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A high-density high-strength silver-carbon composite electrical contact material and its preparation method

An electrical contact material, silver-carbon composite technology, applied in metal material coating process, solid-state diffusion coating, coating and other directions, can solve the problems of low strength, poor density, difficult preparation of silver-carbon composite materials, etc. Excellent contact performance, high material strength, and the effect of increasing welding resistance and arc ablation resistance

Active Publication Date: 2021-06-15
KUNMING INST OF PRECIOUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-density, high-strength silver-carbon composite electrical contact material preparation method, which overcomes the difficulties in the preparation of existing silver-carbon composite materials with high carbon content, low strength, poor density, unstable performance, etc. question

Method used

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  • A high-density high-strength silver-carbon composite electrical contact material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 85g of atomized Ag powder (-200 mesh) and 15g of TiZrCuNi (Ti35Zr35Cu15Ni) (-150 mesh), mix them evenly, and then put them into a planetary ball mill for ball milling. The ball milling time is 4h, and the ball-to-material ratio is 5:1 , the speed is 450 rpm.

[0023] (2) Set the density to 1.30g / cm 3 The commercial carbon fiber braided C / C composite material was polished with sandpaper, cleaned with ultrasonic waves, and dried in an oven at a temperature of 100°C for later use.

[0024] (3) Take 5 g of the cut C / C body and embed it in the mixed powder in (1), the mass of the mixed powder is 30 g. Put the sample into a graphite crucible and place it in a vacuum furnace with a vacuum degree of less than 10 -4 pa, heated to 1020°C, held for 1 hour, cooled to room temperature with the furnace, took out the sample, cut off the excess metal, and cut it into Ag-C / C composite electrical contact materials meeting the required size.

[0025] According to the silver-c...

Embodiment 2

[0028] (1) Take 80g of atomized Ag powder (-200 mesh) and 20g of Ti37.5Zr37.5Cu15Ni (-150 mesh), mix them evenly, and then put them into a planetary ball mill for ball milling. The ball milling time is 5h, and the ball-to-material ratio is 5:1 , the speed is 450 rpm.

[0029] (2) Set the density to 1.10g / cm 3 The commercial foam carbon was cut into a certain size, cleaned with ultrasonic waves, and dried in an oven at a temperature of 100°C for later use.

[0030] (3) Take 5 g of the cut foam carbon block and embed it in the mixed powder in (1), the quality of the mixed powder is 35 g. Put the sample into a graphite crucible and place it in a tube furnace with a vacuum of less than 10 -3 pa, heated to 1050°C, held for 1.5h, cooled to room temperature with the furnace, took out the sample to remove excess metal, and cut it into the required contact size to obtain the Ag-C composite electrical contact material.

[0031] According to the silver-carbon composite electrical cont...

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Abstract

The invention discloses a high-density and high-strength silver-carbon composite electrical contact material and a preparation method thereof, belonging to the technical field of electrical contact material preparation. The composition of the silver-carbon composite electrical contact material of the invention is that the carbon content is 5-50 wt%, the additive is 0.5-15 wt%, and the balance is Ag. The preparation method specifically includes: uniformly mixing TiZrCuNi alloy powder and silver powder in a certain proportion, and using high-energy ball milling to achieve mechanical alloying, and the ball milling time is 2 to 5 hours; the prepared carbon skeleton is buried in the mixed powder and placed in a graphite crucible , using vacuum infiltration technology to prepare high-density silver-carbon composite electrical contact materials, infiltration temperature 900 ~ 1100 ℃. The preparation method of the invention is simple, and the prepared silver-carbon composite electrical contact material has the advantages of high carbon content, high density, high strength, good electrical conductivity and excellent electrical contact performance.

Description

technical field [0001] The invention belongs to the field of electrical contact materials, and in particular relates to a high-density and high-strength silver-carbon composite electrical contact material prepared by an infiltration method and a preparation method thereof. Background technique [0002] Silver / carbon (such as carbon fiber, graphite, carbon nanotubes, graphene, etc.) composite material is a good electrical contact material, mainly used in low-voltage switchgear such as circuit breakers, line protection switches, fault current protection switches and important in the motor industry brush material. Different allotropes of carbon, such as carbon fibers, graphite, carbon nanotubes, graphene, etc., have many excellent properties, such as low density, low linear expansion coefficient, excellent friction and wear resistance, and good thermal and electrical conductivity. Carbon material is used in the field of electrical contact materials. On the one hand, it can mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06C22C1/04C22C1/10B22F9/04C23C10/52
CPCB22F9/04B22F2009/043B22F2999/00C22C1/10C22C5/06C23C10/52B22F2201/11
Inventor 李爱坤谢明周文艳王松赵通明聂宝鑫刘满门杨有才陈永泰张吉明胡洁琼王塞北陈松
Owner KUNMING INST OF PRECIOUS METALS
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