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Method for preparing CuCr25 electrical contact

A technology of electric contacts and electric contact materials, applied in the direction of circuits, electric switches, electrical components, etc., can solve the problems of difficult to ensure densification, large pores, high oxide content, etc., to reduce inclusions and gas content, cooling Effect of speed suppression and reduction of gas content

Inactive Publication Date: 2015-09-09
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is simple in process and low in cost, but it is difficult to meet the requirements of densification, and the material prepared by this method has defects such as high oxide content, large pores in the microstructure, etc.

Method used

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  • Method for preparing CuCr25 electrical contact
  • Method for preparing CuCr25 electrical contact

Examples

Experimental program
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Effect test

Embodiment 1

[0033] According to the ratio Cu(wt%): Cr(wt%)=75(wt)%: 25(wt)% mixed in the mixer for 4h, pressed under the pressure of 180Mpa in the cold isostatic press to length L=800mm , the alloy bar with outer diameter d=70 was then sintered in a vacuum sintering furnace at a temperature of 900°C for 90 minutes, and then the sintered bar was smelted in a vacuum consumable furnace. In order to obtain a fine microstructure, the size of the melting current For 1000A, the molten alloy melt is dropped into the water-cooled crystallizer to achieve rapid cooling, and then the crystallized ingot gradually rises, and the consumable electrode is gradually shortened from top to bottom.

Embodiment 2

[0035] 1) Select qualified Cu powder and Cr powder according to the composition ratio of CuCr25 electrical contact material for mixing

[0036] Use copper block and chromium block to prepare qualified Cu powder and Cr powder respectively, the purity of Cu powder used is not less than 99.3%, and the purity of Cr powder is not less than 99.8%; select Cu powder and Cr powder according to the composition ratio of CuCr25 electrical contact material , the weight ratio is 74~77: 23~26, then the two are uniformly mixed in a mixer for 3~5h;

[0037] 2) Cold isostatic pressing of the uniformly mixed powder

[0038] Put the material components mixed in step 1) into a cold isostatic press, and press under a pressure of 150-200Mpa to obtain an alloy bar. The size of the pressed alloy bar is length L=800mm, outer diameter d =70mm; the cylinder body of the cold isostatic press is a crucible-shaped cylinder with an upper opening, and a reinforced steel hoop is installed on the outside to for...

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Abstract

The invention discloses a method for preparing CuCr25 electrical contact by utilizing the vacuum self-consuming arc-melting technology. The method comprises the steps that 1, qualified Cu powder and Cr powder are selected according to composition proportion of CuCr25 electrical contact materials and mixed; 2, cold isostatic pressing is conducted on the evenly mixed powder; 3, sintering is conducted on a self-consuming electrode which is subject to cold isostatic pressing; 4, self-consuming smelting is conducted on the electrode which is subject to sintering. By means of the method for preparing the CuCr25 electrical contact by utilizing the vacuum self-consuming arc-melting technology, the inclusion problem caused by scaling-off of a crucible in the preparation process of the electrical contact materials through the smelting and casting technology is solved, microstructures of the CuCr25 electrical contact materials in the casting state are refined, the gas content in a casting ingot is reduced, and the alloy casting ingot is purified.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for preparing CuCr25 electric contacts by using a vacuum consumable arc melting process. Background technique [0002] Because the vacuum circuit breaker contacts have higher requirements on the gas content and microstructure of copper-chromium materials. Chromium is an oxophilic element. In theory, methods such as vacuum arc self-consumption smelting, vacuum induction smelting, electron beam smelting, and electron bombardment smelting of special metallurgy can be used. In actual operation, due to the high vapor pressure of copper and chromium, it is difficult to solve the problem of high vacuum and electron gun pollution. Electron beam smelting is not suitable for large-scale production. Technically speaking, although the vacuum melting casting method has solved some problems, compared with the advantages of vacuum arc melting copper chromium contact mate...

Claims

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Application Information

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IPC IPC(8): B22F3/16H01H11/04
Inventor 周宁赵伟鹏王桢陈梅郭创立杨平王万刚李刚王文斌
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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