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Silver-graphite electrical contact material and preparation method thereof

An electrical contact material, silver graphite technology, applied in the direction of contacts, circuits, electrical switches, etc., can solve the problems of short electrical life, large consumption, poor electrical wear resistance, etc., to improve electrical wear resistance and improve densification The effect of high resistance to electrical wear and tear

Active Publication Date: 2010-06-30
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the tendency of graphite to stabilize the arc, the amount of graphite decreases sharply after being oxidized, so the silver graphite material consumes a lot under the arc erosion, and the electrical life is short, so the poor resistance to electrical wear is the biggest defect of the silver graphite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Melt 4990 grams of silver and 10 grams of cerium into a molten silver-cerium alloy in an intermediate frequency furnace. The melting temperature is 1050°C. After the metal is melted, it is kept at this temperature for 10 minutes. The silver-cerium alloy in the molten state is atomized into a powder with a particle size of less than 40 μm under a water pressure of 50 MPa.

[0022] B, getting the average particle size is 100 grams of graphite powder of 60 μm, and the average particle size is 60 μm of titanium aluminum carbon (Ti 3 AlC 2 ) powder 200 grams, the weight ratio of the two is 0.5:1, it is fully mixed, activated in the air at 300 ° C for 2 hours, to obtain graphite, ternary layered cermet composite powder.

[0023] C, the composite powder 300 grams that B step obtains, 21.79 liters of concentrations are the hydrazine hydrate solution of 10 mol / liter, add deionized water and make 100 liters of reducing suspensions;

[0024] D, the ammoniacal liquor of conce...

Embodiment 2

[0029] A, 1747 grams of silver and 18 grams of lanthanum are melted into a molten silver-lanthanum alloy in an intermediate frequency furnace. The melting temperature is 1050°C. After the metal is melted, it is kept at this temperature for 10 minutes. The molten silver-lanthanum alloy is atomized into a powder with a particle size of less than 40 μm under a water pressure of 50 MPa.

[0030] B, getting the average particle size is 282 grams of graphite powder of 60 μm, and the average particle size is 60 μm of titanium aluminum carbon (Ti 3 AlC 2 ) powder 18 grams, the weight ratio of the two is 16:1, it is fully mixed, activated in the air at 500 ° C for 4 hours, to obtain graphite, ternary layered metal-ceramic composite powder.

[0031] C, the composite powder 300 grams that B step obtains, 4.53 liters of concentrations are the hydrazine hydrate solution of 30 mol / liter, add deionized water and make 100 liters of reducing suspensions;

[0032] D, the ammoniacal liquor of...

Embodiment 3

[0037] A, 3675 grams of silver, 35 grams of cerium, and 40 grams of lanthanum are melted into a molten silver-cerium-lanthanum alloy in an intermediate frequency furnace. The melting temperature is 1050°C. After the metal is melted, it is kept at this temperature for 10 minutes. The silver-cerium-lanthanum alloy in the molten state is atomized into a powder with a particle size of less than 40 μm under a water pressure of 50 MPa.

[0038] B, getting the average particle size is 225 grams of graphite powder of 60 μm, and the average particle size is titanium silicon carbon (TiSiC) of 60 μm 3 SiC2 ) powder 75 grams, the weight ratio of the two is 3: 1, it is fully mixed, activated in the air at 400 ° C for 3 hours, to obtain graphite, ternary layered cermet composite powder.

[0039] C, the compound powder 300 grams that B step obtains, 12.79 liters of concentrations are the acetaldehyde solution of 20 mol / liter, add deionized water and make 100 liters of reducing suspensions; ...

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Abstract

The invention relates to a silver-graphite electrical contact material and a preparation method thereof. The electrical contact material contains the main components of 1-8 wt% of graphite, 0.5-2 wt % of ternary layered metal ceramic, 0.1-1 wt% of lanthanum and / or cerium, not greater than 0.1 wt% of impurities and the balance of silver. The preparation method comprises the following steps of: A, atomizing a mixture of the molten silver and the molten lanthanum and / or the molten cerium into silver alloy powder; B, mixing and activating graphite powder and ceramic powder; C, preparing graphite-ceramic composite powder, a reducing agent and deionized water into a granular concentration reducing suspension; D, dropwise adding ammonia water in a silver-ammonia solution prepared in a silver nitrate solution, slowly adding the reducing suspension during severely stirring and then reducing and plating the silver on the surface of the composite powder so that composite powder of silver-plated graphite powder and metal ceramic powder is obtained through precipitation and drying; and E, mixing and sintering the equivalent silver-rare earth alloy powder and silver-plated graphite and metal ceramic powder so that the silver-graphite electrical contact material is obtained. The electrical contact material has the advantages of favorable compactness, high electrical conductivity, high hardness and high electrical wear resistance and arc erosion resistance.

Description

(1) Technical field [0001] The invention relates to the technical field of silver-based electrical contact materials, in particular to a silver-graphite electrical contact material and a preparation method thereof. (2) Background technology [0002] Among the electrical contact materials of low-voltage electrical appliances, silver graphite electrical contact materials are widely used in various circuit breakers for power line protection and motor protection. Because this material has good welding resistance and electrical conductivity, low and stable contact resistance. The matrix of the silver graphite electrical contact material is silver, and the graphite is dispersed in the silver matrix, which has good electrical conductivity. Under arc ablation, graphite is oxidized into carbon dioxide and carbon monoxide, which causes a large number of voids on the contact surface and reduces the welding force between the contacts. Therefore, the silver graphite electrical contact m...

Claims

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Application Information

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IPC IPC(8): H01H1/023H01H11/04C22C5/06C22C1/05
Inventor 李恒范壮军蒋德志魏彤谭光讯
Owner 桂林金格电工电子材料科技有限公司
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