Fig. 1. Composition and microstructure of silver-hydroxyapatite (Ag/HA) composite coating. A: the XRD spectrum; B: the EDS spectrum; C: the SEM image (the inset is the magnification of the rectangle). B and C are the EDS spectrum and SEM images of Ag/HA composite coating. The main elements of the composite coating are calcium, phosphorus, silver and oxygen (B). The coating is uniform in the nanoparticles and covers the titanium substrate, which is similar to approximate ball (C). The size of the particles is 100 ~ 300 nm from the photo of local magnification of the composite coating (C). The results show that the distribution of Ag particles in the Ag/HA composite coating is more uniform.