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Preparation method of flake silver graphite electrical contact material

A technology of electric contact material, silver graphite, applied in circuits, electric switches, electrical components, etc., can solve problems such as direct contact with brittle phase graphite, achieve excellent mechanical and physical properties and processing properties, and the preparation method is simple and reduces direct contact. The effect of contact

Active Publication Date: 2016-05-04
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention also has the problem of direct contact between the brittle phase graphite and the silver particles

Method used

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  • Preparation method of flake silver graphite electrical contact material
  • Preparation method of flake silver graphite electrical contact material
  • Preparation method of flake silver graphite electrical contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) First calculate the required silver carbonate (Ag 2 CO 3 ) powder and graphite powder (C) consumption, take silver carbonate powder (average particle size is 6 μ m) 12.65kg, graphite powder (average particle size is 5 μ m) 0.1kg, standby;

[0029] 2) above-mentioned silver carbonate powder and graphite powder are carried out powder mixing on double-cone mixer, rotating speed 25r / min, time 2h, obtain silver carbonate graphite (Ag 2 CO 3 C) mixed powder;

[0030] 3) the silver carbonate graphite mixed powder after the above-mentioned mixed powder is molded on an isostatic press, and the molding pressure is 120MPa, and the silver carbonate graphite blank ingot after molding is placed in vacuum with 150 ℃ of temperature roasting 4h, obtains silver graphite ( AgC) ingot;

[0031] 4) the silver graphite ingot that above-mentioned roasting obtains is placed in hydrogen (H 2 ) sintering at 880°C for 8 hours in an atmosphere;

[0032] 5) decarburizing the above-mentione...

Embodiment 2

[0036] 1) First calculate the required silver carbonate (Ag 2 CO 3 ) and graphite powder (C) consumption, take silver carbonate powder (average particle size is 6 μ m) 12.01kg, graphite powder (average particle size is 5 μ m) 0.6kg, standby;

[0037] 2) above-mentioned silver carbonate powder and graphite powder are carried out powder mixing on double-cone mixer, rotating speed 25r / min, time 2h, obtain silver carbonate graphite (Ag 2 CO 3 C) mixed powder;

[0038] 3) the silver carbonate graphite mixed powder after the above-mentioned mixed powder is molded on an isostatic press, and the molding pressure is 150MPa, and the silver carbonate graphite billet after the molding is placed in vacuum with 250 ℃ of temperature roasting 4h, obtains silver graphite ( AgC) ingot;

[0039] 4) the silver graphite ingot that above-mentioned roasting obtains is placed in hydrogen (H 2 ) sintering at 920°C for 4 hours in an atmosphere;

[0040] 5) Decarburizing the above-mentioned sinter...

Embodiment 3

[0044] 1) First calculate the required silver carbonate (Ag 2 CO 3 ) and graphite powder (C) consumption, take silver carbonate powder (average particle size is 6 μ m) 12.14kg, graphite powder (average particle size is 5 μ m) 0.5kg, standby;

[0045] 2) above-mentioned silver carbonate powder and graphite powder are carried out powder mixing on double-cone mixer, rotating speed 40r / min, time 2h, obtain silver carbonate graphite (Ag 2 CO 3 C) mixed powder;

[0046] 3) the silver carbonate graphite mixed powder after the above-mentioned powder mixing is formed on an isostatic press, and the molding pressure is 100MPa, and the silver carbonate graphite blank ingot after forming is placed in vacuum with 280 ℃ of temperature roasting 2h, obtains silver graphite ( AgC) ingot;

[0047] 4) the silver graphite ingot that above-mentioned roasting obtains is placed in hydrogen (H 2 ) sintering at 900°C for 5 hours in an atmosphere;

[0048] 5) Decarburizing the above-mentioned sint...

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Abstract

The invention discloses a preparation method of a flake silver graphite electrical contact material. Particularly, the method comprises the following steps: calculating required graphite powder and silver carbonate powder according to the material proportions for a to-be-prepared silver graphite electrical contact, and weighing the graphite powder and the silver carbonate powder for later use; mixing the silver carbonate powder with the graphite powder, and obtaining a silver graphite billet coated with a silver layer at the outer side of the billet from the obtained silver carbonate and graphite mixed powder through the procedures of molding, roasting, sintering and decarbonizing; and further processing the silver graphite billet into strips through hot extrusion, and carrying out rolling and stamping to obtain the flake silver graphite electrical contact. According to the method disclosed by the invention, direct contact of brittle phase graphite and silver particles can be effectively reduced; mechanical and physical properties and the processability of the prepared product are relatively excellent; and a metallographic structure is relatively uniform.

Description

technical field [0001] The invention relates to an electric contact material, in particular to a preparation method of a flake silver graphite electric contact material. Background technique [0002] Silver graphite electrical contacts are widely used in low-voltage electrical appliances such as miniature circuit breakers, line protection switches, and fault current protection switches due to their excellent thermal and electrical conductivity and anti-welding properties. Generally speaking, the preparation methods of silver graphite electrical contact materials mainly include powder mixing method and electroless plating method. [0003] The powder mixing method is currently the most commonly used method for domestic and foreign electrical contact manufacturers to produce silver graphite. This method uses mechanical mixing to mix silver powder and graphite powder together, and then the mixed powder is subjected to a series of isostatic pressing, sintering, and extrusion. Pr...

Claims

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Application Information

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IPC IPC(8): H01H11/04B22F3/24B22F3/10B22F3/04
CPCB22F3/04B22F3/1007B22F3/24B22F2003/248H01H11/048
Inventor 张天锦王振宇王奐然李波杨志伟
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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