PMID: 15348759Apr 1, 1997Paper

Plasma spraying of zirconia-reinforced hydroxyapatite composite coatings on titanium: part I: phase, microstructure and bonding strength

Journal of Materials Science. Materials in Medicine
E ChangC Y Yang

Abstract

Plasma-sprayed hydroxyapatite (HA) coatings applied to metal substrates can induce a direct chemical bond with bone and hence achieve biological fixation of the implant. However, the poor bonding strength between HA and substrate has been of concern to orthopaedists. In this study, two submicrometre ZrO2 powders stabilized with both 3 and 8 mol% Y2O3 (TZ3Y and TZ8Y, respectively) were incorporated in a plasma-sprayed HA coating on Ti-6Al-4V substrate to investigate the change in phase, microstructure and bonding strength. The results show that ZrO2 composite coatings contain more unmelted particles and greater porosity. During plasma spraying, ZrO2 reacts with the CaO in HA to form CaZrO3 and accelerates HA decomposition to alpha-TCP and Ca4P2O9. Nevertheless, bonding strength increases with increase of ZrO2 content in the range 0 to 10 wt% studied. The higher Y2O3-containing TZ8Y apparently exerts a greater strengthening effect than the lower Y2O3-containing TZ3Y.

Citations

Oct 6, 2015·BioMed Research International·A JematY Otsuka
Feb 5, 2015·Journal of Materials Science. Materials in Medicine·Quan-ming ZhaoDe-hong Feng
Aug 16, 2001·Journal of Biomedical Materials Research·L SunA Kucuk
Dec 26, 2015·Journal of Functional Biomaterials·Mythili PrakasamLiga Berzina-Cimdina
Sep 17, 2004·Journal of Biomedical Materials Research. Part a·E GyörgyJ Werckman

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