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Method for enhancing bonding strength of cold spraying coating and base material

A technology of combining strength and cold spraying, which is applied in the field of material engineering, can solve the problems that complex shapes of workpieces are not suitable for the range of process parameters, difficulty in greatly improving the bonding strength, and inconsistent plastic deformation at the interface, so as to achieve wide adaptability of the combined shape of components, Improvement of bond strength, effect of bond strength improvement

Active Publication Date: 2022-02-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the impact velocity of particles can be significantly increased only when expensive helium is used as the accelerating gas, which is not economically scalable in most engineering settings
On the other hand, in the process of cold spraying, the higher the temperature of the metal material, the softer the material, and the easier it is to undergo plastic deformation. However, since the powder particles will be heated to a certain extent by the gas, and the substrate is usually cold, the particles are high-speed When hitting the substrate, the plastic strain of the particles is often larger than that of the substrate, the plastic deformation of the interface is inconsistent, and the bonding strength is difficult to be greatly improved
In this regard, there is currently a method of using a laser to soften the substrate in real time during the spraying process to improve the bonding strength. However, because the laser is very sensitive to the working distance, it is not suitable for workpieces with complex shapes and there are process parameters. Problems such as narrow scope, low work efficiency, and high cost of integrated equipment restrict its wide industrial application

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  • Method for enhancing bonding strength of cold spraying coating and base material
  • Method for enhancing bonding strength of cold spraying coating and base material
  • Method for enhancing bonding strength of cold spraying coating and base material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The 6061Al alloy powder with a particle size distribution of 10-70m is used as the coating material (i.e. the cold spray powder of the present application), and the AZ31B magnesium alloy is used as the base material, and the aluminum alloy coating is prepared on the surface of the AZ31B magnesium alloy by cold spraying to improve the magnesium alloy. Alloy corrosion resistance. Specifically, firstly, in an argon protective atmosphere, the 6061Al alloy powder was subjected to aging treatment at 170°C under the condition of argon blowing through a rotating electric heating furnace, and the holding time was 4 hours. When the temperature dropped below 50°C, the The powder after aging treatment is taken out from the furnace and vacuum-packed for use. Such as Figure 4a and 4b The comparison shows that after the aging heat treatment, nanoscale precipitates appeared inside the 6061Al alloy powder. The powder was embedded with epoxy glue to prepare metallographic cross-sectio...

Embodiment 2

[0067] Using 7075 hard aluminum alloy powder with a particle size distribution of 15-60m as the raw material of cold spray powder and 7075 hard aluminum alloy as the base material, the repair of cold spray coating in the field of nickel-based superalloy is simulated. Specifically, high-temperature nitrogen was used to perform solution treatment on the surface of the substrate three times, and the surface temperature during the treatment was 510°C. Micro-Vickers hardness tester was used to test the hardness of the substrate surface before and after treatment under the condition of load of 50g and holding time of 10s. The hardness test result showed that the surface hardness of the treated substrate decreased from 185HV to 127HV ,Such as Figure 6a As shown, the thickness of the softened layer is about 150-250m.

[0068] Laser cleaning is used to clean the oxide film on the surface of the substrate before coating preparation, and fine sand (60 mesh) is used for sandblasting tre...

Embodiment 3

[0072] Using Inconel 718 nickel-based superalloy powder with a particle size distribution of 10-50m as the raw material for cold spray powder, and using Inconel 718 nickel-based superalloy as the substrate, simulate the repair of cold spraying in the field of nickel-based superalloy. Specifically, firstly, under an argon protective atmosphere, mix Inconel 718 alloy with alumina powder, and perform aging treatment on the powder at 720°C for 1.5h. When the temperature drops below 50°C, the powder Take it out from the furnace and vacuum seal it for use. Such as Figure 7 As shown, a large number of precipitated phases appeared inside the powder after heat treatment. The powder was inlaid with epoxy glue to prepare a metallographic cross-section sample. The hardness test was carried out with the treated powder, and the hardness of the treated powder was increased from 345HV to 445HV.

[0073] The surface of the superalloy substrate is solid-solution treated with a laser. The las...

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Abstract

The invention discloses a method for enhancing bonding strength of a cold spraying coating and a base material, and relates to the technical field of material engineering. The method comprises the steps that scanning treatment is performed on the surface of the base material through a point heat source so that the hardness of the surface of the base material can be reduced till that no precipitated phase exists, and / or aging treatment is performed on the cold spraying powder; the second phase is separated out from the cold spraying powder so that the hardness of the cold spraying powder is improved; and finally, cold spraying is performed on the surface of the base material without the precipitated phase by using the common cold spraying powder, or cold spraying is performed on the surface of the base material by using the cold spraying powder with the second phase, or cold spraying is performed on the surface of the base material without the precipitated phase by using the cold spraying powder with the second phase. In this way, three schemes for enhancing the bonding strength of the cold spraying coating and the base material are achieved, and the purposes of improving the embedding depth when the powder particles impact the surface of the base material and improving the consistency of the plastic strain of the powder particles and the interface of the base material can be achieved.

Description

technical field [0001] The invention relates to the technical field of material engineering, in particular to a method for enhancing the bonding strength of a cold spray coating and a base material. Background technique [0002] Cold spraying is a material deposition technology that impacts the surface of the substrate through micron-sized metal or metal-based powder particles at high speed, and forms an effective combination with the substrate through the severe plastic deformation generated by the high-speed impact under completely solid conditions. Different from the characteristics of laser, flame, plasma, arc and other deposition materials that achieve material deposition through melting and solidification, cold spraying has the characteristics of solid-state and low-temperature material deposition, which makes it possible to avoid oxidation of metal deposition materials under atmospheric conditions, and at the same time avoid damage to substrates. thermal influence of ...

Claims

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Application Information

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IPC IPC(8): C23C24/04C22F1/04C22F1/10C22F1/08C22F1/02B22F1/142C23F17/00
CPCC23C24/04C22F1/04C22F1/10C22F1/08C22F1/02C23F17/00
Inventor 雒晓涛王雁鑫李长久
Owner XI AN JIAOTONG UNIV
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