Composite powder for preparing self-repairing coating, preparation method of composite powder, titanium-based wear-resistant self-repairing coating and preparation method of titanium-based wear-resistant self-repairing coating

A composite powder, self-healing technology, applied in nanotechnology, coating, metal material coating technology for materials and surface science, etc., can solve problems such as the inability to effectively improve the tribological properties of titanium-based composite materials

Active Publication Date: 2021-06-18
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing process of the above-mentioned materials requires high-temperature heating and the oxidation of air, so the self-healing function cannot be given to the material at room temperature or in a vacuum environment, and the tribological properties of titanium-based composites cannot be effectively improved.

Method used

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  • Composite powder for preparing self-repairing coating, preparation method of composite powder, titanium-based wear-resistant self-repairing coating and preparation method of titanium-based wear-resistant self-repairing coating
  • Composite powder for preparing self-repairing coating, preparation method of composite powder, titanium-based wear-resistant self-repairing coating and preparation method of titanium-based wear-resistant self-repairing coating
  • Composite powder for preparing self-repairing coating, preparation method of composite powder, titanium-based wear-resistant self-repairing coating and preparation method of titanium-based wear-resistant self-repairing coating

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Effect test

preparation example Construction

[0070] The present invention provides a kind of preparation method for the composite powder that is used for preparing self-healing coating, comprises the following steps:

[0071] a) mixing and ball milling powder, dispersant, nitrate solution and binder to obtain slurry;

[0072] b) spray drying the slurry to obtain Ti-LS-Al spherical composite powder;

[0073] c) performing chemical vapor deposition on the Ti-LS-Al spherical composite powder in a mixed gas environment of hydrocarbon gas, hydrogen and inert gas to obtain a carbon nanotube-coated Ti-LS-Al spherical composite powder;

[0074] Described powder comprises the component of following mass ratio:

[0075] Layered silicate mineral powder 1% to 6%;

[0076] Al powder 3% ~ 9%;

[0077] Ti powder balance;

[0078] The nitrates in the nitrate solution are iron nitrate, nickel nitrate and magnesium nitrate.

[0079] In the present invention, powder (layered silicate mineral powder, Al powder and Ti powder), nitrate s...

Embodiment 1

[0134] 1.1 Preparation of carbon nanotube-coated Ti-LS-Al spherical composite powder

[0135] S1, put the powder, absolute ethanol and nitrate solution into the ball milling jar of the planetary ball mill, add polyvinyl alcohol after ball milling for 2 hours and continue ball milling for 4 hours (using the ball milling jar and grinding balls of agate material, the ball-to-material ratio is 25: 1), obtain slurry.

[0136] in:

[0137] The powder includes: 1% attapulgite, 6% Al powder, and the balance of Ti powder.

[0138] Dehydrated alcohol is 100% of powder quality.

[0139] The nitrate solution is 80% of the powder mass, and the concentrations of iron nitrate, nickel nitrate and magnesium nitrate in the solution are all 0.7mol / L.

[0140] Polyvinyl alcohol is 15% of powder mass.

[0141] S2. Take out the slurry in the ball mill tank, spray dry and granulate with spray drying equipment. The conditions of the equipment are: inlet temperature 280°C, outlet temperature 110°C...

Embodiment 2

[0150] 1.1 Preparation of carbon nanotube-coated Ti-LS-Al spherical composite powder

[0151] Carry out as in Example 1, the difference is that the content of attapulgite is adjusted to 2%.

[0152] 1.2 Preparation of titanium-based wear-resistant self-healing coating: same as in Example 1.

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Abstract

The invention provides composite powder for preparing a self-repairing coating, a preparation method of the composite powder, a titanium-based wear-resistant self-repairing coating and a preparation method of the titanium-based wear-resistant self-repairing coating. The preparation method of the composite powder comprises the following steps: firstly, mixing powder materials (layer silicate mineral powder, Al powder and Ti powder), a nitrate solution, a dispersing agent and a binder, and performing ball milling to obtain slurry; secondly, carrying out spray drying to obtain spherical composite powder particles; and finally, performing chemical vapor deposition treatment in an environment containing carbon source gas to form a carbon nanotube coating layer on the surface of the spherical composite powder, thereby obtaining spherical composite powder coated with carbon nanotubes (namely CNT). The composite powder is used as a raw material, and the wear-resistant self-repairing coating is prepared on the surface of a metal matrix through the steps of matrix surface pretreatment, cold spraying, re-melting treatment, heat treatment and the like. The titanium-based wear-resistant self-repairing coating provided by the invention has high hardness and good wear resistance, and has a wear self-repairing function in oil lubrication, dry friction and vacuum environments.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a composite powder for preparing a self-repairing coating and a preparation method thereof, a titanium-based wear-resistant self-repairing coating and a preparation method thereof. Background technique [0002] Titanium alloys have high specific strength, excellent corrosion resistance, and good biocompatibility, and are widely used in aerospace, chemical, national defense equipment, and biomedicine. However, due to problems such as low hardness, poor load-carrying capacity, prone to adhesive wear failure, high friction coefficient, and high-speed friction flammability ("titanium fire" phenomenon), the large-scale application of titanium alloys as mechanical equipment friction parts is limited. Prepare high-performance titanium-based composite coatings on the surface of titanium alloys. By changing the surface morphology, chemical composition or structure, endow titaniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/02B22F1/00C23C16/26C23C16/50C23C24/04B82Y40/00B82Y30/00
CPCB22F9/026C23C16/26C23C16/4417C23C16/50C23C24/04B82Y40/00B82Y30/00B22F1/07B22F1/065B22F1/16B22F1/10
Inventor 于鹤龙王红美吉小超宋占永尹艳丽周新远魏敏史佩京张伟
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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