Bioceramic coatings: state-of-the-art and recent development trends
Heimann, Robert B.; Anh Vu, T.; Wayman, Michael L.
European Journal of Mineralogy Volume 9 Number 3 (1997), p. 597 - 616
published: Jun 2, 1997
manuscript accepted: Oct 21, 1996
manuscript received: Nov 16, 1995
ArtNo. ESP147050903008, Price: 29.00 €
Abstract Functional bioceramic calcium phosphate thin films and thick coatings have been applied by a wide range of techniques to load-bearing metallic substrates ofbiomedical implants. In particular, research and development into bioceramic hydroxylapatite (HAp; Ca10(PO4)6(OH)2) coatings applied by plasma spray techniques show that the microstructure, cohesion and adhesion strength, and the in vivo resorption resistance of such coatings can be optimized by selecting appropriate plasma parameters. Since the functionality of a coating system depends to a large extent on the chemical and phase compositions at the substrate/coating interface, proper engineering of its microstructure is of paramount importance for the long-term stability of the bioceramic coating. Dense, highly crystalline, and phase-pure HAp coatings show maximum mechanical and biochemical stability in the very corrosive body environment. As a consequence, the plasma spray parameters and hence the microstructure of the deposited coatings need to be optimized by controlling the heat transfer from the plasma to the particles. In this paper, ways will be pointed out to potentially improve the properties and thus the in vivo performance of plasmasprayed HAp coatings including their adhesion strength and resorption resistance.