Abstract
Micro-plasma spraying was used to fabricate HA coatings on Ti-6Al-4V substrate. The coating phase distribution significantly changed throughout the coating depth. Crystalline HA, ACP and ß-TCP were observed near the coating-substrate interface. However, HA content increased with increasing distance from interface, and it was ~90% at top surface of the coating (>40μm) according to micro-Raman analysis. Columnar structure was found in such region, which was related to a strong (002) crystallographic texture. In addition, dissolution behavior of the coating was evaluated by immersing the material in balanced salt solution for 14 days. The study revealed that HA coating exhibited superior chemical stability, and the columnar structure emerged on the surface of the coating during immersion experiment.
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