Titanium dioxide-hydroxyapatite gradient coating of medical titanium or titanium alloy surface and preparation method

A technology of hydroxyapatite and titanium dioxide, which is applied in metal material coating technology, coating, medical science, etc., can solve the problems of easy peeling off of the coating, low bonding strength between the coating and the substrate, etc., so as to improve the bonding performance and improve the The effect of peeling coating

Inactive Publication Date: 2012-01-25
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sol-gel method is widely used in the preparation of coatings; however, a major problem in this method is that the bonding strength between the coating and the substrate is low, and the coating is easy to fall off

Method used

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  • Titanium dioxide-hydroxyapatite gradient coating of medical titanium or titanium alloy surface and preparation method
  • Titanium dioxide-hydroxyapatite gradient coating of medical titanium or titanium alloy surface and preparation method
  • Titanium dioxide-hydroxyapatite gradient coating of medical titanium or titanium alloy surface and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of a titanium dioxide-hydroxyapatite gradient coating on the surface of a titanium alloy, specifically comprising the steps of:

[0044] (1) Surface pretreatment of the titanium alloy, grinding and polishing the surface with No. 200, No. 400, No. 600, and No. 800 sandpaper in sequence, and then cleaning and drying;

[0045] (2) Prepare 0.1mol / L calcium acetate aqueous solution and 0.02mol / L sodium dihydrogen phosphate aqueous solution. According to the volume ratio, calcium acetate aqueous solution: sodium dihydrogen phosphate aqueous solution is mixed at 1:1 to make an electrolyte;

[0046] (3) With the titanium alloy pretreated in step (1) as the anode and the metal stainless steel as the cathode, place the titanium alloy in the electrolyte obtained in step (2), and use a DC pulse power supply with a constant voltage of 460V for 5 minutes micro-arc oxidation treatment;

[0047] (4) Using calcium nitrate and triethyl phosphate as precursors, hydro...

Embodiment 2

[0055] A preparation method of a titanium dioxide-hydroxyapatite gradient coating on the surface of a titanium alloy, specifically comprising the steps of:

[0056] (1) Surface pretreatment of the titanium alloy, grinding and polishing the surface with No. 200, No. 400, No. 600, and No. 800 sandpaper in sequence, and then cleaning and drying;

[0057] (2) Prepare 0.5mol / L calcium acetate aqueous solution and 0.1mol / L sodium dihydrogen phosphate aqueous solution. According to the volume ratio, calcium acetate aqueous solution: sodium dihydrogen phosphate aqueous solution is mixed at 1:1 to make electrolyte;

[0058] (3) With the titanium alloy pretreated in step (1) as the anode and the metal stainless steel as the cathode, place the titanium alloy in the electrolyte obtained in step (2), and use a DC pulse power supply with a constant voltage of 400V for 20 minutes micro-arc oxidation treatment;

[0059] (4) Using calcium nitrate and triethyl phosphate as precursors, the hydr...

Embodiment 3

[0064] A preparation method of a titanium dioxide-hydroxyapatite gradient coating on the surface of a titanium alloy, specifically comprising the steps of:

[0065] (1) Surface pretreatment of the titanium alloy, grinding and polishing the surface with No. 200, No. 400, No. 600, and No. 800 sandpaper in sequence, and then cleaning and drying;

[0066] (2) Prepare 0.5mol / L calcium acetate aqueous solution and 0.1mol / L sodium dihydrogen phosphate aqueous solution. According to the volume ratio, calcium acetate aqueous solution: sodium dihydrogen phosphate aqueous solution is mixed at 1:1 to make electrolyte;

[0067] (3) With the titanium alloy pretreated in step (1) as the anode and the metal stainless steel as the cathode, place the titanium alloy in the electrolyte obtained in step (2), and use a DC pulse power supply with a constant voltage of 500V for 5 minutes micro-arc oxidation treatment;

[0068] (4) Using calcium nitrate and triethyl phosphate as precursors, hydroxyap...

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Abstract

The invention discloses a titanium dioxide-hydroxyapatite gradient coating of a medical titanium or titanium alloy surface and a preparation method. The inner layer of the titanium dioxide-hydroxyapatite gradient coating is a composite layer of the titanium dioxide and the hydroxyapatite while the outer layer of the titanium dioxide-hydroxyapatite gradient coating is a hydroxyapatite coating. The preparation method comprises the following steps of: using titanium or titanium alloy as anode and metal stainless steel as cathode; carrying out microarc oxidation on the titanium or titanium alloy by using a direct current pulse power supply; after forming a porous structure containing titanium dioxide and amorphous calcium and phosphorus on the surface of the titanium or titanium alloy, coating the hydroxyapatite on the surface; and finally obtaining the titanium dioxide-hydroxyapatite gradient coating. The porous structure formed after the microarc oxidation is beneficial for improving the bonding strength of a titanium or titanium alloy substrate and the costing; the titanium dioxide layer formed by the microarc oxidation has a transitional effect on the performance so that the residual stress between the substrate and a hydroxyapatite bioactive coating can be reduced. The preparation method has the advantages of simplicity and convenience in operation.

Description

technical field [0001] The invention belongs to a composite method for preparing a bioactive coating on the surface of medical titanium or titanium alloy, in particular to a titanium dioxide-hydroxyapatite gradient coating on the surface of medical titanium or titanium alloy and a preparation method thereof. Background technique [0002] Titanium or titanium alloy has excellent mechanical properties such as light weight, low elastic modulus, good biocompatibility, high corrosion resistance and good combination with organisms, etc., and is currently the most attractive metal biomaterials. However, titanium or titanium alloys are implanted in the body as biologically inert materials, which are completely different from the composition of natural bone. There is only a mechanical embedded osseointegration between them and the bone, rather than a strong chemical osseointegration, so it is necessary to Bioactive modification of titanium and its alloys. Preparation of bioactive c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04A61L27/06A61L27/32A61L27/42
Inventor 何代华刘平陈小红刘新宽马凤仓李伟
Owner UNIV OF SHANGHAI FOR SCI & TECH
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