This study aims at revealing the dissolution behavior of individual calcium phosphate (CP) splats after incubation in simulated body fluid (SBF) over various periods. The CP splats were prepared using both plasma spraying and high velocity oxy-fuel (HVOF) technique. The in vitro dissolution rates (defined here as the ratio of dissolved area to overall area of a splat) together with the morphological changes of the splats indicated that the extent of hydroxyapatite (HA) transformation to other CP during plasma spraying was more extensive than during HVOF spraying. It was found that 2 hours of in vitro incubation resulted in complete dissolution of the plasma sprayed CP splats; whilst the dissolution rate of the HVOF sprayed CP splats significantly depended on the melt states. For fully melted HVOF splats, complete dissolution occurred after 4 hours' incubation. The present results further confirmed that HA decomposition predominantly occurred within the melted part of the sprayed particles. In other words, there could be a relationship between melt states of HA particles during the spraying and phase composition of the resultant splats. The temperatures of the sprayed HA particles were also measured before their impingement on the titanium alloy substrates prior to forming splats.
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