Cold spraying forming method of Cu-Cr-Nb series alloy

A cu-cr-nb, cold spray technology, applied in pressure inorganic powder coating and other directions, can solve the problems of difficult to effectively inhibit the efficient production of Cr2Nb, limit the application and promotion of materials, and the growth of Nb phase particles, so as to eliminate interface defects. , Coating thickness is not limited, the effect of tissue optimization

Pending Publication Date: 2022-07-22
KUNMING METALLURGY INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current technologies such as hot isostatic pressing and vacuum plasma spraying use relatively high temperatures, which will still cause some Cr 2 Nb phase particle growth
In addition, the current solidification process of Cu-Cr-Nb powder such as hot isostatic pressing and vacuum plasma spraying has high cost and low efficiency, which limits the application and promotion of this type of material
[0003] In the patents CN111440963B, CN112553500A, and CN110218897A, the Cu-Cr-Nb alloy powder is prepared by the aerosol method, and then the alloy is prepared by hot pressing, SPS and other processes. The solidification temperature of the powder is higher than 800°C, and Cr 2 Coarsening of the Nb phase reduces the properties of the alloy
In addition, the cost of the above methods is high and the production efficiency is low.
There are certain technical defects in the current preparation methods of Cu-Cr-Nb alloys, and it is difficult to effectively suppress Cr 2 Coarsening of the Nb phase and enabling high-efficiency production

Method used

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  • Cold spraying forming method of Cu-Cr-Nb series alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The Cu-Cr-Nb series alloy cold spray preparation method of this embodiment includes the following steps:

[0025] (1) The atomic percentage composition is selected as Cu-4at.%Cr-2at.%Nb, the particle size is 25μm, Cr 2 Powders with Nb phase size less than 5μm were dried in a vacuum drying oven at 80°C for 30min to obtain cold spray powder raw materials; electrolytic copper plates treated by sandblasting after cold rolling were selected as the base material, and the base material was fixed on a rotating shaft with a speed of 120rpm superior.

[0026] Step 2, spraying the Cu-Cr-Nb powder onto the base material by using a cold spraying device to obtain a Cu-Cr-Nb sprayed layer. The process parameters of cold spraying are: the carrier gas is compressed air, the carrier gas pressure is 3MPa, the preheating temperature is 420℃, the distance between the surface of the base material and the nozzle outlet of the spray gun is 50mm, and the spray gun moves up and down at a moving...

Embodiment 2

[0030] The Cu-Cr-Nb series alloy cold spray preparation method of this embodiment includes the following steps:

[0031] (1) Select the atomic percentage composition as Cu-8at.%Cr-4at.%Nb, the particle size is 50μm, Cr 2 The powder with Nb phase size of 2-5μm was dried in a vacuum drying oven at 90 °C for 20 minutes to obtain the cold spray powder raw material; the electrolytic copper cylinder after cold rolling and sandblasting was used as the base material, and the base material was fixed at 150rpm. on the axis of rotation.

[0032] Step 2, spraying the Cu-Cr-Nb powder onto the base material by using a cold spraying device to obtain a Cu-Cr-Nb sprayed layer. The process parameters of cold spraying are: the carrier gas is nitrogen, the carrier gas pressure is 5MPa, the preheating temperature is 450℃, the distance between the surface of the base material and the nozzle outlet of the spray gun is 40mm, and the spray gun moves up and down at a moving speed of 6mm / s.

[0033] S...

Embodiment 3

[0036] The Cu-Cr-Nb series alloy cold spray preparation method of this embodiment includes the following steps:

[0037] (1) Select the atomic percentage composition as Cu-6at.%Cr-3at.%Nb, the particle size is 40μm, Cr 2 The powder with Nb phase size of 4-8 μm was dried in a vacuum drying oven at 85 °C for 30 minutes to obtain the cold spray powder raw material; the electrolytic copper plate after cold rolling and sandblasting was used as the base material, and the base material was fixed at 100 rpm. on the axis of rotation.

[0038] Step 2, spraying the Cu-Cr-Nb powder onto the base material by using a cold spraying device to obtain a Cu-Cr-Nb sprayed layer. The process parameters of cold spraying are: the carrier gas is argon, the carrier gas pressure is 4MPa, the preheating temperature is 480℃, the distance between the surface of the base material and the nozzle outlet of the spray gun is 45mm, and the spray gun moves up and down at a moving speed of 4mm / s.

[0039] Step ...

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Abstract

The invention discloses a cold spraying forming method of a Cu-Cr-Nb series alloy. The cold spraying forming method comprises the following steps: drying a screened Cu-Cr-Nb powder material; cu-Cr-Nb powder is sprayed to a substrate material through cold spraying equipment, and a Cu-Cr-Nb spraying layer is obtained; performing vacuum annealing treatment to eliminate interface defects of the spraying layer; and the substrate material is removed through precision machining, and the Cu-Cr-Nb series alloy forming part is obtained. According to the method, rapid forming of the Cu-Cr-Nb alloy is achieved, the subsequent low-temperature vacuum annealing treatment is combined, structure optimization is conducted, and interface defects in a spraying coating are eliminated. Due to the fact that the low-temperature treatment process is adopted, the Cr2Nb phase is not coarsened, the mechanical property of the alloy is guaranteed, the hardness of the Cu-Cr-Nb alloy formed through cold spraying can reach 200-300 HV, and the size of the Cr2Nb phase is kept to be 2-8 micrometers.

Description

technical field [0001] The invention relates to the technical field of copper alloy preparation, in particular to a cold spray forming method of a Cu-Cr-Nb series alloy. Background technique [0002] Strengthening phase Cr in Cu-Cr-Nb alloys 2 The Nb phase is an intermetallic compound with high melting point (about 1730°C) and high temperature stability, which makes this type of alloy have excellent electrical conductivity, thermal expansion, creep resistance, high strength, high ductility and excellent resistance to low frequency fatigue properties. , is an ideal material for rocket engine combustion chamber lining. However, due to the slow cooling of the alloy during ordinary melt-casting preparation, Cr 2 The Nb phase is obviously coarsened, the size reaches 1 cm, and the strengthening effect is lost. Therefore, such alloys can only be prepared by aerosol method to prevent Cr 2 The Nb phase grows. In order to apply the Cu-Cr-Nb material to service scenarios, it is al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/00B22F3/24C23C24/04C22C9/00C22F1/08C22F1/02B22F5/00B22F5/10
CPCB22F3/00B22F3/24C23C24/04C22C9/00C22F1/08C22F1/02B22F5/006B22F5/10B22F2003/248B22F2003/247
Inventor 王云鹏娄花芬王同波莫永达王苗苗
Owner KUNMING METALLURGY INST
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