Abstract
The effect of heat treatment was studied on plasma-sprayed hydroxyapatite (HA) coatings modified by addition of SiO 2, CaO, P 2O 5 and Na 2O. Morphological and chemical changes of these heat-treated coatings underwent in simulated body fluid (SBF) were also investigated. The results showed that during plasma spraying, P 2O 5 and SiO 2 enhanced the thermal decomposition of the HA structure, while CaO and Na 2O did not. Annealing of the coatings in air at 650 °C led to recrystallization of amorphous calcium phosphate and effectively increased the conversion of non-apatite phase (TCP) into apatite. The heat treatment also resulted in a reduction of ‘flake-type’ structures associated with plasma-sprayed coatings. When immersed in SBF, the SiO 2- and CaO-containing HA coatings did not show apatite precipitation in contrast to three other types of samples. That because of their TCP content showed the formation of apatite spherulites after 30-day immersion in SBF.
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