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Preparation method of copper-chromium composite coating

A composite coating and copper-chromium technology, which is applied in the field of preparation of copper-chromium composite coatings, can solve the problems of thin copper-chromium alloy coating, and achieve the effects of small spray loss, tight bonding and excellent mechanical properties

Pending Publication Date: 2021-01-08
XI'AN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a copper-chromium composite coating, which solves the problem that the thickness of the copper-chromium alloy coating in the prior art is relatively thin

Method used

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preparation example Construction

[0019] A preparation method of copper-chromium composite coating, such as figure 1 shown, including the following steps:

[0020] Step 1. The copper powder with a purity of 99.8% and a particle size of 40-50 μm and the chromium powder with a particle size of 30-45 μm are mixed according to a mass ratio of 1:0.8-1 for 1-1.5 hours by high-energy ball milling, and then dried in a vacuum Dry in the oven at a temperature of 80-90°C for 20-30 minutes to obtain raw materials for cold spraying;

[0021] Step 2. Use multi-purpose 110 copper (electrolytic hard pitch (ETP) copper) with a purity of 99.9% as the base material, and polish the copper substrate in advance; use cold spray equipment to spray the cold spray raw materials on the copper substrate, cold spray The process parameters of the equipment are: the distance of cold spraying is 8-12mm, the rate of powder feeding is 0.9-1.2rpm, the pressure of cold spraying is 2.1-2.3MPa, the spraying temperature is 400-500°C, and the gas i...

Embodiment 1

[0027] Step 1. Mix copper powder with a purity of 99.8%, a particle size of 40 μm, and a chromium powder with a particle size of 30 μm at a mass ratio of 1:0.8 for 1 hour by high-energy ball milling, and then dry in a vacuum oven at 80°C for 20 minutes , to obtain the raw material for cold spraying;

[0028] Step 2, using multi-purpose 110 copper (electrolytic hard pitch (ETP) copper) with a purity of 99.9% as the substrate, the size of the copper substrate is 57.2mm*50.9mm*3.2mm, and the copper substrate is polished in advance; The spraying equipment sprays the cold spraying raw materials on the copper substrate. The process parameters of the cold spraying equipment are: the cold spraying distance is 8mm, the powder feeding rate is 0.9rpm, the cold spraying pressure is 2.1MPa, the spraying temperature is 400°C, and the gas is N 2 ; Obtain a Cu-Cr composite coating with a thickness of about 3.0mm on the copper substrate;

[0029] Step 3, annealing the Cu-Cr composite coating ...

Embodiment 2

[0031] Step 1. Mix copper powder with a purity of 99.8% and a particle size of 45 μm and chromium powder with a particle size of 40 μm for 1.2 hours by high-energy ball milling at a mass ratio of 1:0.9, and then dry it in a vacuum oven at a temperature of 85°C 25min, get cold spraying raw material;

[0032] Step 2, using multi-purpose 110 copper (electrolytic hard pitch (ETP) copper) with a purity of 99.9% as the substrate, the size of the copper substrate is 57.2mm*50.9mm*3.2mm, and the copper substrate is polished in advance; The spraying equipment sprays the cold spraying raw materials on the copper substrate. The process parameters of the cold spraying equipment are: the cold spraying distance is 10mm, the powder feeding rate is 1rpm, the cold spraying pressure is 2.2MPa, the spraying temperature is 450°C, and the gas is N 2 ; Obtain a Cu-Cr composite coating with a thickness of about 3.0mm on the copper substrate;

[0033] Step 3, annealing the Cu-Cr composite coating at...

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Abstract

The invention discloses a preparation method of a copper-chromium composite coating. The preparation method comprises the following steps of: mixing copper powder and chromium powder, and drying to obtain a cold spraying raw material; spraying the cold spraying raw material on a copper substrate by using cold spraying equipment to obtain a sample with a Cu-Cr composite coating; and annealing the Cu-Cr composite coating, and then performing post-treatment on the sample to obtain a Cu-Cr composite coating sample. The copper-chromium composite coating with the thickness of about 3.0mm can be obtained, and the copper-chromium composite coating is high in deposition efficiency, excellent in mechanical property and relatively good in wear resistance, and the hardness of the copper-chromium composite coating exceeds 125HV.

Description

technical field [0001] The invention belongs to the technical field of copper alloy preparation methods, and relates to a preparation method of a copper-chromium composite coating. Background technique [0002] Copper-chromium alloy is a kind of functional and structural integrated material with excellent comprehensive mechanical properties and physical properties. It not only has high strength and high plasticity, but also has excellent thermal conductivity, electrical conductivity and corrosion resistance. It is the first choice for high conductivity and high strength in the preparation of resistance welding motors, metal molds, spot welding machine terminals, integrated circuit lead frames, and vacuum switch contacts. Material. [0003] So far, the preparation methods of copper-chromium alloy mainly include powder sintering method, vacuum arc melting method, mechanical alloying method, plasma spraying method and so on. Among them, the copper-chromium composite coating i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C21D1/26
CPCC23C24/04C21D1/26
Inventor 常延丽王金龙梁苗苗付翀王亚平张宏伟刘德华
Owner XI'AN POLYTECHNIC UNIVERSITY
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