Porous Nanostructured Hydroxyapatite Coatings Deposited by Suspension Plasma Spray

In this study, hydroxyapatite (HA) coatings were deposited on stainless steel by suspension plasma spraying. Coating samples and suspensions were examined by means of electron microscopy, XRD analysis, and FTIR and Raman spectroscopy. The results show that the coatings are porous and nanostructured with no impurity phases when low H₂ flow rates are used. They also contain a significant amount of OH^- and CO₃^2-, which facilitates the formation of well-crystallized HA and improves bioactivity and compatibility in implant applications.