Medical titanium disk as one of the most commonly used metal materials in the medical field, have long-term utility and safety in the physiological environment, showing a certain degree of corrosion and wear resistance, bioactivity and good biocompatibility in service. However, it has no antibacterial properties, is easily contaminated by the physiological environment, has a high surface friction factor, has a low resistance to plastic shear deformation and is prone to wear and failure, which can greatly reduce the service life of its medical parts.
In order to improve the surface properties of medical titanium products, ion implantation techniques are often used which can significantly improve surface properties with little change to the structure and organisation of the substrate. Nitrogen and carbon ion-injected modified layers are not tough enough under heavy load and do not have antimicrobial properties; silver and copper ion-injected layers have good antimicrobial properties; and magnesium ion-injection gives the implant bioactivity. Therefore, in order to balance the corrosion and wear resistance, antimicrobial properties and bioactivity of the ion-injected modified layers, metal and non-metal, metal and metal dual ion injection was carried out, and the dual ion-injected modified layers showed better performance than the single ion-injected modified layers. The ion concentration, the order and ratio of the dual ion injection, etc. determine the performance of the ion injection modified layers to a certain extent, but the current research still mainly adopts ion injection first, followed by relevant performance tests, i.e. lack of guiding theory.
Thus, the use of ion injection for medical titanium and its alloy modification, one will be towards the theory, simulation research, in order to use the theory and simulation results to guide the test; two will be towards multiple composite ions, not only limited to double ions, especially metal + metal + non-metallic ions, in order to combine the advantages of metal and non-metallic ion injection modified layer; three is to carry out in-depth ion injection equipment and the development of ion injection parameters on the corresponding equipment and optimization, in order to achieve the simultaneous injection of multiple composite ions, or the application of the proposed ion injection parameters to predict the performance of the ion injection modified layer, etc.
