Manufacturing method of electrical contact

A manufacturing method and technology of electrical contacts, which are applied to circuits, electrical switches, electrical components, etc., can solve the problems of reducing the bonding strength of product organization, unable to completely eliminate closed pores, etc., and achieve improved infiltration performance, uniform and dense organization, and organization. more effect

Active Publication Date: 2014-12-17
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the infiltration process, this closed cell is isolated from the outside world, and there is no channel around it for the infiltration of conductive metals. At the same time, the diffusion effect cannot completely eliminate the closed cell in the short infiltration process.
Finally, the closed cells remain as defects in the product, reducing the bonding strength of the product tissue

Method used

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  • Manufacturing method of electrical contact
  • Manufacturing method of electrical contact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of liquid pore-forming agent: first place isopropanol in a water-bath heating agitator at a temperature of 50°C, and set the speed at 100rpm, then continuously and slowly add polyacrylate for 5 minutes, and keep warm for 1 hour until it is completely dissolved ;

[0029] To prepare AgW50 electrical contact products: mix Ag powder and W powder in a mass ratio of 30:70 to form a skeleton powder. Put the skeleton powder in the mixer, turn on the mixer, set the speed to 10rpm, then let go of the faucet under the container, drop 3%wt liquid pore-forming agent into the mixer at a constant speed, the flow rate is 0.5L / min, and stir for 5min , and then sieve and dry. The dried powder is pressed into a skeleton in a special mold according to the drawing specifications. Arrange the skeleton on the graphite plate, put it into the sintering furnace, under the protection of hydrogen atmosphere, sinter at 300°C for 1 hour, remove the pore-forming agent, and form a u...

Embodiment 2

[0031] Preparation of liquid pore-forming agent: first place isopropanol in a water bath heating stirrer, the temperature is 70°C, and the speed is set to 300rpm, then continuously and slowly add polyacrylate for 30 minutes, keep warm for 1 hour until it is completely dissolved ;

[0032] To make AgWC40 products, mix Ag powder and WC powder at a mass ratio of 50:50 to form a skeleton powder. Put the skeleton powder in the mixer, turn on the mixer, set the speed to 30rpm, then let go of the faucet under the container, drop 5%wt liquid pore-forming agent into the mixer at a uniform speed, the flow rate is 1L / min, stir for 30min, and then Sieve and dry. The dried powder is pressed into a skeleton in a special mold according to the drawing specifications. Arrange the skeleton on a graphite plate, put it into a sintering furnace, and sinter at 600°C for 5 hours under the protection of a hydrogen atmosphere to remove the pore-forming agent. After the skeleton is cooled, take it o...

Embodiment 3

[0034] Preparation of liquid pore-forming agent: first place isopropanol in a water-bath heating agitator at a temperature of 80°C, and set the speed at 400rpm, then continuously and slowly add polyacrylate for 0.5 hours, and keep warm for 2 hours until it is completely dissolved ;

[0035] To make CuW95 products, mix Cu powder and W powder at a mass ratio of 15:85 to form a skeleton powder. Put the skeleton powder in the mixer, turn on the mixer, set the speed to 50rpm, then let go of the faucet under the container, and drop 0.1%wt liquid pore-forming agent into the mixer at a uniform speed, the flow rate is 2L / min, stir for 50min, and then Sieve and dry. The dried powder is pressed into a skeleton in a special mold according to the drawing specifications. Arrange the skeleton on a graphite plate, put it into a sintering furnace, and sinter at 500°C for 2 hours under the protection of a hydrogen atmosphere to remove the pore-forming agent. After the skeleton is cooled, tak...

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Abstract

The invention relates to a manufacturing method of an electrical contact. A liquid material prepared by dissolving high-molecular polymer in an organic solvent is used as a pore-forming agent; blind holes are eliminated by the pore-forming agent; by eliminating the blind holes and simultaneously leading in a uniform and communicated pore network, infiltration performance of a skeleton is promoted; a smoother passage is created for flowing of conductive metal liquid, so that the conductive metal liquid more sufficiently permeates the skeleton to obtain an infiltration electrical contact product of which the tissues are more uniform and compact and are more firmly combined. The steps of eliminating the blind holes in the skeleton and forming the uniform and communicated pore network are implemented in a mode of leading in the liquid pore-forming agent in the powder manufacturing process and removing the liquid pore-forming agent after the skeleton is formed. By regulating the addition and the adding mode of the pore-forming agent, the form of the pores in the skeleton can be regulated so as to adapt to the requirements of different infiltration systems. The pore-forming agent used by the manufacturing method is the liquid material and can be completely gasified and removed at a specific temperature and liquid or solid residues cannot be formed in the skeleton, so that the skeleton is guaranteed to have excellent infiltration.

Description

Technical field [0001] The present invention involves a manufacturing process of electrical contact, especially a method of making electrical contacts. Background technique [0002] At this stage, the contact material used in the field of low -voltage electrical appliances is usually composed of conductive metal (such as AG, CU, etc.) and enhanced phase particles (such as W, WC, MO, etc.).Among them, the contact materials represented by AGW, AGWC, CUW, CUWC and CUMO are produced by powder metallurgy melting processing. They are widely used in various types of low -pressure circuit breakers and contactors due to their strong burning resistance. [0003] The resistance of arc -resistant arc -resistance of this type of contact material is mainly dominated by enhanced phases such as W or WC inside the tissue: enhanced the addition of granular enhancement effects in the material substrate, so that the intensity of the tentacle material matrix binding intensity increases, and it is not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F3/26H01H11/04
Inventor 宋振阳张秀芳翁桅柏小平林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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