Microarc Oxidation Process And Properties Of Ti6Al4V Alloy Formed By Selective Laser Melting

Ti6Al4V alloy has been widely used in the field of orthopaedic implants,due to its good mechanical properties.However,the structural composition and chemical properties of Ti6Al4V are completely different from those of human bones,resulting in its poor biocompatibility compared with hydroxyapatite and other bioceramic materials.In order to improve the biocompatibility of the Ti6Al4V implants,this orthogonal experiment is made to explore the best component of electrolyte solution which used to modify Ti6Al4V implant produced by SLM(selective laser melting)by micro-arc oxidation technology.Further study focus on the effect of different electrical parameters on the morphology and performance of micro-arc oxidation film on 3d printing titanium alloy implants.In order to matche the Ti6Al4V implant to the bone structure,a porous Ti6Al4V product was designed,and the effect of different pore sizes and porosity on the microarc oxidation coating of porous Ti6Al4V was studied.On this basis,the microstructure,and composition of Ti6Al4V micro-arc oxidation coating under different processes were analyzed and studied by means of Scanning Electron Microscope(SEM),Energy Dispersive X-ray Spectroscopy(EDS),X-Ray Diffractometer(XRD)and X-Ray Photoelectron Spectroscopy(XPS).The bioactivity of the coating was tested by contact Angle measurement,simulated body fluid(SBF)immersion test and Fourier Transform Infrared Spectroscopyft-Ir(FT-IR).The results show that SLM Ti6Al4V has formed a coating with a certain proportion of calcium and phosphorus and a good combination with the substrate after micro-arc oxidation treatment.The main phase of coating is anatase.The coating thickness,calcium content,phosphorus content and anatase microstructure content increased with the increase of voltage.The coating prepared by 300 V voltage has the best quality,and its wettability is better than that of SLM Ti6Al4V matrix.After soaking the film in SBF solution for 35 days,the ratio of calcium and phosphorus increases from 0.73 to 1.2,and hydroxyapatite is generated.After micro-arc oxidation treatment,porous Ti6Al4V generates a relatively thin oxide layer.The film layer is evenly distributed in the pore structure,but the pore structure has little influence on the surface and section morphology of the coating.The biocompatibility test results showed that the hydrophilic properties of Ti6Al4V samples after micro-arc oxidation,the ability of inducing hydroxyapatite in SBF,the ability of protein adsorption,and the ability of cell proliferation were improved,making the Ti6Al4V implant formed by SLM have better biocompatibility.