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Method for preparing CuWCr composite material in consumable electrode arc-melting furnace

An electric arc melting furnace and composite material technology, which is applied in the field of CuWCr composite material prepared by consumable electrode arc melting furnace, can solve the problems of unrefined Cr particles, low withstand voltage strength, high gas content, etc., and achieve high density, The effect of high withstand voltage strength and low gas content

Inactive Publication Date: 2012-02-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing CuWCr composite material in a consumable electrode arc melting furnace, which solves the problem that the Cr particles in the structure of the CuWCr composite material prepared by the existing method are not refined, the withstand voltage strength is low, and the gas content is high. , impurities, etc.

Method used

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  • Method for preparing CuWCr composite material in consumable electrode arc-melting furnace

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, 20% of Cu powder, 12% of W powder, and 68% of Cr powder were mixed in a mixer for 3 hours according to mass percentage, and the mixed powder was molded at 400 MPa.

[0024] Then, the compacted blank is placed in a vacuum sintering furnace, and when the vacuum degree is greater than 10 -2 The temperature was raised to 950° C. under a vacuum environment of Pa, and sintered for 150 minutes to obtain a CuWCr sintered compact.

[0025] Finally, the CuWCr sintered compact is placed in a vacuum consumable electrode arc melting furnace, and the vacuum degree is not less than 10 -3 Under the vacuum environment of Pa, adjust the smelting current to be greater than 1500A for smelting, so that the CuWCr blank is melted and dropped into the water-cooled copper crucible under the high temperature of the arc, and taken out after cooling to obtain the CuWCr composite material.

Embodiment 2

[0027] First, 30% of Cu powder, 8% of W powder, and 62% of Cr powder were mixed in a mixer for 5 hours according to the mass percentage, and the mixed powder was subjected to cold isostatic pressing at 260 MPa.

[0028] Then, the compacted blank is placed in a vacuum sintering furnace, and when the vacuum degree is greater than 10 -2 The temperature was raised to 1050° C. under a vacuum environment of Pa, and sintered for 60 minutes to obtain a CuWCr sintered compact.

[0029] Finally, the CuWCr sintered compact is placed in a vacuum consumable electrode arc melting furnace, and the vacuum degree is not less than 10 -3 Under the vacuum environment of Pa, adjust the smelting current to be greater than 1500A for smelting, so that the CuWCr blank is melted and dropped into the water-cooled copper crucible under the high temperature of the arc, and taken out after cooling to obtain the CuWCr composite material.

Embodiment 3

[0031] Firstly, 35% of Cu powder, 5% of W powder and 60% of Cr powder were mixed in a mixer for 6 hours according to mass percentage, and then the mixed powder was molded at 400MPa.

[0032] Then, the compacted blank is placed in a vacuum sintering furnace, and when the vacuum degree is greater than 10 -2 The temperature was raised to 1000° C. under a vacuum environment of Pa, and sintered for 100 minutes to obtain a CuWCr sintered compact.

[0033] Finally, the CuWCr sintered compact is placed in a vacuum consumable electrode arc melting furnace, and the vacuum degree is not less than 10 -3 Under the vacuum environment of Pa, adjust the smelting current to be greater than 1500A for smelting, so that the CuWCr blank is melted and dropped into the water-cooled copper crucible under the high temperature of the arc, and taken out after cooling to obtain the CuWCr composite material.

[0034] The performance comparison between the CuWCr composite material prepared by the method o...

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Abstract

The invention discloses a method for preparing a CuWCr composite material in a consumable electrode arc-melting furnace, which comprises the following steps: mixing Cu powder, W powder and Cr powder in mass percents in a mixer, and carrying out die pressing or cold isostatic pressing on the mixed powder; putting the pressed blank in a vacuum sintering furnace, and heating to 950-1050 DEG C to sinter the pressed blank in a vacuum environment of which the vacuum degree is higher than 10<-2>Pa, thereby obtaining a CuWCr sintered blank; and finally, putting the CuWCr sintered blank in a vacuum consumable electrode arc-melting furnace, melting in a vacuum environment until the CuWCr blank is melted to drop in a water-cooled copper crucible, and taking out the CuWCr composite material after cooling. The invention combines melting and directional solidification to prepare the CuWCr composite material which has uniform and fine structure, high voltage strength resistance, high density, low gas content, fewer impurities and other comprehensive properties.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for preparing CuWCr composite materials in a consumable electrode arc melting furnace. Background technique [0002] At present, the methods for preparing CuWCr composite materials are mainly sintering infiltration method and mechanical alloying method. The Cr particles in the CuWCr composite material prepared by the sintering infiltration method have not been refined, and the large chromium particles generate more heat, poor thermal conductivity, and high local temperature, which leads to breakdown and reduces the withstand voltage strength of the material. In the process of preparing CuWCr composite materials by mechanical alloying, impurities are easily introduced, and the material has a high gas content, which affects the electrical conductivity and breaking performance of the material. Contents of the invention [0003] The purpose of the present inv...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C27/06B22D27/04
Inventor 肖鹏张亚梅梁淑华
Owner XIAN UNIV OF TECH
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