| As human requirements for high quality of life increasingly, the body types ofartificial joint replacement will be more and more, the accuracy requirements are alsoincreasing, so the huge market demands making the commitment of the key featuresof cervical artificial cervical disc joint prosthetic material must have high reliabilityprotection. Prosthetic materials currently used in clinical practice is still titanium alloy(Ti6Al4V)-based, it has excellent corrosion resistance, for MRI, CT interference issmaller, torsion and axial strength is closer to the bone, but the wear is poor. In thispaper, it uses ion implantation and diamond-like carbon (DLC) film couplingtechnique for surface modification of titanium, research organizations structure andtribological properties of the modified under different conditions.Different energy carbon ions into the titanium alloy, the surface of the detectorelement to which are C, N, O and Ti elements. When injecting a high dose of carbon,the surface of the sample with the presence of TiC, which makes larger the hardnessof the modified. The ion implantation is large, the more smooth and denser on thefilm.Increasing RF power, which leads to the gas source CH4and H2, successfullydeposited a certain thickness of DLC film on the surface of ion implanted Ti6Al4Valloy. Fine particle film that showing a uniform arrangement, characterized by arelatively dense micro-protrusion, and without cracks on the surface. Through Gaussfitting area integration for C1s binding energy peak of DLC films, it founds that thesp3C content of the prepared DLC films as high as59%. The hardness of the sampleis10GPa from Nano-mechanical testing. With the increase of the ion implantationenergy, the hardness increases.In ball-disc sliding friction experiment, changing load, Ti6Al4V alloy aftermodification DLC film compared to untreated Ti6Al4V alloy, with a low frictioncoefficient. In the process of sliding, untreated Ti6Al4V alloy produced plowing andplastic deformation, badly worn, and Ti6Al4V alloy after modification DLC filmoccur mainly fatigue spalling wear. In a smaller load, the coefficient of friction of ionimplantation and DLC film coupling on Ti6Al4V alloy is low. There’s furrow alongthe wear direction, but not too serious of the wear. In a bigger load, the larger carbonion implantation energy, the more excellent tribological properties of the coupling ofthe sample. In ball-waterloo twist friction experiment, T-θ curves of Ti6Al4V alloy is aprocess from oval to parallelogram, and the corresponding torsional fretting runningby the partial slip into full slip. When torsional fretting is in the part of slip zone, thetwisting movement of contact surface is coordinate by the elastic deformation whichthe two bodies contected. Contact surface is in sticky state, almost no relative slip,wear to adhesive wear. When torsional fretting is in mixing zone, the relative motioncan not be fully coordinated by elastic deformation, resulting in the occurrence ofplastic deformation, damage increased wear to fatigue wear. When the twist intocompletely slip zone, the material surface damage is very serious, and a largeaccumulation of debris, wear to abrasive wear. |
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