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Surface anti-bacterial structure of substrate used in space environment and preparation method thereof

A technology of substrate surface and space environment, applied in the direction of surface reaction electrolytic coating, vacuum evaporation coating, metal material coating process, etc., can solve the corrosion of titanium and titanium alloy materials, shorten the life of spacecraft, and endanger astronauts Life and other problems, to achieve the effect of enhancing binding force, enhancing microbial corrosion resistance, and slowing down the release rate

Inactive Publication Date: 2020-04-28
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Abstract
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  • Claims
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Problems solved by technology

When the spacecraft is in a highly mutable environment without ground pressure, the mutation of some microorganisms will be accelerated, coupled with the humidity temperature, O 2 with CO 2 Factors such as gas components, volatile organic pollutants, and cabin odors (mercaptans, etc.), if not properly controlled, will promote the reproduction of microorganisms, and then cause corrosion to titanium and titanium alloy materials, thereby shortening the life of the spacecraft. even endanger the lives of astronauts

Method used

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  • Surface anti-bacterial structure of substrate used in space environment and preparation method thereof

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[0028] The preparation method of the silver-containing organosilicon compound particles is as follows: fully mix the organosilicon and silver-containing compound powders with a mixer, and press the mixed powder into a cake with a tablet machine to obtain the organosilicon and silver-containing compound particles. For composite particles of silver compound, the mass ratio of organosilicon to silver-containing compound is 1:0.3-3.

[0029] A method for preparing an antibacterial structure on the surface of a substrate for a space environment, the steps of the method comprising:

[0030] Step 1, polishing the surface of the substrate to a surface roughness R≤0.4 μm;

[0031] Step 2, performing electrochemical degreasing on the surface of the substrate;

[0032] Step 3, acid etching the surface of the substrate;

[0033] Step 4, anodizing the surface of the substrate to obtain titanium dioxide nanotubes on the surface of the substrate;

[0034] Step 5, placing the substrate wit...

Embodiment 1

[0042] The pure titanium and TC4 test pieces are sequentially used with 400 # 、600 # , 800 # 、1000 # , 1200 # , 1500 # , 2000 # Polished with terracotta paper, washed with distilled water. Bind the test piece with titanium wire and place it in sodium hydroxide (30-50) g / L, sodium carbonate (30-50) g / L, trisodium phosphate (20-30) g / L, sodium silicate (3 ~5) In the g / L electrochemical degreasing tank, set the solution temperature to 80°C and the current density to 5A / dm 2 , degreasing time 2min. Take the test piece out of the degreasing tank and rinse its surface with distilled water. Place the sample in the solution formula: 40% hydrofluoric acid 100ml / L, nitric acid 100ml / L mixed acid, soak at room temperature for 60s. Take the test piece out of the mixed acid solution and rinse its surface with distilled water. Place the test piece in a sulfuric acid solution with an electrolyte formula of 180-200g / L, set the solution temperature to -5°C, the oxidation voltage to 8...

Embodiment 2

[0044] The pure titanium and TC4 test pieces are sequentially used with 400 # 、600 # , 800 # 、1000 # , 1200 # , 1500 # , 2000 # Polished with terracotta paper, washed with distilled water. Bind the test piece with titanium wire and place it in sodium hydroxide (30-50) g / L, sodium carbonate (30-50) g / L, trisodium phosphate (20-30) g / L, sodium silicate (3 ~5) In the g / L electrochemical degreasing tank, set the solution temperature to 80°C and the current density to 5A / dm 2 , degreasing time 2min. Take the test piece out of the degreasing tank and rinse its surface with distilled water. Place the sample in the solution formula: 40% hydrofluoric acid 100ml / L, nitric acid 100ml / L mixed acid, soak at room temperature for 60s. Take the test piece out of the mixed acid solution and rinse its surface with distilled water. Place the test piece in a sulfuric acid solution with an electrolyte formula of 180-200g / L, set the solution temperature to -5°C, the oxidation voltage to 8...

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Abstract

The invention relates to a surface anti-bacterial structure of a substrate used in a space environment and a preparation method thereof, and belongs to the technical field of metal nanometer ion functional materials and application thereof. Titanium or titanium alloy is used as the substrate. By using a voltage-stabilization anodic oxidation method, a titanium dioxide nanotube array is prepared onthe surface of the titanium and titanium alloy. The method is simple, the efficiency of generating titanium dioxide nanotubes is high, the structure of the nanotubes obtained by using the method is regular, the specific surface area of the titanium and titanium alloy is increased, and therefore, the ability of the structure to support anti-bacterial ions is enhanced. Through an electron beam evaporation deposition technology, organosilicone-coated silver particles are deposited into the titanium dioxide nanotubes, and on the premise without affecting the mechanical property of the titanium and titanium alloy substrate, the microbiological corrosion resistance of the titanium and titanium alloy in the space environment is improved.

Description

technical field [0001] The invention relates to an antibacterial structure on the surface of a base material for a space environment and a preparation method thereof. The base material is titanium or a titanium alloy, and belongs to the technical field of metal nano-ion modified functional materials and their applications, in particular to silver-containing organosilicon The composite particles are deposited into the nanotube pores on the surface of the substrate. Background technique [0002] Titanium and titanium alloys are widely used in the aerospace field due to their light weight, high specific strength, good specific stiffness, corrosion resistance, and high temperature resistance. This material has a certain ability to resist biological corrosion, but it cannot resist long-term microbial corrosion. Limit its application in aerospace field. [0003] The space environment has some special environments that do not exist in the ground environment, including ion radiatio...

Claims

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Application Information

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IPC IPC(8): C25D11/26C23C14/30C23C14/06
CPCC23C14/06C23C14/30C25D11/26
Inventor 鞠鹏飞肖金涛陈妍李忠建孟引根
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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