Study On Magnesium-based Composite Functional Biofilms On Titanium Alloy Surface By Electron Beam Evaporative Deposition

In order to improve the application of titanium alloy in medical field,the magnesium-based composite functional biofilms with controlled release rate was prepared on the surface of titanium alloy by electron beam evaporation deposition technique.Magnesium doped organosilicon composite films were deposited by laser assisted electron beam evaporation.The films could be used on the surface of artificial joint implant to promote the proliferation and differentiation of bone tissue.The target materials of magnesium:Organosilicon mixture with different mass ratios were prepared.The effects of the target components and the film-making process on the composition and structure of the deposited films were investigated by electron beam,?=266 nm laser-assisted electron beam and?=532 nm laser-assisted electron beam evaporation.The composition and structure of the film were analyzed by FTIR and XPS,the formation mechanism of the film was explored,the morphology of the film was analyzed by scanning electron microscope?SEM?and transmission electron microscope?TEM?,the pH changes of the solution were measured by pH meter,the degradation kinetics of different films were investigated,and the corrosion resistance of the film was evaluated.It was found that the composite films deposited on the target of Mg+K42?1:1?evaporated by the laser-assisted electron beam at?=532 nm had the best corrosion resistance in normal saline solution.By rotating the position of the target,the multi-layer composite films of magnesium,calcium,phosphorus oxide and silicone resin were deposited with layer-by-layer in the same process.The effects of heat treatment temperature on the structure and properties of Mg-CaH₂ bilayer film,Mg-CaH₂-P₂O₅ three-layer film and Mg-CaH₂-P₂O₅-K42 four-layer film were studied.The composition and structure of the film were analyzed by FTIR and XPS,the formation mechanism of the film was explored,the morphology of the film was analyzed by SEM,the degradation kinetics of the film was measured by Tafel curve in simulated body fluid,and the corrosion resistance of the film was evaluated.The results show that in the simulated body fluid,the multi-layer composite film is helpful for bone growth,and the Mg-CaH₂-P₂O₅-K42 four-layer film after heat treatment on the surface of Ti-6Al-4V alloy has the best corrosion resistance.