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A preparation method for preparing copper-based electrical contact materials based on 3D printing technology

An electrical contact material, 3D printing technology, applied in metal material coating process, circuits, electrical switches, etc., can solve the problems of reducing the effective area of ​​conduction, low magnetic field strength, unable to realize the directional conduction and flow of conductive current of contacts, etc. Improve breaking current capability and withstand voltage breakdown capability, reduce the effect of ablation

Active Publication Date: 2020-06-09
XI AN JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, the CuCr alloy used in the vacuum contact material is produced by powder metallurgy process, and the arc ablation-resistant phase Cr in it is in a disordered state, and the directional conduction of the conductive current inside the contact cannot be realized. flow, limited control of the vacuum arc cathode spot by the magnetic field can only be achieved by external design
At the same time, the magnetic field intensity generated by the external structure is low, which reduces the effective area of ​​conduction under rated conditions, and the high temperature rise makes the rated current capacity of the vacuum circuit breaker unable to meet the needs of large-current and high-voltage power grids.

Method used

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  • A preparation method for preparing copper-based electrical contact materials based on 3D printing technology

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preparation example Construction

[0023] The technical solution of the present invention is a preparation method for preparing copper-based electrical contact materials based on 3D printing technology, the method comprising the following steps:

[0024] (1) Establish a three-dimensional skeleton model of Cr and 3D print it;

[0025] (2) inserting a core structure into the Cr three-dimensional skeleton obtained in step (1) and performing a sintering process; and,

[0026] (3) Infiltrating the highly conductive phase Cu into the skeleton obtained in step (2).

[0027] In the present invention, in step (1), a three-dimensional skeleton model of the arc ablation-resistant phase Cr is established in a computer, and the selective laser sintering technology is used for 3D printing.

[0028] In the present invention, in the step (2), the soft magnetic phase Fe, Co or Ni filaments are put into the three-dimensional Cr framework prepared in the step (1).

[0029] In the present invention, in the step (3), the highly c...

Embodiment 1

[0044] A method for preparing copper-based electrical contact materials based on 3D printing technology. The raw materials of the contact materials are chromium powder, copper powder and iron wire. The weight ratio of the three materials is 50:47:3, such as figure 2 The single unit of the prepared microstructure can generate a magnetic field up to 150mT when breaking a short-circuit current, which can meet the requirement of the magnetic field strength required for successful breaking of a large current. The specific steps of preparation are as follows:

[0045] (1) Pour the chrome powder with an average particle diameter of 20um into the powder cylinder of the 3D printer;

[0046] (2) Establish a three-dimensional skeleton model of the arc-ablation-resistant phase Cr in the computer, such as figure 1 The pore array of Fe filaments and the space of conductive phase Cu are reserved in the skeleton model shown;

[0047] (3) Selective laser sintering technology under argon atmos...

Embodiment 2

[0052] A preparation method for preparing copper-based electrical contact materials based on 3D printing technology. Tilting the microstructure unit by 15 degrees can obtain longitudinal magnetic field components and transverse magnetic field components on the contact surface. The raw materials of the contact materials are chromium powder, Copper powder and cobalt wire, the weight ratio of three kinds of materials is 50:45:5, and the concrete steps of preparation are as follows:

[0053] (1) Pour the chromium powder with an average particle diameter of 50um into the powder cylinder of the 3D printer;

[0054] (2) Establish a three-dimensional skeleton model of the arc-ablation-resistant phase Cr in the computer, the hole array of the cobalt wire reserved in the Cr skeleton model is inclined at 15 degrees, and the rest is the reserved space for the conductive phase Cu;

[0055] (3) Selective laser sintering technology under argon atmosphere for 3D printing of arc ablation resis...

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Abstract

The invention relates to a preparation method for preparing copper-based electrical contact materials based on 3D printing technology. The method comprises the following steps: (1) establishing a three-dimensional skeleton model of Cr, and 3D printing and forming; (2) the obtained in step (1) Inserting a soft magnetic phase core structure into the Cr three-dimensional framework; and (3) infiltrating the highly conductive phase Cu into the framework obtained in step (2). The copper-based electrical contact material of the present invention has an ordered magnetic field microstructure unit, which can generate a large magnetic field on the surface to drive arc spot movement, and improve the breaking current capability and voltage breakdown capability of the material.

Description

technical field [0001] The invention relates to the technical field of copper-based composite contact materials, in particular to a method for preparing copper-based electrical contact materials based on 3D printing technology. Background technique [0002] At present, CuCr alloy series vacuum contact materials are widely used in medium and high voltage vacuum switches at home and abroad, in which Cu is used as the conductive matrix and Cr is used as the skeleton material. In recent years, the preparation technology of CuCr alloy has also achieved great development and obtained better The comprehensive mechanical and electrical properties have been popularized in various types of vacuum circuit breakers for medium and low voltages, which has greatly promoted the rapid development of vacuum switches in my country. [0003] However, in the prior art, the CuCr alloy used in the vacuum contact material is produced by powder metallurgy process, and the arc ablation-resistant phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F3/10C23C10/22C22C27/06H01H11/04B33Y10/00
CPCH01H11/04C23C10/22B22F3/10B22F3/1007B33Y10/00B22F10/00B22F10/32B22F10/28B22F10/60Y02P10/25
Inventor 孔春才杨志懋杨森周超陈立王亚平张垠
Owner XI AN JIAOTONG UNIV
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