Role of in-flight temperature and velocity of powder particles on plasma sprayed hydroxyapatite coating characteristics

► Process of HA coating deposition encompassing all production stages has been studied. ► Optimized procedure allowed production of pure HA with no TTCP or TCP content. ► principle of phase changes (HA → TTCP, HA → TCP) has been suggested. ► Roles of in-ight properties were identified with respect to coating characteristics.