BG/BG-FHA composite coatings prepared by electrophoretic deposition method

BG/BG-FHA composite coatings on the surface of Ti6Al4V alloy, which consist of a biological glass (BG) for the middle layer, BG and F doped hydroxyapatite (FHA) composite powder for the surface layer were prepared by electrophoretic deposition method. The phase composition, microstructure and adhesion of BG/BG-FHA composite coatings were analyzed by XRD, SEM, EDS and electronic universal material testing machine. The ameliorated heat-treatment process was obtained, and the in vitro biological activity was investigated by the soaking experiment in the simulated body fluid (SBF). The results show that a new phase Ti₃(PO₄)₄ is generated in the interface between BG and Ti6Al4V base alloy after the BG/BG-FHA composite coatings were heat-treated appropriately, and the binding mode of the interface is chemically metallurgical bonding, which is higher than 20 MPa. Optimized heat treatment processing parameters are as follows: heat treatment temperature 750 ℃, holding time 12 min and furnace cooling. The bone-like calcium deficiency apatite, which grows like petal with several hundred nanometers in length, forms on the surface of BG/BG-FHA coating after soaking, showing excellent biological activity.