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

SURFACE & COATINGS TECHNOLOGY

卷:240

Article

Cattini, Andrea^1,2  Bellucci, Devis¹  Sola, Antonella¹  Pawlowski, Lech²  Cannillo, Valeria¹ 

[1] Univ Modena & Reggio Emilia, Dept Engn Enzo Ferrari, I-41125 Modena, MO, Italy

[2] Univ Limoges, CNRS, UMR 7315, SPCTS, F-87068 Limoges, France

关键词: Suspension plasma spraying;    Bioactive glass;    Functional coating;   

DOI  :  10.1016/j.surfcoat.2013.12.023

来源: Elsevier

【 摘 要 】

bioactive glass topcoat was 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 low tendency to crystallize at high temperature. The standard HA coatings were sprayed through atmospheric plasma spray CAPS) 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 and without 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. (c) 2013 Elsevier B.V. All rights reserved.

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