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Preparation method of cold spraying coating based on heat treatment aluminum alloy powder

An aluminum alloy, cold spray technology, applied in pressure inorganic powder coating and other directions, can solve the problem of coating strength and toughness constraints, and achieve the effect of improving comprehensive mechanical properties, improving plastic deformation ability, ensuring fluidity and low oxygen content

Active Publication Date: 2021-01-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the present invention regulates the plasticity of the alloy powder, improves the powder deposition efficiency, and reduces defects such as coating porosity, by adopting a method combining powder preheating treatment with the heating characteristics of cold spraying gas, realizing The dynamic recrystallization of the coating during the spraying process solves the problem of the mutual restriction of the strength and toughness of the coating

Method used

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  • Preparation method of cold spraying coating based on heat treatment aluminum alloy powder
  • Preparation method of cold spraying coating based on heat treatment aluminum alloy powder
  • Preparation method of cold spraying coating based on heat treatment aluminum alloy powder

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, the heat treatment method using 7075 aluminum alloy powder for cold spraying includes the following steps:

[0034] 1) Obtain 7075 aluminum alloy powder by gas atomization method.

[0035] Wherein, the proportion of the alloy powder with particle size less than or equal to 3 μm is less than or equal to 5%, the proportion of powder with particle size of 3 μm-60 μm is greater than or equal to 90%, and the proportion of powder with particle size of powder greater than or equal to 60 μm is less than or equal to 5%.

[0036] Powder cumulative particle size distribution D10≤6μm, D50≤23μm, D90≤50μm.

[0037] 2) Heat treatment of the powder: put the 7075 aluminum alloy powder into a tank and put it into a rotary heat treatment vacuum furnace, and vacuumize the furnace to 7×10 -3 Pa, with the furnace heating up to 120°C, the holding time is 1h, after the holding is over, high-purity argon is introduced to protect the powder, and it is air-cooled to room temp...

Embodiment 2

[0042] In this embodiment, the heat treatment method using 7075 aluminum alloy powder for cold spraying includes the following steps:

[0043] 1) Obtain 7075 aluminum alloy powder by gas atomization method.

[0044] Wherein, the proportion of the alloy powder with particle size less than or equal to 3 μm is less than or equal to 5%, the proportion of powder with particle size of 3 μm-60 μm is greater than or equal to 90%, and the proportion of powder with particle size of powder greater than or equal to 60 μm is less than or equal to 5%.

[0045] Powder cumulative particle size distribution D10≤6μm, D50≤23μm, D90≤50μm.

[0046] 2) Heat treatment of the powder: put the 7075 aluminum alloy powder into a tank and put it into a rotary heat treatment vacuum furnace, and vacuumize the furnace to 7×10 -3 Pa, with the furnace heating up to 140°C, the holding time is 1h, 4h, 8h, 12h, after the holding time is over, high-purity argon gas is introduced to protect the powder, and it is a...

Embodiment 3

[0051] In this embodiment, the heat treatment method using 7075 aluminum alloy powder for cold spraying includes the following steps:

[0052] 1) Obtain 7075 aluminum alloy powder by gas atomization method.

[0053] Wherein, the proportion of the alloy powder with particle size less than or equal to 3 μm is less than or equal to 5%, the proportion of powder with particle size of 3 μm-60 μm is greater than or equal to 90%, and the proportion of powder with particle size of powder greater than or equal to 60 μm is less than or equal to 5%.

[0054] Powder cumulative particle size distribution D10≤6μm, D50≤23μm, D90≤50μm.

[0055] 2) Heat treatment of the powder: put the 7075 aluminum alloy powder into a tank and put it into a rotary heat treatment vacuum furnace, and vacuumize the furnace to 7×10 -3 Pa, with the furnace heating up to 160°C, the holding time is 1h. After the holding time is over, high-purity argon gas is introduced to protect the powder, and it is air-cooled to ...

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Abstract

The invention discloses a preparation method of a cold spraying coating based on heat treatment aluminum alloy powder, and aims at solving the problems of low sedimentation rate, high strength of a spraying part and low toughness under the conventional cold spraying condition, and widening the application range and application value of a cold spraying technology. Specifically, the aluminum alloy powder is prepared through a gas atomization method, heat treatment is conducted on the aluminum alloy powder through a rotary heat treatment furnace, cold spraying forming is conducted on the powder obtained after heat treatment, and a cold spraying part is obtained. The strength and plasticity of the cold spraying part prepared through the heat treatment method can be obviously improved, the tensile strength can be improved by 48.6% to the maximum extent, and the elongation percentage can be improved by 114% to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of cold spray coating, in particular to a method for preparing a cold spray coating based on heat-treated aluminum alloy powder. Background technique [0002] Aviation equipment such as aircraft uses a large number of parts made of aluminum and magnesium alloys, which are prone to fatigue cracks and stress corrosion during long-term use, and require regular maintenance. During the overhaul of aviation equipment, due to the poor weldability of aluminum and magnesium alloys and the large welding heat input, it brings great difficulties to equipment maintenance. Due to the high porosity of the coating, poor corrosion resistance and oxidation resistance, thermal spraying repair technology is easy to cause thermal damage to the substrate, so it is not suitable for repairing aluminum and magnesium alloys. [0003] Cold spraying (Cold Spraying) technology is to use solid particles to form a coating through severe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08C22F1/02C22F1/04C23C24/04
CPCB22F9/082C22F1/02C22F1/04C23C24/04
Inventor 刘颖王仁全李军连利仙
Owner SICHUAN UNIV
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