Hydroxyapatite bioceramic coatings prepared by hydrothermal-electrochemical deposition method

The hydroxyapatite(HA) ceramic coating was successfully prepared on Ti6Al4V alloy by the hydrothermal-electrochemical deposition method with constant voltage model. The phases of deposits were analyzed by X-ray diffraction. The releationship between crystallinity and depositing temperature was discussed. The microstructures of hydroxyapatite coating were observed by scanning electron microscope. The experimental results showed that the phases, crystallinity and morphologies of deposits were influenced by depositing temperature (100 A degrees C, 120 A degrees C, 140 A degrees C, 160 A degrees C, 180 A degrees C and 200 A degrees C, respectively). The special hydrothermal environment can lower the crystallization temperature of HA. The crystallinity of HA increases firstly and then decreases with the increase of temperature. There is little hydroxyapatite deposited on the Ti6Al4V surface when the depositing temperature is 100 A degrees C. The HA deposition increases with the increase of the depositing temperature. And the HA morphologies are influenced by the depositing temperature.