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A process for preparing porous structure on the surface of tc4 titanium alloy by electrochemical dealloying

A technology of porous structure and dealloying method, which is applied in the field of biomedical materials, can solve problems such as insufficient surface osteogenic activity, poor internal osseointegration, human injury, etc., and achieve good induction of bone regeneration, improvement of osseointegration performance, and avoiding shedding Effect

Active Publication Date: 2022-08-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The disadvantage of using structuring technology (micro-arc oxidation and anodic oxidation) on the surface of the existing TC4 titanium alloy is that the coating is a porous structure obtained by growing the substrate upwards, which is an "additive" coating, and there is an obvious gap between the coating and the substrate. Interface, the combination is not strong; secondly, the surface contains harmful elements Al and V, which slowly dissolve after implantation into the human body, which will cause damage to the human body; insufficient surface osteogenic activity leads to poor osseointegration in the body after implantation, and eventually leads to implantation failure

Method used

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  • A process for preparing porous structure on the surface of tc4 titanium alloy by electrochemical dealloying
  • A process for preparing porous structure on the surface of tc4 titanium alloy by electrochemical dealloying
  • A process for preparing porous structure on the surface of tc4 titanium alloy by electrochemical dealloying

Examples

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Effect test

Embodiment 1

[0037] Step 1. Add 10 mL of concentrated nitric acid solution with a mass concentration of 68% into 400 mL of deionized water, stir and mix, then add 5 mL of hydrogen peroxide with a mass concentration of 30%, stir and mix, and then add 85 mL of deionized water to prepare a mixed solution ;

[0038] Step 2: Polish the TC4 titanium alloy with a specification of 10mm×10mm×1mm (length×width×thickness) with 800#, 1000#, 1500# and 2000# sandpaper in turn until the surface has no obvious scratches visible to the naked eye, Then, acetone, ethanol and deionized water were used for ultrasonic cleaning for 15 min respectively, and then placed in an oven for drying at 60° C. for 30 min, and vacuum sealed for use; the acetone and ethanol were both analytically pure reagents;

[0039] Step 3. The mixed solution obtained in step 1 is placed in an electrochemical device as an electrolyte, the TC4 titanium alloy after drying in step 2 is placed in the electrolyte as an anode, a platinum elect...

Embodiment 2

[0058] The difference between this example and Example 1 is that: in step 1, 5 mL of concentrated nitric acid solution with a mass concentration of 68% was added to 492 mL of deionized water and stirred and mixed, and then 3 mL of hydrogen peroxide with a mass concentration of 30% was added and stirred and mixed. ; The corrosion voltage used in the electrochemical dealloying treatment in step 3 is 1.0V, the time is 45min, the micron-scale pores with a pore diameter of 300 μm are formed on the surface of the TC4 titanium alloy, and the thickness of the porous structure in the TC4 titanium alloy with a porous structure on the surface is formed. is 2 μm.

Embodiment 3

[0060] The difference between this example and Example 1 is that: in step 1, 10 mL of concentrated nitric acid solution with a mass concentration of 68% was added to 487.5 mL of deionized water, stirred and mixed, and then 2.5 mL of hydrogen peroxide with a mass concentration of 30% was added and stirred Mix well; in step 3, the corrosion voltage used in the electrochemical de-alloying treatment is 1.0V, and the time is 60min, and a micron-scale porous structure with a pore diameter of 400 μm is formed on the surface of the TC4 titanium alloy, and the surface has a porous structure in the TC4 titanium alloy. The thickness is 2 μm.

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Abstract

The invention discloses a process for preparing a porous structure on the surface of a TC4 titanium alloy by an electrochemical dealloying method, comprising the following steps: first, adding concentrated nitric acid solution and hydrogen peroxide into deionized water to prepare a mixed solution; After the alloy is polished, it is cleaned and dried; 3. The TC4 titanium alloy after drying is electrochemically de-alloyed by using the mixed solution as an electrolyte to obtain a TC4 titanium alloy with a porous structure on the surface. The invention adopts electrochemical dealloying method to effectively remove relatively active Al and V in the surface layer of TC4 titanium alloy, forms an integrated porous structure on the surface of TC4 titanium alloy, avoids the bonding interface between the porous structure and TC4 titanium alloy, and improves the porous structure. The stability of TC4 titanium alloy avoids the dissolution of harmful elements Al and V in the subsequent use process, so that the safety of biological implantation of TC4 titanium alloy with porous structure on the surface of the final product is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of biomedical materials, in particular to a process for preparing a porous structure on the surface of a TC4 titanium alloy by an electrochemical dealloying method. Background technique [0002] With the aging of the population in China, frequent natural disasters, traffic accidents and sports injuries resulting in the increase of cases of human joint and bone tissue damage, people's demand for biomedical materials is increasing. The biomedical metal titanium alloy material mainly composed of TC4 titanium alloy has become the main biomedical material with a large amount and a wide range of clinical use due to its excellent properties such as high strength and toughness, fatigue resistance, easy processing and high reliability. Although TC4 titanium alloy has excellent biocompatibility and comprehensive mechanical properties, it is still a biologically inert material and has no biological activity and osteoin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/08C25F7/00A61L27/06A61L27/56
CPCC25F3/08C25F7/00A61L27/06A61L27/56A61L2430/02
Inventor 周文昊余森荆磊刘汉源白天
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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