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Cu-Ni functionally gradient material and preparation method thereof

A gradient material, cu-ni technology, used in chemical instruments and methods, layered products, metal layered products, etc., can solve the problem of inability to prepare high-temperature oxidation resistance, electrical conductivity, thermal conductivity and mechanical properties of materials, loss of electrical conductivity of materials and mechanical toughness, the inability to prepare alloy surfaces, etc., to achieve the effects of good electrical conductivity, strong surface oxidation resistance, and tight bonding

Inactive Publication Date: 2012-09-19
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still cannot prepare materials with gradient changes in Cu and Ni content.
[0007] The above analysis shows that there is no Cu-Ni gradient material and its preparation method at present. Even in the preparation of Cu-Ni alloy materials similar to this material, there are the following deficiencies: (1) During the preparation process, the surface of the alloy cannot be prepared. Gradient materials with high nickel content; (2) If the Ni composition in the Cu-Ni alloy is increased too high, the material will lose its good electrical conductivity and mechanical toughness; (3) It cannot be prepared with good high temperature oxidation resistance Materials with good electrical and thermal conductivity and mechanical properties

Method used

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  • Cu-Ni functionally gradient material and preparation method thereof
  • Cu-Ni functionally gradient material and preparation method thereof
  • Cu-Ni functionally gradient material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: This Cu-Ni gradient material is prepared by the following process.

[0025]Prepare molten salt according to the proportion of 0.2mol NaCl, 0.2mol KCl, 0.6mol KF, and NiO as 1.5 times the saturation amount, put the above molten salt system into a graphite crucible, put it into an electric furnace and raise the temperature to 650°C, and keep it at a constant temperature for 60 minutes. NiO dissolves in the molten salt to reach saturation; put the cathode copper plate into the molten NaCl-KCl-KF-NiO molten salt, apply a DC pulse current with a current density of 150 cm -2 At the same time, after 10 minutes of electrodeposition, take out the cathode material from the molten NaCl-KCl-KF-NiO molten salt system, put it into boiling water and cook for about 30 minutes, so that there is no obvious molten salt attachment on the copper plate substrate, and then use deionized water, Rinse the sample with alcohol. The analysis results of the coating surface morpholo...

Embodiment 2

[0026] Embodiment 2: This Cu-Ni gradient material is prepared by the following process.

[0027] Prepare molten salt according to the molar fraction of 0.3mol NaCl, 0.3mol KCl, 0.4mol KF, and NiO as twice the saturation amount, put the above molten salt system into a graphite crucible, put it into an electric furnace and raise the temperature to 700°C, and keep the temperature for 120min. NiO dissolves in the molten salt to reach saturation; put the cathode copper plate into the molten NaCl-KCl-KF-NiO molten salt, apply a DC pulse current with a current density of 200 cm -2 At the same time, after 20 minutes of electrodeposition, take out the cathode material from the molten NaCl-KCl-KF-NiO molten salt system, put it in boiling water and cook for about 10 minutes, so that there is no obvious molten salt attachment on the copper plate substrate, and then use deionized water, Rinse the sample with alcohol. The analysis results of the coating surface morphology, section thickn...

Embodiment 3

[0028] Embodiment 3: This Cu-Ni gradient material is prepared by the following process.

[0029] Prepare molten salt according to the ratio of 0.4mol NaCl, 0.4mol KCl, 0.2mol KF, and NiO to 3 times the saturation amount, put the above molten salt system into a graphite crucible, put it into an electric furnace and raise the temperature to 750°C, and keep the temperature for 90 minutes. NiO dissolves in the molten salt to reach saturation; put the cathode copper plate into the molten NaCl-KCl-KF-NiO molten salt, apply a DC pulse current with a current density of 250 cm -2 At the same time, after 30 minutes of electrodeposition, take out the cathode material from the molten NaCl-KCl-KF-NiO molten salt system, put it into boiling water and cook for about 20 minutes, so that there is no obvious molten salt attachment on the copper plate substrate, and then use deionized water, Rinse the sample with alcohol. The analysis results of the coating surface morphology, section thickne...

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Abstract

The invention discloses a Cu-Ni functionally gradient material and a preparation method thereof. The functionally gradient material comprises an intermediate copper layer and two side nickel layers, wherein a gradient distribution layer is arranged between the copper layer and each nickel layer; and the copper content of the gradient distribution layer is decreased gradually and the nickel content is increased gradually to the directions of the nickel layers. The material is high in bending resistance, electric conductivity, heat conductivity and mechanical performance; various parts of the material are linked closely; the surface structure of the material is dense and flat; a stable NiO protective film can be formed on the surface of the material in the air at the temperature of 700 to 900 DEG C, so that substrate copper is effectively prevented from being oxidized; and therefore, the material has the characteristic of high surface oxidation resistance. According to the preparation method, aiming at the characteristics of the conventional Cu-Ni functionally gradient material, according to a diffusion basic theory, the method of electrodepositing Ni and interfusing Ni and Cu at the same time under the action of an electric field is adopted to accelerate the thickening of a gradient layer. The preparation method has the advantages that the formation speed of the gradient layer is high; the time required for preparing a thick gradient layer is short; and the method is easy to control and simple in process and the like.

Description

technical field [0001] The invention relates to a gradient material, in particular to a Cu-Ni gradient material and a preparation method thereof. Background technique [0002] As a new type of material, gradient materials have been applied in nuclear energy, biomedicine, machinery, petrochemical, information, civil and aerospace fields. The key feature of the gradient material is to control the continuous change of the composition and structure of the interface, so that two or more materials with different properties can be well connected, thereby improving the performance and life of the material. Cu-Ni gradient materials have good seawater corrosion resistance and high temperature and oxidation resistance, and have broad application prospects in the fields of marine engineering and aerospace. [0003] There are no reports on the preparation of Cu-Ni gradient materials at home and abroad, but there are few reports on the preparation of Cu-Ni alloy materials in China. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01C25D5/18C25D5/14
Inventor 李运刚李杰柳亚斌杨海丽田薇王艳春
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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