Preparation method of composite contact

A composite contact and contact technology, which is applied in the direction of contacts, electrical components, electric switches, etc., can solve the problems of non-corrosion and anti-ablation performance, easy burning and loss of contacts, and decreased conductivity of contacts, etc., to achieve Meet the needs of industrialization, realize the effect of mass production and prolong the service life

Pending Publication Date: 2022-03-11
ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the moving and static contacts are pulled apart under load, due to the high voltage at both ends of the contacts, the medium between the two contacts is broken down to form an arc, which causes ablation of the surface of the sliding contact and the fixed contact. After that, the contacts are easy to burn and fail, and the deformation, corrosion and wear of the contacts during use are also important factors for contact ablation
In order to improve the anti-ablation performance and service life of the contacts, researchers have studied high-strength, anti-ablation and corrosion-resistant materials, by replacing the overall material of the contacts with high-strength, corrosion-resistant and anti-ablation contact materials, although It can reduce the ablation failure of the contact, but it will lead to a significant drop in the conductivity of the contact, which cannot be applied in high-voltage and ultra-high voltage lines
Pure copper is a widely used high-conductivity contact material base, but there are problems of low strength, poor corrosion resistance and poor ablation resistance

Method used

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  • Preparation method of composite contact

Examples

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preparation example Construction

[0022] In one or more embodiments of the present invention, a method for preparing a composite contact includes the following steps:

[0023] Using the powder metallurgy process, the contact material is pre-pressed to obtain a contact pre-pressed block, the contact pre-pressed block is placed in the contact assembly mold, and the base material is filled in the contact assembly mold, after pre-pressing The contact pre-compaction block is obtained, the contact pre-compaction block is pressed and sintered in powder metallurgy equipment, the contact material of the contact pre-compact block is sintered into a contact, the base material is sintered into a base material, and the The contact assembly of the contact and the base material is assembled to form a composite contact; the contact material includes copper-chromium alloy powder and strengthening particles, and the strengthening particles are Cr 2 Nb、Al 2 o 3 As a kind of WCu powder, copper-chromium-zirconium alloy powder is...

Embodiment 1

[0043] The structure of the composite contact made in this embodiment is as follows Figure 1~4 shown. Specific steps are as follows:

[0044] 1) Copper-chromium alloy powder with a particle size of 3 μm and 0.2 μm Cr 2 Nb powder mixed with Cr 2 The mass percent content of Nb powder is 3%. The mixed powder is placed in a ball mill for ball milling and mixing, and then pre-pressed at 500 MPa to obtain a contact pre-pressed block;

[0045] 2) Place the above-mentioned pre-pressed contact pre-pressed block in a contact assembly mold with a pressing function, fill it with copper-chromium-zirconium alloy powder and press it, and place the contact assembly mold in a powder metallurgy vacuum furnace. Sintering at 5MPa and 900°C for 30min, the contact material is sintered into contact 1, the base material is sintered into base material, the moving contact assembly 21 and the static contact assembly 31 are prepared, and assembled to form a composite contact . The contact 1 includ...

Embodiment 2

[0050] The preparation method of this embodiment and embodiment 1 is basically the same, the difference is: Cr 2 The mass percent content of Nb powder is 9%. Specific steps are as follows:

[0051] 1) Copper-chromium alloy powder with a particle size of 15 μm and 10 μm Cr 2 Nb powder mixed with Cr 2 The mass percent content of Nb powder is 9%. The mixed powder is placed in a ball mill for ball milling and mixed, and then pre-pressed at 350MPa to obtain a contact pre-pressed block;

[0052] 2) Place the above-mentioned pre-pressed contact pre-pressed block in a contact assembly mold with a pressing function, fill it with copper-chromium-zirconium alloy powder and press it, and place the contact assembly mold in a powder metallurgy vacuum furnace. Sintering at 3.5MPa and 900°C for 30min, the contact material is sintered into contact 1, the base material is sintered into base material, the moving contact assembly 21 and the static contact assembly 31 are prepared, and assembl...

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Abstract

The invention belongs to the technical field of contact preparation, and relates to a preparation method of a composite contact, which comprises the following steps: pre-pressing a contact material by using a powder metallurgy process to obtain a contact pre-pressing block, placing the contact pre-pressing block in a contact assembly mold, filling the contact assembly mold with a contact base material, pre-pressing to obtain a contact pre-pressing block, and carrying out hot pressing on the contact pre-pressing block to obtain the composite contact. Pressing and sintering the contact pre-pressing block in powder metallurgy equipment to prepare a contact assembly, and assembling the contact assembly to form a composite contact; the contact material comprises copper-chromium alloy powder and strengthening particles, and the strengthening particles are one of Cr2Nb powder, Al2O3 powder and WCu powder. The contact area of the moving contact and the static contact is replaced by the anti-ablation and anti-corrosion copper-chromium alloy dispersion reinforcing material, so that the anti-ablation and anti-corrosion performance of the area is improved by more than 50%.

Description

technical field [0001] The invention belongs to the technical field of contact preparation, and relates to a preparation method of a composite contact. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The high-voltage isolating switch plays an isolation role in the circuit and is used to open and close the circuit in the no-load state. The separated state can safely isolate the maintenance equipment and the switching device, and the closed state should be able to reliably pass the rated current, which is the most used type of high-voltage switchgear. Affected by the quality of the equipment and the operating environment, the contacts of the isolating switch frequently hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H11/04H01H1/021C22C9/00
CPCH01H11/048H01H1/021C22C9/00C22C32/00C22C32/0021
Inventor 党乐刘源钱文晓邵星海史昌明张俊双佟敏陈忠源杨倩倩曹磊
Owner ELECTRIC POWER RES INST OF EAST INNER MONGOLIA ELECTRIC POWER
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