Microstructural design of functionally graded coatings composed of suspension plasma sprayed hydroxyapatite and bioactive glass
Article first published online: 7 OCT 2013
Copyright © 2013 Wiley Periodicals, Inc.
Journal of Biomedical Materials Research Part B: Applied Biomaterials
Volume 102, Issue 3, pages 551–560, April 2014
How to Cite
How to cite this article: 2014. Microstructural design of functionally graded coatings composed of suspension plasma sprayed hydroxyapatite and bioactive glass. J Biomed Mater Res Part B 2014:102B:551–560., , , , .
- Issue published online: 6 MAR 2014
- Article first published online: 7 OCT 2013
- Manuscript Accepted: 28 AUG 2013
- Manuscript Received: 19 JUL 2013
- bioactive glass;
- calcium phosphate(s);
- in vitro
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.