The paper reports the first attempt at employing the innovative High-Velocity Suspension Flame Spraying (HVSFS) technique in order to deposit bioactive glass coatings. Fine (micrometric) glass particles having a composition similar to that of the A-W (apatite-wollastonite) bioactive glass-ceramic as proposed by Kokubo were dispersed into a 50% water + 50% isopropanol solvent mixture and the resulting suspension (containing 20 wt.% glass powder) was thermally sprayed onto Ti plates using a modified high velocity oxy-fuel torch.Each torch pass produces a dense coating layer, featuring strong cohesion between lamellae thanks to viscous flow sintering along the interlamellar boundary. However, some porosity exists between different layers deposited during successive torch passes.In-vitro bioactivity tests indicate that the coatings interact remarkably with the simulated body fluid (SBF), developing a thick silica-rich layer containing hydroxyapatite crystals.
Microstructural and in vitro characterisation of High-Velocity Suspension Flame Sprayed (HVSFS) bioactive glass coating / Bolelli, Giovanni; Cannillo, Valeria; R., Gadow; A., Killinger; Lusvarghi, Luca; J., Rauch. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - STAMPA. - 29:11(2009), pp. 2249-2257. [10.1016/j.jeurceramsoc.2009.01.032]
Microstructural and in vitro characterisation of High-Velocity Suspension Flame Sprayed (HVSFS) bioactive glass coating
BOLELLI, Giovanni;CANNILLO, Valeria;LUSVARGHI, Luca;
2009
Abstract
The paper reports the first attempt at employing the innovative High-Velocity Suspension Flame Spraying (HVSFS) technique in order to deposit bioactive glass coatings. Fine (micrometric) glass particles having a composition similar to that of the A-W (apatite-wollastonite) bioactive glass-ceramic as proposed by Kokubo were dispersed into a 50% water + 50% isopropanol solvent mixture and the resulting suspension (containing 20 wt.% glass powder) was thermally sprayed onto Ti plates using a modified high velocity oxy-fuel torch.Each torch pass produces a dense coating layer, featuring strong cohesion between lamellae thanks to viscous flow sintering along the interlamellar boundary. However, some porosity exists between different layers deposited during successive torch passes.In-vitro bioactivity tests indicate that the coatings interact remarkably with the simulated body fluid (SBF), developing a thick silica-rich layer containing hydroxyapatite crystals.
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