Rare earth-hydroxyapatite composite biologically active film and preparation method thereof

Abstract

The invention relates to the means of active biological film on the surface of metal materials, especially the titanium radicel rare earth hydroxyapatite complex active biological film and the process for the manufacture. The differential arc oxidation technology is used in the method, the complex active biological film is generated in the surface of titanium and titanium alloy, a electrolyte solution with phosphate radical ion, calcium ion and rare earth ion is supplied; the titanium and titanium alloy is the anode and the rustless steel or the titanium is the cathode, the direct current power supply or the direct current impulsing power source is applied to differential arc oxygenize the titanium and titanium alloy; the oxidate deposit time is 3-60min; the temperature of electrolyte is not above 50DEG C. The film produced by the method which has perfect bioactivity, high conjugation, and stable chemical property can be the alternate material of several parts with heavy load to accelerate the postoperative healing, such as femur, hip joint and teeth root.

Description

technical field [0001] The invention relates to a method for preparing a bioactive film layer on the surface of a medical metal material, in particular to a titanium-based rare earth-hydroxyapatite composite bioactive film layer used for femurs, hip joints and tooth roots and a preparation method thereof. Background technique [0002] In recent years, the development and application of various biomedical materials have developed rapidly, among which metal materials were the first to be used. Metal biomaterials generally have high strength and toughness, and are suitable for hard tissue repair and fixation. Commonly used metallic biomaterials include cobalt injection. However, due to the surface hardness of titanium and titanium alloys, low-base alloys, tantalum, titanium and titanium alloys, etc., among them, titanium and its alloys have excellent corrosion resistance, high specific strength, good biocompatibility and are suitable for implantation. ...

AI Technical Summary

Problems solved by technology

Among them, the plasma spraying method uses hydroxyapatite powder, which is melted by high-temperature plasma to make the particles adhere to the substrate. Since the particles are easily volatilized after being heated at high temperature, the composition of the formed film is difficult to control.

The ion beam sputtering method is to prepare hydroxyapatite by ion beam sputtering, and the overall content of the film is difficult to control

Although the sol-gel method is easy to control the chemical composition and microstructure of the film, it requires post-treatment of high temperature annealing, which affects the properties of the matrix material

The micro-arc oxidation composite process generally has unfavorable factors such as increasing the complexity of the process and weakening the adhesion of the film layer; for example, micro-arc oxidation combined with hydrothermal treatment can transform and precipitate HA, but the bonding strength of the film layer is reduced by 40%; electrophoretic deposition uses electric field The effect makes HA deposited on the metal surface, but due to the loose combination, subsequent sintering treatment is required, which not only reduces the adhesion of the film layer, but also weakens the biological activity of the material during the sintering process