Microstructural design of functionally graded coatings composed of suspension plasma sprayed hydroxyapatite and bioactive glass

Abstract : Various bioactive glass/hydroxyapatite (HA) functional coatings were designed by the suspension plasma spraying (SPS) technique. Their microstructure, scratch resistance, and apatite-forming ability in a simulated body fluid (SBF) were compared. The functional coatings design included: (i) composite coating, that is, randomly distributed constituent phases; (ii) duplex coating with glass top layer onto HA layer; and (iii) graded coating with a gradual changing composition starting from pure HA at the interface with the metal substrate up to pure glass on the surface. The SPS was a suitable coating technique to produce all the coating designs. The SBF tests revealed that the presence of a pure glass layer on the working surface significantly improved the reactivity of the duplex and graded coatings, but the duplex coating suffered a relatively low scratch resistance because of residual stresses. The graded coating therefore provided the best compromise between mechanical reliability and apatite-forming ability in SBF
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Contributeur : Pamela Bathias <>
Soumis le : jeudi 13 février 2014 - 16:59:48
Dernière modification le : mardi 6 août 2019 - 09:02:16

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Andrea Cattini, D. Bellucci, Antonella Sola, Lech Pawlowski, Valeria Cannillo. Microstructural design of functionally graded coatings composed of suspension plasma sprayed hydroxyapatite and bioactive glass. Journal of Biomedical Materials Research Part B: Applied Biomaterials, Wiley, 2013, In press. ⟨10.1002/jbm.b.33034⟩. ⟨hal-00946600⟩

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