Method for preparing copper and chromium 50 electric contact material by utilizing vacuum arc remelting furnace

A vacuum consumable arc and electrical contact material technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high oxide content, microstructure and large pores, and achieve high purity and refined microstructure. , The effect of reducing the content of material gas and other impurities

Active Publication Date: 2018-08-24
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for preparing CuCr contact materials include: vacuum melting and casting method, mixed powder sintering method, plasma spraying method, but the materials prepared by these methods have defects such as high oxide content, large pores in the microstructure, etc.

Method used

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  • Method for preparing copper and chromium 50 electric contact material by utilizing vacuum arc remelting furnace
  • Method for preparing copper and chromium 50 electric contact material by utilizing vacuum arc remelting furnace

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Embodiment 1

[0027] The method for preparing copper chromium 50 electrical contact material by utilizing vacuum consumable electric arc furnace comprises the following steps:

[0028] (1) Mix Cu powder and Cr powder in a mixer according to the ratio Cu(wt%):Cr(wt%)=45:55. When mixing, first add one-third of the weight of Cr powder and copper powder at the same time , mixed for 1 hour, then continued to add one-third of the weight of Cr powder and copper powder, mixed for 1 hour, and finally added the remaining Cr powder and copper powder, and mixed for another 1 hour until uniformly mixed; during the entire mixing process, the temperature of the material was kept at 80 °C; maintaining a temperature of 80 °C is conducive to volatilizing the moisture and other stains adsorbed on the surface of Cr powder and copper powder, further ensuring the purity and cleanliness of the material, and then ensuring the performance of the final material prepared;

[0029] (2) under the pressure of 220Mpa in ...

Embodiment 2

[0036] The method for preparing copper chromium 50 electrical contact material by utilizing vacuum consumable electric arc furnace comprises the following steps:

[0037] (1) Mix copper powder and Cr powder in a mixer according to the ratio of Cu(wt%):Cr(wt%)=50:50. When mixing, first add one-third of the weight of Cr powder and copper powder at the same time , mix for 1h-3h, then continue to add one-third of the weight of Cr powder and copper powder, mix for 1h-3h, finally add the remaining Cr powder and copper powder, and mix for another 3h to mix evenly; keep the material during the whole mixing process The temperature is 100°C; maintaining a temperature of 100°C is conducive to volatilizing the moisture and other stains adsorbed on the surface of Cr powder and copper powder, further ensuring the purity and cleanliness of the material, and thus ensuring the performance of the final material prepared; The particle size of copper powder is 1 micron, and the particle size of C...

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Abstract

The invention relates to a method for preparing a copper and chromium 50 electric contact material by utilizing a vacuum arc remelting furnace. Copper powder with particle diameter ranging from 0.01 micron to 1 micro, and chromium powder with particle diameter ranging from 0.01 micron to 1 micro are prepared with a new method, and are smaller in particle diameter compared with the copper powder and the chromium powder used in the prior art. The prepared copper powder and chromium powder are chosen to be mixed according to certain proportion, the mixer is pressed into material bars by using cold isostatic pressing, and the material bars carry out consumable electrode arc melting after being sintered to form alloy ingots. Under the action of a high-temperature electric arc, a consumable electrode carries out layered melting quickly and evenly and drops to the bottom of a water cooling crystallizer, and because of the large cooling rate on the periphery of the crystallizer furthermore, itis realized that Cu and Cr alloy ingots solidify, and then uniform and fine Cu and Cr alloy structures are obtained, wherein the content of Cr in Cu and Cr alloy ranges from 45% to 55%. According tothe method for preparing the copper chromium 50 electric contact material by utilizing the vacuum arc remelting furnace, a vacuum consumable electrode arc melting method is used for preparing a Cu andCr electric contact material with the content of Cr ranging from 45% to 55% (wt), the material is free of pores, loose, less in impurities, free of macro and micro defects such as Cu and Cr enrichment, and both the microstructure of Cu and the microstructure of Cr are smaller than 20 micrometers.

Description

technical field [0001] The invention relates to the technical field of alloy material preparation, in particular to a method for preparing copper-chromium 50 electrical contact materials by using a vacuum consumable electric arc furnace. Background technique [0002] Copper-chromium (CuCr) alloy is widely used as a contact material in medium and high voltage vacuum circuit breakers because of its good withstand voltage strength and good breaking current capability. Gas, impurity content and microstructure morphology are the key to determine its performance. When the material contains higher oxygen or more inclusions, it will greatly damage the performance of the contact, and even cannot be used. The inhomogeneity of the alloy microstructure will produce segregation and reduce the performance of the alloy. The finer the Cr phase in the alloy, the higher the withstand voltage strength. Therefore, the key to the development of high-performance CuCr contact materials is to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C27/06C22C1/02C22B9/20B22F9/04B22F9/24B22F1/00
CPCC22B9/20C22C1/02C22C9/00C22C27/06B22F9/04B22F9/24B22F2009/042B22F1/052
Inventor 王海龙梁计鱼王文斌徐润生王小军
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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