▎ 摘　　要

NOVELTY - Method comprises (a) cutting titanium alloy as substrate material, pre-processing the substrate by degreasing, acid cleaning, cleaning and drying, (b) preparing anode oxidation layer, and preparing sol including preparing ethanol solutions of calcium nitrate tetrahydrate and phosphorus pentoxide respectively according to calcium-phosphorus ratio as 1.67, aging for 12-15 hours, preparing graphene oxide ethanol dispersion and mixing with ethanol solution of phosphorus pentoxide, (d) slowly the mixed solution into ethanol solution of calcium nitrate tetrahydrate, adjusting pH to 8 using aqueous ammonia, magnetically stirring for 30-40 minutes, and then aging for 20-24 hours, and (e) placing the titanium alloy substrate on a spin coater, dropping sol on substrate surface, rotating for 30-45 seconds at 1200-1500 revolutions/minute, drying in vacuum drying box at 60-80 degrees C for 30-60 minutes, taking out and heating in a muffle furnace at 400-450 degrees C for 120-150 minutes. USE - The method is useful for preparing hydroxyapatite bioceramic on titanium alloy surface by sol-gel method. ADVANTAGE - The method enables preparation of hydroxyapatite biological ceramic having high corrosion resistance, and when the doping amount of phosphorus pentoxide is 6.3% in the sol, the self-corrosion current of the ceramic coating reduces to 5.28x 10-3 mu A/cm2.