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A kind of graphene-reinforced copper-rare earth-based electrical contact material and preparation method thereof

An electric contact material, graphene technology, applied in the direction of contacts, circuits, electric switches, etc., can solve the problems of reducing the electrical conductivity and thermal conductivity of copper contact materials, and the difficulty in obtaining comprehensive performance of copper-based contact materials, etc., to achieve ultimate The effect of high density, low production cost and high wear resistance

Active Publication Date: 2018-03-02
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above three patents all improve the corrosion resistance and oxidation resistance of copper alloys through the addition of rare earth or rare earth oxides, but at the same time, due to the addition of low-conductivity materials such as ceramic particles, molybdenum or chromium, the corrosion resistance of copper alloys is reduced to a certain extent. The electrical and thermal conductivity of contact materials makes it difficult to obtain copper-based contact materials with excellent comprehensive properties

Method used

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  • A kind of graphene-reinforced copper-rare earth-based electrical contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) The copper-rare earth alloy is made into 200-mesh alloy powder by centrifugal atomization method, the rare earth in the copper-rare earth is cerium-rich mixed rare earth metal, and the weight content is 0.05% of the copper-rare earth alloy.

[0032] (2) Graphene and alloy powder are put into a ball mill and mixed in a weight ratio of 0.1:99.9 to make a uniformly mixed powder. Graphene is 1-10 layers. The process parameters of the ball mill are: the ball mill tank is evacuated first and then argon protection is introduced, the speed is 100r / min, the ball mill is 15 minutes, stop for 5 minutes, rotate clockwise and counterclockwise alternately, and the total mixing time is 6h.

[0033] (3) Put the powder mixed in step (2) into the mold for cold press molding, the pressure is 400MPa, and the holding time is 5 minutes. The cold-pressed parts are sintered under the protection of argon, and the vacuum degree is 1.0*10 -3 Pa, the sintering temperature is 900°C, and the ho...

Embodiment 2

[0036] (1) The copper-rare earth alloy is made into 300-mesh alloy powder by ultrasonic atomization. The rare earth in the copper-rare earth is lanthanum-rich mixed rare earth metal, and the weight content is 0.5% of the copper-rare earth alloy.

[0037] (2) Put graphene and alloy powder into a ball mill and mix them in a weight ratio of 3.0:97.0 to make a uniformly mixed powder. Graphene is 1-10 layers. The process parameters of the ball mill are: the ball mill tank is evacuated first and then argon protection is introduced, the speed is 250r / min, the ball mill is 10 minutes, stop for 5 minutes, rotate clockwise and counterclockwise alternately, and the total mixing time is 2h.

[0038] (3) Put the powder mixed in step (2) into the mold for cold press molding, the pressure is 600MPa, and the holding time is 3 minutes. The cold-pressed molded parts are sintered under the protection of hydrogen, and the vacuum degree is 5.0*10 -1 Pa, the sintering temperature is 700°C, and the...

Embodiment 3

[0041] (1) The copper-rare earth alloy is made into 200-mesh alloy powder by gas atomization method, the rare earth is cerium-rich mixed rare earth metal, and the weight content is 3.0% of the copper-rare earth alloy.

[0042] (2) Put the graphene and alloy powder into a ball mill and mix the powder in a weight ratio of 2:98 to make a uniformly mixed powder. Graphene is 1-10 layers. The process parameters of the ball mill are: the ball mill tank is evacuated first and then argon protection is introduced, the speed is 200r / min, the ball mills for 15 minutes, stops for 5 minutes, rotates clockwise and counterclockwise alternately, and the total mixing time is 2h.

[0043] (3) Put the powder mixed in step (2) into the mold for cold press molding, the pressure is 500MPa, the pressure holding time is 3 minutes, the cold pressed molded parts are sintered under the protection of argon, and the vacuum degree is 1.0*10 -1 Pa, the sintering temperature is 750°C, and the holding time is...

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Abstract

The invention relates to a graphene reinforced copper-rare earth based electrical contact material and a preparing method thereof. The electrical contact material comprises, by weight, 0.1-3.0% of graphene and 97.0-99.9% of copper-rare earth alloy, and rare earth accounts for 0.05-3.0% of the total weight of copper-rare earth alloy. The preparing method comprises the steps of powder atomization, ball milling and powder mixing, cold press molding, sintering, secondary forming and sintering. By adding a graphene reinforcing body to copper alloy to serve as the framework, the material has high hardness, high wear resistance, high mechanical impact resistance and high welding resistance. By adding rare earth, the oxidation resistance and electric arc erosion resistance of the copper alloy electrical contact material are improved.

Description

technical field [0001] The invention relates to an electrical contact material, in particular to a graphene-reinforced copper-rare earth based electrical contact material, and a preparation method of the above material. Background technique [0002] Electrical contact materials are key components of instruments and meters, and play an important role in the life and reliability of instruments and meters. Copper-based contact materials have partially replaced silver-based contacts in recent years due to their low price, electrical conductivity, and thermal conductivity similar to silver, which greatly reduces the loss of precious metal silver. However, because the copper contact material is easily oxidized, copper oxide and cuprous oxide with low resistivity are produced, which increases the contact resistance of the contact element and makes it easy to heat up during use, resulting in the reliability of the contact material. and reduced service life. [0003] The existing p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/05H01H1/025H01H1/027
CPCC22C1/05C22C9/00H01H1/025H01H1/027
Inventor 冷金凤周国荣滕新营耿浩然
Owner UNIV OF JINAN
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