A kind of electric contact material and preparation method thereof

An electrical contact material and copper alloy technology are applied in the field of graphene-enhanced copper-based electrical contact composite materials and their preparation to achieve the effects of reducing production costs, improving wear resistance, and avoiding uneven distribution of alloying elements

Active Publication Date: 2017-12-05
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is room for further improvement in the performance of electrical contact materials

Method used

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  • A kind of electric contact material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) The alloy powder containing 0.15% bismuth, 0.1% zinc and 99.75% copper is made into 200 mesh copper alloy powder by gas atomization method.

[0021] (2) Graphene and copper-0.15% bismuth-0.1% zinc alloy powder with 1-5 layers are loaded into the ball mill at a weight ratio of 0.1:99.9. 100r / min, in the process of ball milling and mixing, forward ball milling for 15 minutes, stop for 5 minutes, counterclockwise ball milling for 15 minutes, stop for 5 minutes, work alternately according to this, ball milling time is 6 hours, and obtain a powder evenly mixed with graphene and copper alloy .

[0022] (3) Put the mixed powder into the mold for cold pressing, the pressure is 600MPa, and the holding time is 3 minutes. Put the cold-pressed block into the vacuum sintering furnace (vacuum degree: 1.0*10 -3 Pa) for sintering, the sintering temperature is 700°C, and the holding time is 4 hours.

[0023] (4) The blank is secondary molded, the pressure is 200MPa, and the holdi...

Embodiment 2

[0025] (1) The alloy powder containing 0.5% bismuth, 3.0% zinc and 96.5% copper is made into 300 mesh copper alloy powder by gas atomization method.

[0026] (2) Graphene and copper-0.5% bismuth-3.0% aluminum alloy powder with a layer number of 1-10 are loaded into the ball mill at a weight ratio of 0.2:99.8. 250r / min, during the mixing process of ball milling, forward ball milling for 20 minutes, stop for 5 minutes, counterclockwise ball milling for 20 minutes, stop for 5 minutes, work alternately according to this, ball milling time is 2 hours, and obtain evenly mixed powder of graphene and copper alloy .

[0027] (3) Put the mixed powder into the mold for cold pressing, the pressure is 400MPa, and the holding time is 3 minutes. Put the cold-pressed block into the vacuum sintering furnace (vacuum degree: 5.0*10 -1 Pa) for sintering, the sintering temperature is 900°C, and the holding time is 2 hours.

[0028] (4) Secondary molding of the blank with a pressure of 500MPa an...

Embodiment 3

[0030] (1) The alloy powder containing 0.4% bismuth, 1.0% zinc and 98.6% copper is made into 200 mesh copper alloy powder by gas atomization method.

[0031] (2) Put graphene and copper-0.4% bismuth-1.0% zinc alloy powder with layers of 1-10 layers into the ball mill at a weight ratio of 0.2:99.8. The ball mill tank is first evacuated and then filled with inert gas for protection. The rotation speed is 200r / min. During the mixing process of ball milling, mill clockwise for 20 minutes, stop for 5 minutes, counterclockwise ball mill for 20 minutes, stop for 5 minutes, and work in this cycle. The total mixing time is 3 hours, and the graphene and copper alloy are uniformly mixed. of powder.

[0032] (3) Put the mixed powder into the mold for cold pressing, the pressure is 400MPa, and the holding time is 3 minutes. Put the cold-pressed block into the vacuum sintering furnace (vacuum degree: 1.0*10 -1 Pa) for sintering, the sintering temperature is 750°C, and the holding time is ...

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Abstract

The invention relates to an electrical contact material, in particular to a graphene reinforced copper-based electrical contact composite material and a preparation method of the material. The electrical contact material is prepared from, by weight, graphene 0.1-1.0% and copper alloy 99.0-99.9%. The preparation method comprises the steps of copper alloy atomization, ball milling and powder mixing, primary molding, sintering, secondary molding and sintering. The graphene is added in the copper alloy to serve as a framework of the electrical contact material, so that reduction of electrical conductivity and thermal conductivity is avoided while the material has high hardness, mechanical shock resistance performance and arc ablation resistance performance. A cold-pressing molding sintering preparation technology is adopted in the preparation method, the production cost is reduced, and the electrical contact material is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an electric contact material and a preparation method thereof, in particular to a graphene-reinforced copper-based electric contact composite material and a preparation method thereof. Background technique [0002] The vacuum contact material is an important factor affecting the breaking performance of the vacuum switch. The contact material is required to have high electrical conductivity, high thermal conductivity, high mechanical strength and low contact resistance. The vacuum switch does not need to be overhauled, and the contacts need to withstand at least 8-12 times, and the rated short-circuit current of 30-50 times will burn the contacts, so the contact material should have good arc resistance and melting resistance. Solderability. Currently commonly used copper-bismuth alloy has good welding resistance, low current carrying value, and certain breaking capacity, but its strength is low, and the arc erosion is large, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C9/04C22C9/01C22C1/05B22F9/04B22F3/16
CPCB22F3/16B22F9/04B22F2009/043B22F2999/00C22C1/05C22C9/00C22C9/01C22C9/04B22F3/1007B22F2201/20
Inventor 冷金凤刘易时传霞李志伟纪霞
Owner UNIV OF JINAN
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