Abstract: SBF test and cell culture in vitro were carried out to evaluate the biological properties of plasma sprayed HA/Ti composite coatings.
Results obtained show that the coating surfaces will be covered by carbonate-apatite layer after being immersed in SBF for 1 day, which indicate that the composite coatings possess good bioactivity.
Carbonate-apatite layer is inclined to form on the rougher coating surface. Low concentration and high pH value of SBF are harmful to
the formation of carbonate-apatite layer. Excellent biocompatibility of the composite coatings can be confirmed by osteoblasts attaching firmly
and growing well on the coating surface.

Key words: hydroxyapatite coating, HA/Ti composite coating, SBF test, cell culture