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Method for preparing CuCr contact materials by means of vacuum self-consuming arc melting

A vacuum consumable arc and contact material technology, which is applied in the field of alloy material preparation, can solve the problems of high oxide content of materials, large pores in microstructure, etc., and achieve reduced gas content, uniform microscopic metallographic distribution, and cooling speed inhibitory effect

Inactive Publication Date: 2017-01-25
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 CuCr contact materials by means of vacuum self-consuming arc melting
  • Method for preparing CuCr contact materials by means of vacuum self-consuming arc melting

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Effect test

Embodiment 1

[0027] The method for preparing CuCr contact material by vacuum consumable arc melting comprises the following steps:

[0028] (1) Mix copper powder and Cr powder according to the ratio Cu(wt%):Cr(wt%)=70(wt)%:30(wt)% in the mixer for 2h-5h, and add them at the same time when mixing Mix half the weight of Cr powder and copper powder for 2 hours, then add the remaining Cr powder and copper powder at the same time, and mix for another 2 hours evenly;

[0029] (2) Under the pressure of 220Mpa in the cold isostatic press, press out the alloy bar stock of length L=800mm, outer diameter d=70, holding time 8min;

[0030] (3) followed by sintering at a temperature of 700° C. in a vacuum sintering furnace for 12 hours;

[0031] (4) Smelting the sintered bars in a vacuum consumable furnace. After closing the furnace door, the vacuum consumable furnace is evacuated, and then filled with an inert protective gas for smelting. The pressure of the inert gas is 150mbar, and the melting curre...

Embodiment 2

[0036] The method for preparing CuCr contact material by vacuum consumable arc melting comprises the following steps:

[0037] (1) Mix copper powder and Cr powder according to the ratio Cu(wt%):Cr(wt%)=65(wt)%:35(wt)% in the mixer for 2h-5h, add half of them respectively when mixing Weight of Cr powder and copper powder, mix for 2 hours, then add the remaining Cr powder and copper powder at the same time, and mix for another 2 hours evenly;

[0038] (2) Under the pressure of 220Mpa in the cold isostatic press, press out the alloy bar stock of length L=800mm, outer diameter d=70, hold pressure time 2min;

[0039] (3) followed by sintering at a temperature of 900° C. in a vacuum sintering furnace for 15 hours;

[0040] (4) Smelting the sintered bars in a vacuum consumable furnace. After closing the furnace door, the vacuum consumable furnace is evacuated, and then the furnace is filled with an inert protective gas for smelting. The protective gas pressure is 180mbar. The curre...

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Abstract

The invention relates to a method for preparing CuCr contact materials by means of vacuum self-consuming arc melting. The method includes selecting qualified Cu powder and Cr powder, proportionally mixing the Cu powder and the Cr powder with each other to obtain mixtures, compressing the mixtures by the aid of cold isostatic pressures to obtain bars, sintering the bars and carrying out self-consuming melting on the bars to obtain alloy cast ingots; quickly and uniformly melting self-consuming electrodes in a layered manner under the effect of high-temperature arc, dripping the self-consuming electrodes to the bottoms of water-cooled crystallizers, solidifying the CuCr (25%-40%) alloy cast ingots under the matching effects of the molten and dripped self-consuming electrodes and the high cooling speeds of the peripheries of the water-cooled crystallizers so as to obtain uniform and small CuCr alloy structures. The method has the advantages that the CuCr electric contact materials with the Cr content of 25%-40% can be prepared by the aid of vacuum self-consuming arc melting processes and are free of air holes, looseness, inclusion and macroscopic and microscopic defects such as Cu and Cr enrichment, and Cu and Cr microscopic structures are smaller than 30 mu m.

Description

technical field [0001] The invention relates to the technical field of alloy material preparation, in particular to a method for preparing CuCr contact material by vacuum consumable arc melting. Background technique [0002] The vacuum electric arc furnace is an electric furnace that directly heats and melts metals with an electric arc in a vacuumized furnace body. The gas in the furnace is thin, and the arc is mainly generated by the vapor of the molten metal. In order to stabilize the arc, direct current is generally supplied. According to the characteristics of smelting, it is divided into metal remelting furnace and casting furnace. According to whether the electrodes are consumed (melted) during the smelting process, they are divided into consumable furnaces and non-consumable furnaces. Most of the industrially used consumable furnaces are consumable furnaces. Vacuum arc furnaces are used to melt special steels, reactive and refractory metals such as titanium, molybde...

Claims

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Application Information

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IPC IPC(8): C22B9/20C22C9/00C22C1/02B22F3/10B22F3/04B22F9/04B22F9/24
CPCC22B9/20B22F3/04B22F3/10B22F9/04B22F9/24B22F2998/10C22C1/02C22C9/00B22F1/0003
Inventor 李鹏王小军徐润升师晓云贺德勇杨平刘凯赵俊
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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