns) excimer laser source was used for the multipulse laser ablation of the targets. The hydroxyapatite thin films were obtained in H2O vapors, while the bioglass layers were deposited in O2. Thin films of 6P61 were deposited in direct contact with Ti, because Ti and this glass have similar thermal expansion behaviors, which ensure good bioglass adhesion to the substrate. This glass, however, is not bioactive, so yet more depositions of 6P57 bioglass and/or hydroxyapatite thin films were performed. All structures with hydroxyapatite overcoating were post-treated in a flux of water vapors. The obtained multistructures were characterized by various techniques. X-ray investigations of the coatings found small amounts of crystalline hydroxyapatite in the outer layers. The scanning electron microscopy analyses revealed homogeneous coatings with good adhesion to the Ti substrate. Our studies showed that the multistructures we had obtained were compatible with further use in biomimetic metallic implants with glass-apatite coating applications.
Journal: Applied Surface Science - Volume 254, Issue 4, 15 December 2007, Pages 1279-1282