title: 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. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 102B: 551-560, 2014.
authors.affiliation: Department of Engineering "Enzo Ferrari,", University of Modena and Reggio Emilia, Via Vignolese, 905 - 41125, Modena (MO), Italy; SPCTS, UMR CNRS 7315, University of Limoges, F-87068, Limoges, France.
authors.forename: Andrea
authors.initials: A
authors.lastname: Cattini
authors.forename: Devis
authors.initials: D
authors.lastname: Bellucci
authors.forename: Antonella
authors.initials: A
authors.lastname: Sola
authors.forename: Lech
authors.initials: L
authors.lastname: Pawłowski
authors.forename: Valeria
authors.initials: V
authors.lastname: Cannillo
mesh_terms: D002130:Calcium Phosphates / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D005740:Gases; D005898:Glass / Q000737:chemistry*; D006820:Hyaluronic Acid / Q000737:chemistry; D007202:Indicators and Reagents; D008855:Microscopy, Electron, Scanning; D011208:Powders; D012828:Silicones / Q000737:chemistry; D013499:Surface Properties; D013535:Suspensions; D014961:X-Ray Diffraction
chemical_list: D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D005740:Gases; D007202:Indicators and Reagents; D011208:Powders; D012828:Silicones; D013535:Suspensions; D006820:Hyaluronic Acid; D017886:Durapatite
keywords: bioactive glass; calcium phosphate(s); in vitro