Hydroxyapatite/titania composite bioactivity coating processed by sol–gel method

Hydroxyapatite/titania composite material was coated onto a titanium (pure Ti) substrate by sol–gel method. The hydroxyapatite (HA) and titania (TiO2) sol were made from precursor and mixed together. The insertion of TiO2 enhanced the chemical affinity and the physical consistency between HA and Ti substrate. The HA/TiO2 composite coating adhered tightly to the Ti substrate. Owing to the insertion of TiO2, the crystallinity of HA has been delayed. The specimens with HA/TiO2 composite coatings were soaked into SBF, and displayed good bone-like apatite forming ability. The bioactivity of the composite HA coatings were tested in vitro by cell culture.