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Method for adopting spark plasma for sintering high-performance copper tungsten electrical contact materials

A discharge plasma and contact material technology, applied in the direction of circuits, electric switches, electrical components, etc., can solve the problems of thermal conductivity, arc ablation resistance and mechanical properties, large difference in melting point, long sintering time, etc. To achieve the effect of short sintering time, fast heating speed and uniform grain

Active Publication Date: 2014-09-03
福建国福天合电气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since tungsten and copper are typical pseudo-alloys, the two are incompatible with each other, and the melting points of the two have a large difference. Therefore, it is difficult to obtain a higher density (relative density <97% ), which adversely affects the thermal conductivity, arc ablation resistance and mechanical properties of the material, and the sintering time is long, the energy consumption is large, and most of them use sintering aids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Copper-tungsten composite powder is prepared by mixing tungsten powder with mass ratio of 70% and copper powder with 30% content, and put it into graphite mould. Put the graphite mold into the discharge plasma sintering furnace, apply a pressure of 60 MPa to the copper-tungsten composite powder, and vacuumize the sintering furnace, and the vacuum degree is lower than 10 -1 Under the condition of Pa, the temperature was raised to 900°C at a heating rate of 300°C / min, kept for 25 minutes, and finally cooled to room temperature with the furnace to prepare copper-tungsten electrical contact materials.

[0020] Embodiment 1 makes the performance of copper-tungsten electrical contact material as follows:

[0021] Density: 99%;

[0022] Conductivity: 4.7μΩ.cm;

[0023] Hardness (HB): 242.

Embodiment 2

[0025] Prepare copper-tungsten composite powder with 80% tungsten powder and 20% copper powder by mass ratio, and put it into graphite mould. Put the graphite mold into the discharge plasma sintering furnace, apply a pressure of 20 MPa to the copper-tungsten composite powder, and vacuumize the sintering furnace, and the vacuum degree is lower than 10 -1 Under the condition of Pa, the temperature was raised to 1200°C at a heating rate of 100°C / min, kept for 5 minutes, and finally cooled to room temperature with the furnace to prepare copper-tungsten electrical contact materials.

[0026] Embodiment 2 makes the performance of copper-tungsten electrical contact material as follows:

[0027] Density: 97%;

[0028] Conductivity: 4.3μΩ.cm;

[0029] Hardness (HB): 262.

Embodiment 3

[0031] Copper-tungsten composite powder is prepared by mixing tungsten powder with mass ratio of 75% and copper powder with 25% content, and put it into graphite mould. Put the graphite mold into the discharge plasma sintering furnace, apply a pressure of 40MPa to the copper-tungsten composite powder, pass inert gas into the sintering furnace, raise the temperature to 1100°C at a heating rate of 200°C / min, keep it for 15min, and finally cool down with the furnace to room temperature, the copper-tungsten electrical contact material is prepared.

[0032] Embodiment 3 makes the performance of copper-tungsten electrical contact material as follows:

[0033] Density: 98.5%;

[0034] Conductivity: 4.6μΩ.cm;

[0035] Hardness (HB): 256.

[0036] The density of the copper-tungsten alloy electrical contact material is measured by the Archimedes method, the electrical conductivity of the material is measured by the FQR7501A eddy current conductivity meter, and the hardness of the mat...

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Abstract

The invention discloses a method for adopting spark plasma for sintering high-performance copper tungsten electrical contact materials. According to the method, tungsten powder and copper powder are prepared into copper tungsten composite powder and placed into a graphite mould; the graphite mould is placed into a spark plasma sintering furnace, the pressure of 20 MPa to 60 MPa is applied on the copper tungsten composite powder, inert gas is introduced into the sintering furnace, or the sintering furnace is vacuumized, the sintering temperature ranges from 900 DEG C to 1200 DEG C, heat is preserved for 5 minutes to 25 minutes, finally the copper tungsten composite powder is cooled to the room temperature along with the furnace to manufacture the copper tungsten electrical contact materials. In comparison with a traditional sintering process, the spark plasma sintering method is the integrated sintering technology integrating hot pressing, plasma activating and resistance heating and has the advantages that the temperature rises fast, sintering time is short and crystal grains are uniform, the fine structure of a sintered body can be controlled easily, and therefore the obtained materials are high in compactness and good in performance.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for spark plasma sintering a high-performance copper-tungsten alloy electrical contact material. Background technique [0002] With the continuous construction of my country's west-to-east power transmission, north-south mutual supply, and cross-regional networking, the load of my country's high-voltage power transmission and transformation network is increasing day by day, and the system capacity is constantly increasing. Key trends in power transmission. For electrical contacts, key components of power systems, W-Cu contact materials are widely used in various circuit breakers and vacuum load switches due to their excellent properties such as arc erosion resistance, welding resistance and high strength. and on the transformer transfer switch. However, since tungsten and copper are typical pseudo-alloys, the two are incompatible with each other, and the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22C27/04H01H11/04
Inventor 阮秀仕吴鹏曹大力赵清海赵勇胜
Owner 福建国福天合电气科技有限公司
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