Manufacturing method of silver-tungsten carbide-carbon electrical contact material

A technology of electric contact material and tungsten carbide, applied in contact materials, circuits, electric switches, etc., to achieve high hardness, high corrosion resistance, and good welding resistance

Inactive Publication Date: 2005-08-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preferred orientation of WC in the Ag matrix is ​​realized to improve the AgWC 12 C 3 Research on the properties of electrical contact materials has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: 1. take by weight the silver powder of 51g, average length is 2-5um, aspect ratio is 7.2g of plate-like WC powder of 3-5, and 1.44g average particle size is at 2~50 μ m, density 2.2~ 2.3g / cm 3 2. 51 grams of Ag powder are fully dissolved in concentrated nitric acid to prepare silver nitrate solution; 3. .Add the prepared silver nitrate solution into the reaction vessel and complex it with ammonia water until the pH value is 10; then add the above-mentioned mixture into the reaction vessel while stirring; 4. Keep stirring, and mix the pre-prepared The reducing agent hydrazine hydrate is added into the reaction vessel in the form of liquid phase spray through the atomization device, and fully reacted; 5. After the above-mentioned composite powder is washed with distilled water until it is neutral, it is dried in a dryer at a temperature of 90°C to obtain dried Silver-coated plate-shaped grain tungsten carbide and graphite composite powder; 6. The dry coat...

Embodiment 2

[0022] Example 2: The preparation steps in this example are basically the same as those in the above example, except that the amount of silver powder is 49.7g, and 0.3g of additive Co powder is added, and sintered in a sintering furnace at a temperature of 840°C for 4.5 hours, finally at 13.5T / cm 2 Recompression molding under the pressure; finally made AgWC 12 C 3 electrical contact material.

Embodiment 3

[0023] Example 3: The preparation steps in this example are basically the same as those in the above example, the difference is that the amount of silver powder is 49.7g, and 0.3g of additive Ni powder is added, and sintered in a sintering furnace at a temperature of 800°C for 4.5 hours, finally at 16.5T / cm 2 Recompression molding under the pressure; finally made AgWC 12 C 3 electrical contact material.

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PUM

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Abstract

This invention relates to a manufacturing method of a silver-tungsten carbide-carbon electric contactor. It adopts silver powder, tungsten carbide and graphite powder as the raw materials and manufactures the silver-tungsten carbide-carbon electric contactor material through chemical coating and solid agglomeration techniques, and belongs to the field of electric components breaker switch manufacturing technology. The characteristic of this invention is: adopt silver powder, slab tungsten carbide powder, graphite powder and a little additive metal powder as the raw materials. At first mix the slab tungsten carbide powder, the graphite powder and the additive metal powder, and use chemical coating technique to get silver coating compound powder, and then pass through cold roll forming, agglomeration, re-rolling to get AgWC12C3 electric contactor material with tungsten carbide grains arrayed directionally. The AgWC12C3 electric contactor material made by this invention has fine compactness, high rigidity and conductive power. This material can be applied to many kinds of breakers with large capacity, the breakers with plastic covers and automatic switches.

Description

technical field [0001] The invention relates to a method for manufacturing a silver-tungsten carbide-carbon electrical contact material, which belongs to the technical field of manufacturing technology of circuit breaker switch electrical components. Background technique [0002] Silver-tungsten carbide-carbon-based electrical contact material is a low-cost silver contact material promoted in my country, which has successfully replaced AgC 5 , so that the silver-saving work of contact materials in my country has advanced a step forward, and its physical and mechanical properties have surpassed that of AgC 5 , Widely used in automatic switches, large-capacity circuit breakers, molded case circuit breakers and some other switches. Ag-WC-C series electrical contacts mainly use the good electrical conductivity and thermal conductivity of Ag, and the high melting point, high hardness and good wear resistance of WC. They can withstand strong arc corrosion and have good resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06H01H1/02H01H11/02
Inventor 朱丽慧黄清伟项兢陆尧胡向平
Owner SHANGHAI UNIV
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