Bioactive film on titanium metal surface and its sand blasting-micro arc oxidizing compounding process

A bioactive, micro-arc oxidation technology, used in surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve the problems of difficult to control the overall content of the film, the reduction of the bonding strength of the film layer, and the impact on the performance of the matrix material, and achieve stable Optimizing properties and biological activity, improving surface roughness, and the effect of good biological activity

Inactive Publication Date: 2007-06-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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
Simple surface modification prepares bioactive coatings, although the phase composition of the material surface is changed, but it is lacking in improving the roughness of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using 25μmAl 2 O3 Sandblast the titanium. Use distilled water to prepare a solution containing 0.01 mol / L of sodium phosphate, 0.01 mol / L of β-glycerophosphate and 0.5 mol / L of calcium acetate. Using sandblasted pretreated titanium as the anode and stainless steel or titanium as the cathode, micro-arc oxidation is carried out with a DC power supply. The voltage is 300-500V; keep the temperature of the electrolyte not higher than 50℃. Micro-arc oxidation was carried out for 5 minutes, and a porous layer with a thickness of about 20 μm was formed on the surface of titanium; X-ray diffraction analysis showed that the film was mainly composed of hydroxyapatite; the surface roughness of the film measured Ra=2.1 μm; The binding strength is 43MPa, and it has good biological activity.

Embodiment 2

[0027] The titanium alloy was sandblasted with 75 μm SiC. Use distilled water to prepare a solution containing β-glycerophosphate sodium 0.15mol / L and calcium chloride 0.3mol / L. Using sandblasted titanium alloy as anode and stainless steel or titanium as cathode, DC power supply is used for micro-arc oxidation. The voltage is 200-400V; keep the temperature of the electrolyte not higher than 50℃. Micro-arc oxidation was carried out for 30 minutes, and a porous layer with a thickness of about 33 μm was formed on the surface of titanium; X-ray diffraction analysis showed that the film was mainly composed of hydroxyapatite; the roughness of the film measured by the surface profiler was Ra=2.9 μm; The strength is 37MPa, and it has good biological activity.

Embodiment 3

[0029] Using 125μmTiO 2 Sandblast the titanium alloy. Use distilled water to prepare a solution containing 0.02 mol / L of sodium dihydrogen phosphate and 0.2 mol / L of calcium nitrate. Using sandblasted titanium alloy as anode and stainless steel or titanium as cathode, DC pulse power supply is used for micro-arc oxidation. The voltage is 250-450V, the frequency is 300Hz, and the duty cycle is 60%; the temperature of the electrolyte is kept at 30-50°C. The oxidation deposition time was 60min; a porous layer with a thickness of about 28 μm was formed on the surface of titanium; X-ray diffraction analysis showed that the film was mainly composed of hydroxyapatite; the surface roughness of the film measured Ra=3.6 μm; The binding strength is 33MPa, and it has good biological activity.

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Abstract

The present invention relates to film on the surface of medical titanium-base metal material and its sand blasting-micro arc oxidizing compounding process. Through the first surface sand blasting treatment of titanium or titanium alloy material and the subsequent micro arc oxidizing in electrolyte solution containing phosphate radical ion and calcium ion and with the titanium or titanium alloy material as anode, stainless steel or titanium as cathode and DC power source or DC pulse power source, one bioactive film is in-situ formed on the surface of the titanium or titanium alloy material. The bioactive film of rough porous hydroxyapatite has surface roughness Ra of 2-4.5 micron, no interface with the substrate, elastic modulus reaching that of bone and excellent bioactivity, and may be used as the substitute for femur, hip joint, tooth root, etc. The bioactive film has optimized combination strength, stability and bioactivity.

Description

technical field [0001] The invention relates to a method for preparing a bioactive film layer on the surface of medical metal materials, in particular to a titanium metal surface bioactive film layer used for femur, hip joint and tooth root and its sandblasting-micro-arc oxidation composite process. 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 metal biomaterials include cobalt-based alloys, tantalum, titanium and titanium alloys. Among them, titanium and its alloys are widely used for their excellent corrosion resistance, high specific strength, good biocompatibility and suitability for implantation. attention. However, due to the low surface hardness and poor wear resistance of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 王迎军黄勇宁成云马强赵娜如
Owner SOUTH CHINA UNIV OF TECH
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