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Cuprum chromium-cuprum composite contact material and manufacturing method thereof

A composite contact, copper-chromium technology, applied in the direction of contacts, electrical components, electric switches, etc., can solve the problems of poor welding performance of copper-chromium contact materials, increase the manufacturing cost of vacuum switches, low electrical conductivity and thermal conductivity, etc. , to achieve the effect of reducing the difficulty of welding process, improving performance and reducing internal resistance

Active Publication Date: 2009-01-21
ZHEJIANG YATONG METAL CERAMICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper-chromium contact materials have poorer solderability and lower electrical and thermal conductivity than oxygen-free copper
The thickness of the copper-chromium contacts currently used is generally 3 to 6mm, and the wear amount of the single-piece contact of the vacuum switch in the actual use process is less than 1mm, that is, there is a 1.5mm thick copper-chromium layer in the vacuum switch. To meet the requirements of use, the excess copper-chromium part is not only a waste but also harmful to the performance of the switch. In addition, expensive 72AgCuPd solder and 72AgCu solder are required to be used when copper-chromium contacts are welded with oxygen-free copper. In order to ensure welding quality, generally use Secondary welding to check the welding condition of the copper-chromium contacts increases the manufacturing cost of the vacuum switch

Method used

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  • Cuprum chromium-cuprum composite contact material and manufacturing method thereof
  • Cuprum chromium-cuprum composite contact material and manufacturing method thereof

Examples

Experimental program
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preparation example Construction

[0017] 1. Preparation of copper-chromium layer powder: Copper powder is reduced in a hydrogen atmosphere at 300°C to 500°C for 1 to 4 hours, and chromium powder is reduced in a high-purity hydrogen atmosphere at 900°C to 1300°C for 1 to 4 hours. After the reduced raw materials are respectively crushed and screened, they are fully mixed in a vacuum mixer in proportion to obtain the powder for the copper-chromium layer. The ratio of copper to chromium is in the range of 80:20 to 40:60, and a small amount of other elements that can improve the performance of the contact can be added when mixing, such as W, WC, Te, Bi, Sb, Si, Ti, Fe, Mo, Ta and so on.

[0018] 2. Preparation of powder for copper layer: Copper powder is reduced in a hydrogen atmosphere at 300°C to 500°C for 1 to 4 hours, then pulverized and passed through a -200 mesh sieve. 0-10% ultrafine chromium powder, tantalum powder or molybdenum powder can be added to the reduced copper powder, and the particle size of the...

Embodiment 1

[0025] Example 1: Electrolytic copper powder of -200 mesh was reduced at 500°C for 2 hours in a hydrogen atmosphere, and homemade chromium powder of -120 mesh was reduced at 1300°C for 2.5 hours in a hydrogen atmosphere. Copper powder and chromium powder with a percentage by weight of 50:50 were mixed in a vacuum mixer for 1.5 hours to be used as powder for the copper-chromium layer. Add 2% fine chromium powder to the reduced copper powder and mix evenly as copper layer powder. The powder for the copper layer and the powder for the copper-chrome layer are respectively poured into the mould, scraped off, and formed under a pressure of 1000Mpa. The compact was vacuum sintered at 980°C for 2 hours. After sintering, it is repressed at 1100Mpa, and the recompacted blank is vacuum annealed at 800°C for 3 hours to obtain a copper-chromium 50-copper composite contact material.

Embodiment 2

[0026] Example 2: -200-mesh electrolytic copper powder was reduced at 400°C for 3 hours in a hydrogen atmosphere, and -120-mesh homemade chromium powder was reduced at 1200°C for 3 hours under a hydrogen atmosphere. Copper powder, chromium powder and tellurium powder with a weight percentage of 70:30:0.1 were mixed in a vacuum mixer for 2 hours to prepare the powder for the copper-chromium layer. Add 0.5% tantalum powder to the reduced copper powder and mix uniformly as powder for copper layer. The powder for the copper layer and the powder for the copper-chrome layer are respectively poured into the mould, scraped off, and formed under a pressure of 800Mpa. The compact was vacuum sintered at 900°C for 2 hours. After sintering, it is re-pressed at 1000Mpa, and the re-compacted blank is annealed with hydrogen at 900°C for 2 hours to obtain a copper-chromium 30 tellurium-copper composite contact material.

[0027] Properties of Composite Contact Materials

[0028]

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Abstract

The invention relates to a cu-cr-copper composite contact material and the method for making the material, the cu-cr-copper composite contact material mainly comprises a cu-cr layer, a layer of copper is compounded on at least one surface of the cu-cr layer, and the thickness of the cu-cr layer is 1.5-2.5mm, the thickness of the copper layer is 1.5-4.5mm, and the total thickness of the cu-cr layer and the copper layer can be arbitrarily controlled between 3.0-7.0mm according to the requirements. The making method comprises the following steps: firstly, preparing powder materials of the cu-cr layer, secondly, preparing powder materials for the copper layer, thirdly, pressing composite materials, fourthly, carrying out the sintering, the repressing and the after-burning. The manufacturing method has the following technical effects: firstly, the thickness of the cu-cr layer is greatly reduced, the inner electric resistance of the contact material is effectively reduced, and the performance of a vacuum switch tube is improved, secondly, the difficulty of the welding technique of the copper layer and a conducting bar is reduced, the welding is easy and the quality is reliable, thirdly, the dosage of chromium is reduced, thereby the cost of raw materials for manufacturing the contact materials is reduced, fourthly, common silver-copper solder can be directly used, one time sealing and exhausting can be realized and the manufacturing cost of the vacuum switch tube can be greatly reduced.

Description

technical field [0001] The invention relates to a composite electrical contact material and a manufacturing method thereof, which are applied in the electric vacuum switch industry and belong to the field of metal materials. Background technique [0002] At present, CuCr alloy materials are mainly used as contact materials in medium and high voltage vacuum switches at home and abroad. Because the CuCr contact material not only maintains the high electrical and thermal conductivity of copper, but also has the high melting point of chromium, so that the material has good arc corrosion resistance, high withstand voltage strength, large breaking current capacity, and also has relatively high Low cut-off value and good anti-welding performance. The excellent comprehensive performance of copper chromium contact material makes it quickly replace copper bismuth, copper tungsten and other materials as the preferred contact material for medium and high voltage vacuum switches since i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/021H01H11/00C22C1/04
Inventor 吴仲春丁枢华田军花
Owner ZHEJIANG YATONG METAL CERAMICS
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