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Preparation method of silver-nickel-graphite electrical contact with continuous decarburization layer on side surface

A technology of decarburization layer and electrical contacts, applied in the direction of contacts, circuits, electrical switches, etc., can solve the problems of high service life, high material cost, general anti-welding ability, etc., to improve mechanical life, improve hardness, The effect of good resistance to fusion welding

Active Publication Date: 2021-08-13
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the static points of miniature circuit breakers are basically extruded silver graphite materials. The advantage is that the service life is long, and the disadvantage is that the material cost is high and the anti-welding ability is average.

Method used

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  • Preparation method of silver-nickel-graphite electrical contact with continuous decarburization layer on side surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) 18.6kg silver powder, 0.4kg nickel powder and 1kg graphite powder are mixed uniformly to obtain AgNi2C5 mixed powder;

[0028] 2) AgNi2C5 mixed powder is pressed into shape by molding method;

[0029] 3) Put the compact into a sintering furnace for sintering, heat it at 940°C for 2 hours, and protect it with hydrogen;

[0030] 4) Use 11t / cm 2 The pressure is repressurized;

[0031] 5) Decarburizing the compact in a decarburization furnace at 600°C;

[0032] 6) Cut the product into two parts from the middle of the thickness to obtain two pieces of contacts;

[0033] 7) Cleaning, grinding, polishing and drying the contacts;

[0034] 8) Annealing, the product is annealed in a sintering furnace under the protection of hydrogen at 600°C for 2 hours to obtain the final product, or further re-solder on this basis to obtain the final product.

[0035] This embodiment finally obtains the AgNi2C5 electrical contact of any structure with a continuous decarburization layer ...

Embodiment 2

[0037] 1) 47kg silver powder, 1kg nickel powder and 2kg graphite powder are mixed uniformly to obtain AgNi2C4 mixed powder;

[0038] 2) AgNi2C4 mixed powder is pressed into shape by molding method;

[0039] 3) Put the compact into a sintering furnace for sintering, heat it at 900°C for 3 hours, and protect it with hydrogen;

[0040] 4) Use 10t / cm 2 The pressure is repressurized;

[0041] 5) Decarburizing the compact in a decarburization furnace at 700°C;

[0042] 6) Mill one side of the silver layer of the product with special equipment, and keep the other side of the silver layer for welding to obtain a single-chip contact;

[0043] 7) Cleaning, grinding, polishing and drying the contacts;

[0044] 8) Annealing, the product is annealed in a sintering furnace under the protection of hydrogen at 500°C for 3 hours to obtain the final product, or further re-soldering on this basis to obtain the final product.

Embodiment 3

[0046] 1) 9.4kg silver powder, 0.3kg nickel powder and 0.3kg graphite powder are mixed uniformly to obtain AgNi3C3 mixed powder;

[0047] 2) AgNi3C3 mixed powder is pressed into shape by molding method;

[0048] 3) Put the green compact in a sintering furnace for sintering, heat it at 860°C for 4 hours, and protect it with hydrogen;

[0049] 4) Use 9t / cm for the green compact 2 The pressure is repressurized;

[0050] 5) Decarburizing the compact in a decarburization furnace at 800°C;

[0051] 6) Cut the product into two parts from the middle of the thickness to obtain two pieces of contacts;

[0052] 7) Cleaning, grinding, polishing and drying the contacts;

[0053] 8) Annealing, the product is annealed in a sintering furnace under the protection of hydrogen at 400°C for 4 hours to obtain the final product, or further re-solder on this basis to obtain the final product.

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Abstract

The invention discloses a preparation method of a silver-nickel-graphite electrical contact with a continuous decarburization layer on the side surface. The preparation method comprises the following steps of (1) powder mixing, specifically, uniformly mixing silver powder, nickel powder and graphite powder; (2) initial pressing molding; (3) sintering, specifically, sintering a pressed blank in a reducing atmosphere; (4) re-pressing, specifically, re-pressing the sintered pressed blank to obtain a re-pressed blank; (5) decarburizing, specifically, the re-pressed blank is placed in compressed air to be heated for decarburization, and therefore the continuous decarburization layer is formed on the surface of the re-pressed blank; (6) cutting or milling, specifically, dividing the decarburization silver-nickel-graphite blank into two parts to obtain two contacts; or milling off the silver layer on one side to obtain a single contact; (7) cleaning, specifically, grinding, polishing and drying the contact obtained in the step (6); and (8) annealing, specifically, annealing the cleaned product in a reducing atmosphere, reducing the oxidized nickel back through annealing, and obtaining a finished product. According to the silver-nickel-graphite electrical contact prepared by the method, graphite is distributed into any structure, the fusion welding resistance of the contact is high, the side edge is provided with a continuous decarburization layer, and the mechanical life of the contact is long.

Description

technical field [0001] The invention relates to the field of electrical contact material science, in particular to a method for preparing a silver-nickel-graphite electrical contact with a continuous decarburized layer on the side and a product thereof. Background technique [0002] Silver-nickel-graphite electrical contacts produced by powder metallurgy technology are mainly used as static points in frame circuit breakers. Since part of the silver is replaced by nickel, the material cost is relatively low. [0003] The processing technology of silver-nickel-graphite electrical contacts is mainly a molding process, which is to fill the mixed powder of graphite powder, nickel powder and silver powder into the mold cavity for single-piece pressing. The compact is divided into two layers: the silver-nickel-graphite layer is the working layer , In addition, a silver layer is covered as a solder layer, which is processed into a chip contact through sintering, repressing and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F3/24H01H1/023H01H1/027H01H11/04C22C5/06C22C1/05
CPCB22F3/16B22F3/24H01H1/023H01H1/027H01H11/048C22C5/06C22C1/05B22F2003/248B22F2003/247B22F2999/00B22F2201/32B22F2201/01
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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