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Vacuum circuit-breaking switch contact material preparation method

A contact material, vacuum circuit breaker technology, applied in the direction of metal/alloy conductors, etc., can solve the problems of reducing the reliability of vacuum circuit breakers, the influence of contact material structure, and difficulty in achieving densification, etc., achieving fine particles, low production costs, The effect of increased cooling rate

Inactive Publication Date: 2010-07-28
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above shortcomings will affect the structure of the contact material and reduce the reliability of the vacuum circuit breaker.
[0004] Although many production methods have been developed, there are still some major problems in the production of copper-chromium alloy contacts: (1) the product is difficult to achieve densification (mainly for powder metallurgy and infiltration); (2) the gas content in the material is too high (3) The refinement of Cr particles in the alloy structure; (4) High-efficiency and high-quality new process technology route; (5) Large-size ingot preparation technology

Method used

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  • Vacuum circuit-breaking switch contact material preparation method
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  • Vacuum circuit-breaking switch contact material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] According to 25% chromium ingredients, in the vacuum induction furnace, control the vacuum degree in the induction furnace to be less than 1×10 -1 Pa, heated to 1850 ℃ for refining for 20 minutes, and the casting temperature was controlled at 1750 ℃ ​​to prepare CuCr25 contact material. The physical and mechanical properties of the material are shown in Table 1.

[0024] Table 1 Physical and mechanical properties of CuCr25 alloy materials

[0025]

[0026] For the convenience of comparison, Table 2 also lists the properties of domestic CuCr50 and CuCr25 produced by Westinghouse.

[0027] Table 2 Physical and mechanical properties of domestic and imported copper-chromium alloy materials

[0028]

[0029] It can be seen from the comparison between Table 1 and Table 2 that the electrical conductivity of the CuCr25 material prepared by the present invention is more than 30% higher than that of the ordinary CuCr25 material, and more than doubled that of the CuCr50 mat...

Embodiment 2

[0032] According to 20% chromium ingredients, in the vacuum induction furnace, control the vacuum degree in the induction furnace to be less than 1×10 -1 Pa, heated to 1800°C for refining for 20 minutes, and the casting temperature was controlled at 1700°C to prepare a CuCr20 contact material. The physical and mechanical properties of the material are shown in Table 3.

[0033] Table 3 Physical and mechanical properties of CuCr20 alloy materials

[0034]

Embodiment 3

[0036] According to 30% chromium ingredients, in the vacuum induction furnace, control the vacuum degree in the induction furnace to be less than 1×10 -1 Pa, heated to 1900°C for refining for 20 minutes, and the casting temperature was controlled at 1750°C to prepare a CuCr30 contact material. The physical and mechanical properties of the material are shown in Table 4.

[0037] Table 4 Physical and mechanical properties of CuCr30 alloy materials

[0038]

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Abstract

The invention discloses a vacuum circuit-breaking switch contact material preparation method and water-cooled mould equipment used by the method. The preparation method includes that copper and chromium are melt in a vacuum induction furnace to form alloy liquid, and then the melt alloy is cast into casting blanks. The concrete process parameters include: the vacuum degree is less than 1*10<-1>Pa, the heating temperature range is 1600-1950 DEG C according to the proportion of chromium content, when chromium is melted completely, the stirring refinement process lasts for 20 min, and then the alloy melt is injected into a water-cooled mould equipment with cooling water on periphery, and the casting temperature is maintained at 1600-1800 DEG C. The contact material prepared by the method has compact structure and fine crystalline grains, improves the electrical conductivity, reduces gas content, realizes large-size ingot blank and has high qualified rate; besides, the production equipment is general, the production cost is low and the mass production can be realized more easily.

Description

technical field [0001] The invention relates to a preparation method of a high-performance large-size copper-chromium alloy contact material, in particular to a preparation method of a high-power vacuum circuit breaker contact material. Background technique [0002] Contact is the core component of vacuum fuse. Copper-chromium alloy is the most commonly used contact material in vacuum fuse manufacturing. At present, there are three main preparation methods of CuCr alloy in the world: (1) Powder metallurgy Cr powder and a certain proportion of Cu powder are uniformly mixed, and formed by cold pressing and hot pressing to form a block contact material; (2) infiltration method, a suitable amount of Cu powder and all Cr powder is made into a prefabricated skeleton, Then use gravity to infiltrate Cu into the framework under vacuum; (3) Consumable electrode method, press a certain proportion of Cu powder and Cr powder into a consumable electrode rod blank, and then prepare a conta...

Claims

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Application Information

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IPC IPC(8): C22C1/02B22D27/04H01B1/02
Inventor 刘新宽刘平
Owner UNIV OF SHANGHAI FOR SCI & TECH
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