A kind of degradable iron-based implant and preparation method thereof

Abstract

A degradable iron-based implant and a preparation method thereof. The implant is composed of an iron matrix and carbon nanotubes evenly distributed therein. The preparation steps are: taking carbon nanotubes and iron powder, and stirring mechanically under the protection of argon Mixing and ball milling followed by a selective laser melting process under argon protection resulted in a degradable iron-based implant. The beneficial effect of the present invention is that carbon nanotubes are used as cathodes for galvanic corrosion, and the degradation rate of the iron-based implant is greatly improved by utilizing its characteristics of high standard potential, good electrical conductivity and large specific surface area, and solves the problem of conventional Iron-based implants degrade too slowly, and the prepared iron-based implants can provide sufficient mechanical support, and the preparation method of the present invention can achieve uniform dispersion of carbon nanotubes in the iron matrix and maintain structural integrity , so as to give full play to its improvement effect on the degradation behavior of iron-based implants.

Description

Technical field[0001]The present invention belongs to the technical field of biomedical implants, and more particularly to a decomposed iron-based implant and a preparation method thereof.Background technique[0002]In recent years, degradable medical metals represented by iron-based alloys have become an important direction for the development of orthopedic implant. Such medical metals have cleverly utilize their corrosive characteristics in the human environment, and can achieve the purpose of gradually degrading the implant while repairing the defect tissue. It has changed non-degradable metals such as stainless steel, cobalt nickel alloy, titanium alloy. The practice of implant. At the same time, iron is one of the small amount of nutrient elements necessary for the human body. It can participate in the process of metabolism, DNA and RNA synthesis, play an important role in playing a variety of physiological functions in the human body. Therefore, iron-based alloys have potential ...

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Problems solved by technology

Factors affecting the degradation rate of galvanic couples mainly include potential difference, conductivity, and the number of galvanic couples. At present, some scholars have added high-potential noble metal elements Au (+1.83V), Ag (+0.7996V), Pt (+1.2V) etc., form a large potential difference with iron (-0.44V) to increase the galvanic degradation rate, thereby accelerating the degradation of iron, but these noble metal elements are not only expensive, but also have limited improvement and high biological toxicity; some scholars also use Co , Al, W, B, C, S and other elements form new compounds with the iron matrix, and galvanic corrosion is formed between the new compounds and the iron matrix to accelerate the degradation of iron, but the degradation rate of iron does not increase significantly, so There is still a big gap between the prepared iron-based implant and the clinical use requirements

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