Functional bioactive glass topcoats on hydroxyapatite coatings: Analysis of microstructure and in-vitro bioactivity

Abstract : A bioactive glass topcoatwas introduced to modify the surface morphology and in-vitro reactivity of hydroxyapatite (HA) coatings for biomedical applications. With this aim, a CaO-rich bioactive glass, termed BG_Ca (wt.%: 4.7 Na2O, 42.3 CaO, 6.1 P2O5, and 46.9 SiO2),was selected due to its good bioactivity and lowtendency to crystallize at high temperature. The standardHA coatings were sprayed through atmospheric plasmaspray (APS) on steel substrates starting from commercial powders (“APS-HA” samples). The HA coatings, in turn, were subsequently coated with a thin layer of bioactive glass by suspension plasma spray (SPS), thus obtaining the duplex systems (“APS-HA/SPS-BG_Ca” samples). The samples with andwithout the BG_Ca layer were analysed by microstructural characterization and by in vitro tests in simulated body fluid (SBF). The analysis revealed an increased reactivity of the APS-HA/SPS-BG_Ca samples compared to the glass-free APS-HA coatings. © 2013 Elsevier
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Andrea Cattini, D. Bellucci, Antonella Sola, Lech Pawlowski, Valeria Cannillo. Functional bioactive glass topcoats on hydroxyapatite coatings: Analysis of microstructure and in-vitro bioactivity. Surface and Coatings Technology, Elsevier, 2014, 240, pp.110-117. ⟨10.1016/j.surfcoat.2013.12.023⟩. ⟨hal-01102628⟩

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