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Microstructural design of functionally graded coatings composed of suspension plasma sprayed hydroxyapatite and bioactive glass
Author(s) -
Cattini Andrea,
Bellucci Devis,
Sola Antonella,
Pawłowski Lech,
Cannillo Valeria
Publication year - 2014
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.33034
Subject(s) - materials science , coating , bioactive glass , composite material , scratch , simulated body fluid , microstructure , layer (electronics) , composite number , suspension (topology) , apatite , epoxy , chemical engineering , scanning electron microscope , mathematics , homotopy , pure mathematics , engineering
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.