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Preparation method of silver graphite electrical contact with continuous pure silver layer on side

A silver-graphite, electrical contact technology, used in circuits, electrical switches, electrical components, etc., can solve the problems of poor welding resistance, limited specifications, and difficult processing, and achieve good welding resistance and deformation. The effect of reducing and increasing the service life

Active Publication Date: 2022-05-27
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silver-graphite electric contact produced by extrusion process has graphite particles distributed in fibrous form, and the bonding strength of silver and graphite is high. It is used in electrical appliances and has a high mechanical life. The disadvantage of the process is: the vertical fiber structure , its anti-welding ability is not good, and the yield is low; with parallel fiber structure, the processing is difficult, the specifications are limited, and the bonding strength of the silver layer is not good, the yield is low

Method used

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  • Preparation method of silver graphite electrical contact with continuous pure silver layer on side

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Mix 19kg of silver powder with 1kg of graphite powder to get AGC5 mixing powder;

[0027] 2) The AgC5 mixed powder is pressed and molded by molding method;

[0028] 3) Put the press blank in the sintering furnace and sinter it, keep warm at 940 °C for 2 hours, hydrogen protection;

[0029] 4) Press the blank with 11t / cm 2 Pressure is carried out for compound pressure;

[0030] 5) The pressing blank is placed in the decarburization furnace at 600 °C for decarburization;

[0031] 6) The product is divided into two from the middle position of the thickness to get two contacts;

[0032] 7) Grind and polish the contacts, then dry them to obtain any structure of silver graphite electric contacts with a continuous sterling silver layer on the side.

[0033] The present embodiment finally obtains an arbitrary structure having a continuous sterling silver layer on the side of the AGC5 electric contact, compared with the conventional arbitrary structure AGC5 electric contact, the ...

Embodiment 2

[0035] 1) Mix 48kg silver powder with 2kg graphite powder to obtain AGC4 mixing powder;

[0036] 2) The AgC4 mixed powder is pressed and molded by molding method;

[0037] 3) Put the pressing blank in the sintering furnace and sinter it, keep warm at 900 °C for 3 hours, hydrogen protection;

[0038] 4) Press the blank with 10t / cm 2 Pressure is carried out for compound pressure;

[0039] 5) Place the press blank in the decarburization furnace at 700 °C to decarburize;

[0040] 6) Mill off one side of the silver layer of the product with special equipment, and retain the other side of the silver layer for welding to obtain a single-piece contact;

[0041] 7) Grind and polish the contacts, then dry them to obtain any structure of silver graphite electric contacts with a continuous sterling silver layer on the side.

Embodiment 3

[0043] 1) Mix 9.7kg silver powder with 0.3kg graphite powder to obtain AgC3 mixing powder;

[0044] 2) The AgC3 mixed powder is pressed and molded by molding method;

[0045] 3) Put the press blank in the sintering furnace and sinter it, keep warm at 860 °C for 4 hours, hydrogen protection;

[0046] 4) Press the blank with 9t / cm 2 Pressure is carried out for compound pressure;

[0047] 5) Place the press blank in the decarburization furnace at 800 °C to decarburize;

[0048] 6) The product is divided into two from the middle position of the thickness to get two contacts;

[0049] 7) Grind and polish the contacts, then dry them to obtain any structure of silver graphite electric contacts with a continuous sterling silver layer on the side.

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Abstract

The invention discloses a method for preparing a silver-graphite electric contact with a continuous pure silver layer on the side, and the technical scheme includes the following steps: (1) powder mixing, uniformly mixing silver powder and graphite powder; (2) preliminary pressing; (3) ) sintering, sintering the compact under a reducing atmosphere; (4) repressing, repressing the sintered compact; (5) heating the recompact in compressed air for decarburization; (6) cutting or milling processing, the silver-graphite base after decarburization is divided into two, obtains two contacts; perhaps milling off one side silver layer, obtains single contact; (7) cleaning, will pass through step ( 6) The obtained contacts are subjected to grinding, polishing and drying treatment to obtain finished products. The silver-graphite electrical contact prepared by the invention has graphite distributed in any structure, and the contact has strong welding resistance; the side has a continuous pure silver layer, and the contact has a long mechanical life.

Description

Technical field [0001] The present invention relates to the field of electrical contact materials science, specifically refers to a silver graphite electric contact having a continuous layer of sterling silver on the side and a preparation method thereof. Background [0002] The silver graphite electric contact produced by powder metallurgy process has good conductivity and thermal conductivity and anti-fusion welding performance, and is widely used in low-voltage electrical appliances such as small circuit breakers and molded case circuit breakers. [0003] The processing technology of silver graphite electric contact, according to the molding method, can be divided into two processes: molding and extrusion. Among them, the molding process is to fill the silver graphite powder and silver powder into the mold cavity for single-piece pressing, and the pressing blank is divided into two layers: the silver graphite layer is the working layer, the silver layer is the welding layer, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H69/00H01H11/04
CPCH01H69/00H01H11/04
Inventor 费家祥宋振阳林旭彤刘映飞宋林云李小珍孔欣林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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