Ag-TiN Thin Films Deposited On Magnetron Sputtered Ti-6Al-4V Surface And Their Properties

Titanium alloy has excellent mechanical properties,physical and chemical properties,as implants are widely used in clinical surgery.However,the titanium alloy has poor wear resistance,and the abrasive debris generated by friction can cause inflammation and cause toxic and side effects on the human body;the titanium alloy does not have antibacterial properties,which can easily cause microbial infections and lead to implant failure,causing pain and economic burden for patients.In order to improve the antibacterial properties and wear resistance of titanium alloys,Ag-TiN ceramics with good antibacterial properties and wear resistance were prepared by using magnetron sputtering technology on the surface of titanium alloy with silver and titanium nitride inlaid targets Floor.First,select appropriate sputtering process parameters for the preparation of Ag-TiN thin film,and then use metallographic microscope,SEM,EDS,XRD to characterize and analyze the coating structure,composition and surface phase,and experimentally study the friction of the sample coating The wear performance,binding performance,antibacterial performance,and Abaqus simulation analysis of the plating scratch failure mechanism.The main conclusions are as follows:(1)Using magnetron sputtering technology to control different powers,a uniform and dense Ag-TiN coating was prepared on the surface of titanium alloy.Samples X1,X2 and X3 with silver content of 50.97%,70.42% and 91.25% were prepared by controlling different sputtering power on the surface of titanium alloy.The main phases of the coating were Ag,TiN and Ti O2.(2)The samples X1,X2,X3 after magnetron sputtering treatment have improved wear resistance,of which sample X2 has the best wear resistance.After treatment with the intermediate transition layer of the Ti target,the strength of the bonding force between the Ag-TiN film and the matrix material is improved,and the bonding strength of sample X2 is preferably 20.5N.(3)Samples modified by magnetron sputtering showed excellent antibacterial properties against Escherichia coli and Staphylococcus aureus.Its antibacterial properties are mainly provided by two aspects:(1)The silver alloy antibacterial phase is chromatographed on the surface of the titanium alloy,and the silver active particles exist in the aqueous solution in the ionic state,thereby showing the antibacterial properties;(2)Ag particles and Ti particles on the coating surface Photocatalytic sterilization performance under light conditions.(4)Simulation analysis shows that the failure mechanism of the coating is as follows:(1)The residual stress will be generated during the preparation of the film.Under the action of compressive stress,the elastic strain energy in the film is gradually released,which causes the film base structure to buckle and cause the film surface to crack.(2)The membrane-based system produces stress concentration near the indenter,which initiates cracks in the membrane layer and promotes its expansion.(3)During the scratching process,the film is subject to alternating shear tensile stress and shear compressive stress,which can easily lead to fatigue fracture of the film.In addition,the cracks germinated on the surface of the film continue to expand in the direction of transverse shear tensile stress.When the shear tensile force value exceeds the film When the shear strength is reached,the film peels off from the substrate and fails.