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Electrical contact material and preparation method thereof

A technology for electrical contact materials and copper alloys, applied in the field of graphene-reinforced copper-based electrical contact composite materials and its preparation, to achieve the effects of reducing production costs, improving wear resistance, and avoiding uneven distribution of alloying elements

Active Publication Date: 2016-03-09
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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  • Electrical contact material and preparation method thereof

Examples

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.

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

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

[0023] (4) Secondary molding of th...

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 with 1-10 layers and copper-0.5% bismuth-3.0% aluminum alloy powder are loaded into the ball mill in a weight ratio of 0.2:99.8. The ball mill tank is first evacuated and then protected by argon gas. 250r / min, in the process of ball milling and powder mixing, forward ball milling for 20 minutes, stop for 5 minutes, counterclockwise ball milling for 20 minutes, stop for 5 minutes, and work alternately, and the ball milling time is 2 hours to obtain a uniformly 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 pressure holding time is 3 minutes. Put the cold pressed block into a vacuum sintering furnace (vacuum degree: 5.0*10 -1 Pa) Medium sintering, sintering temperature 900℃, holding time 2 hours.

[0028] (4) Secondary mo...

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.

[0031] (2) Load 1-10 layers of graphene and copper-0.4% bismuth-1.0% zinc alloy powder into the ball mill at a weight ratio of 0.2:99.8. The ball mill tank is evacuated and then protected by inert gas. Rotation speed 200r / min, in the process of ball milling and powder mixing, clockwise ball milling for 20 minutes, stop for 5 minutes, counterclockwise ball milling for 20 minutes, stop for 5 minutes, and work in this cycle. The total mixing time is 3 hours to obtain a uniform mixture of graphene and copper alloy. Powder.

[0032] (3) Put the mixed powder into the mold for cold pressing, the pressure is 400MPa, and the pressure holding time is 3 minutes. Put the cold pressed block into a vacuum sintering furnace (vacuum degree: 1.0*10 -1 Sintering in Pa), the sintering temperature is 750℃, and the holding time is 2 hours.

[0033] (4) Seconda...

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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 electrical contact material and a preparation method thereof, in particular to a graphene reinforced copper-based electrical 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 as many as 30-50 times. The rated short-circuit current will burn the contacts. Therefore, the contact materials should have good arc resistance and melting resistance. Weldability. At present, the commonly used copper-bismuth alloy has good welding resistance, low current-carrying value, and certain breaking capacity, but its strength is low and arc eros...

Claims

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Application Information

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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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