Copper-chromium contact material for vacuum circuit breaker and preparation method thereof

A vacuum circuit breaker, copper-chromium contact technology, applied in circuits, electrical components, electrical switches, etc., can solve the problems of reduced service life and effect, uneven contact material organization, intolerant of arc erosion, etc., to improve the use of The effect is that the contact structure is dense and the arc erosion resistance is good.

Inactive Publication Date: 2019-02-19
HENAN CHANGZHENG ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a copper-chromium contact material for vacuum circuit breakers and its preparation method, which has the advantages of good use effect and solves the problems of uneven structure, poor density and uneven contact material produced by traditional techniques. Resistant to arc erosion, which reduces the problem of its service life and effectiveness

Method used

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Examples

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Effect test

preparation example Construction

[0026] The preparation method comprises the following steps:

[0027] (1) Raw material screening

[0028] Choose 30-350μm chromium powder and 350μm copper powder, the chromium powder is electrolytic chromium powder or thermite reduction chromium powder, and the copper powder is electrolytic copper powder or atomized copper powder;

[0029] (2) mixed powder

[0030] According to the weight ratio of chromium powder: copper powder=2: 8~6: 4, and by the weight ratio of the mixed powder of chromium powder and copper powder: copper ball=1: 1, carry out ball milling and mix powder 2~12 hours;

[0031] (3) cold isostatic pressing

[0032] Put the mixed powder into the rubber sleeve and cold isostatically press it into a bar, the pressure is 120-350MPa, and the holding time is 2-25 minutes;

[0033] (4) Vacuum bag

[0034] Put the bar material pressed in step (3) into the copper sleeve, the thickness of the copper sleeve is 1-6mm, vacuumize to 1Pa-0.01Pa for vacuum sealing;

[003...

Embodiment 1

[0039] First select chromium powder of 30-350 μm and copper powder below 350 μm, chromium powder is electrolytic chromium powder or aluminothermic reduction chromium powder, copper powder is electrolytic copper powder or atomized copper powder; then press chromium powder: copper powder = 2: 8~6:4 weight ratio, and according to the weight ratio of mixed powder of chromium powder and copper powder: copper ball=1:1, carry out ball milling and mixing powder for 2~12 hours; then put the mixed powder into The rubber sleeve is cold isostatically pressed into a bar, the pressure is 120-350MPa, and the holding time is 2-25 minutes; then the bar pressed in step (3) is put into the copper sleeve, and the thickness of the copper sleeve is 1-6mm. Vacuumize to 1Pa ~ 0.01Pa for vacuum sealing; then heat the sealed bar to 40 ~ 550°C and keep it warm for 20 minutes to 150 minutes; use a hydraulic press for cold extrusion or warm extrusion, and the amount of extrusion deformation The tonnage of...

Embodiment 2

[0041] In embodiment one, add following operation:

[0042] Set the ball milling time in step (2) to 2-12 hours, and set the rotation speed to 200-300 rpm.

[0043] First select chromium powder of 30-350 μm and copper powder below 350 μm, chromium powder is electrolytic chromium powder or aluminothermic reduction chromium powder, copper powder is electrolytic copper powder or atomized copper powder; then press chromium powder: copper powder = 2: 8~6:4 weight ratio, and according to the weight ratio of mixed powder of chromium powder and copper powder: copper ball=1:1, carry out ball milling and mixing powder for 2~12 hours; then put the mixed powder into The rubber sleeve is cold isostatically pressed into a bar, the pressure is 120-350MPa, and the holding time is 2-25 minutes; then the bar pressed in step (3) is put into the copper sleeve, and the thickness of the copper sleeve is 1-6mm. Vacuumize to 1Pa ~ 0.01Pa for vacuum sealing; then heat the sealed bar to 40 ~ 550°C and...

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Abstract

The invention discloses a copper-chromium contact material for a vacuum circuit breaker and a preparation method thereof. The copper-chromium contact material comprises the following components of, byweight, 20-60% of Cr and the balance Cu, and comprises the following raw materials of, by weight, 30-350 microns of chromium powder and 350 or below microns of copper powder, wherein the chromium powder is electrolytic chromium powder or aluminothermic reduction chromium powder, the copper powder is electrolytic copper powder or atomized copper powder, the purity of the chromium powder is 99.00%-99.98%, and the purity of the copper powder is 99.00%-99.98%. Compared with an existing mold pressing and sintering process, the preparation method of the copper-chromium contact material for the vacuum circuit breaker, mass stabilization production can be achieved, and large-specification copper-chromium contacts can be produced in a batched mode. According to the preparation method, the technological process is simple, the heating process is only 30-90 minutes, and time and energy are greatly saved compared with a mold pressing sintering process which is as long as 15-30 hours. The producedcontacts are compact in structure, free of air holes and other defects and good in electric arc erosion resistance.

Description

technical field [0001] The invention relates to the technical field of copper-chromium contacts, in particular to a copper-chromium contact material for vacuum circuit breakers and a preparation method thereof. Background technique [0002] Contact materials are widely used in automatic switches, large-capacity circuit breakers, molded case circuit breakers and other switches. Common contact materials are Ag-WC-C, which mainly utilizes the good electrical and thermal conductivity of Ag. WC has the characteristics of high melting point, high hardness and good wear resistance. It can withstand strong arc corrosion and has good welding resistance and corrosion resistance. The contact material is generally made of powder metallurgy. Silver powder and WC powder and additives are directly pressed in the mold. This process is simple and easy, with less processes, low equipment requirements, high material yield and low production cost, but the obtained electrical contact materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C27/06C22C1/04H01H11/04
CPCC22C9/00C22C1/0425C22C1/045C22C27/06H01H11/048
Inventor 潘龙飞李永静
Owner HENAN CHANGZHENG ELECTRIC
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