Lanthanum contained hydroxyapatite coatings prepared by micro-arc oxidation

Porous lanthanum-contained hydroxyapatite coatings on commercially pure titanium substrate are prepared by micro-arc oxidation (MAO) in electrolytic solution containing 0.2 mol/L calcium acetate, 0.02 mol/L beta-glycerol phosphate disodium salt pentahydrate (beta-GP) and lanthanum nitrate with different concentrations. The thickness, phase, composition morphology, tensile strength and biocompatibility of the coatings are characterized by X-ray diffraction (XRD), electron probe microanalysis (EPMA) scanning electron microscopy (SEM) with energy dispersive X-ray spectrometer (EDS) and cell culture. It is found that the thickness of MAO coatings decreases and the contents of La on the coatings and the tensile strength of coatings increase as the concentrations of La in electrolyte increasing. The XRD and EDS results show that the porous coating is made of La-contained HA film. The favorable osteoblast cell affinity makes the La-HA film suitable for the implants of cell.