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Process for preparing electric silver/graphite contact material by nano technique

An electrical contact material and nanotechnology technology, which is applied in the field of preparing silver/graphite electrical contact materials by nanotechnology, can solve the problems of uneven distribution of graphite, high material yield, low production cost, etc. The effect of high conductivity and low equipment requirements

Inactive Publication Date: 2003-02-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the powder metallurgy process is simple and easy, with few processes, low equipment requirements, high material yield and low production cost, graphite is unevenly distributed in the material, with poor compactness and low hardness.
German Degussa company has developed an extrusion process for the preparation of silver / graphite electrical contact materials, and has produced silver / graphite electrical contact materials with high density and good extensibility, but has the disadvantage of high production cost

Method used

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  • Process for preparing electric silver/graphite contact material by nano technique
  • Process for preparing electric silver/graphite contact material by nano technique
  • Process for preparing electric silver/graphite contact material by nano technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1. Utilize nanotechnology to prepare silver / graphite electric contact material

[0031] Get commercially available coarse graphite powder in a planetary high-energy ball mill using steel balls and a spherical tank with a rotating speed of 100rpm, a ball-to-powder ratio of 10:1, ball milling for 40 hours, take it out from the spherical tank, and dry it in a desiccator at 80°C. Obtain dry nano-graphite powder. Then add 2.5g of nano-graphite powder into the reaction vessel, and slowly add 920ml of silver nitrate solution complexed with ammonia water to a pH value of 10 and a concentration of 0.5 mol / liter into the reaction vessel while stirring to hydrate 30ml Hydrazine and 50ml of deionized water were configured to form a hydrazine hydrate solution, which was added to the reaction vessel by liquid phase spraying to obtain silver / graphite nano-coated powder. The coated powder was washed with water until neutral, and then dried in a desiccator at 160° C. to obta...

Embodiment 2

[0032] Embodiment 2. Utilize nanotechnology to prepare silver / graphite electric contact material

[0033] Get commercially available coarse graphite powder in a planetary high-energy ball mill using steel balls and a spherical tank with a rotating speed of 200rpm and a ball-to-powder ratio of 25:1, ball mill for 20 hours, take it out from the spherical tank, and dry it at 80°C in a desiccator. Obtain dry nano-graphite powder. Then add 2.5g of nano-graphite powder into the reaction vessel, and slowly add 460ml of silver nitrate solution complexed with ammonia water to a pH value of 10 and a concentration of 1 mol / liter into the reaction vessel while stirring to hydrate the 35ml Hydrazine and 60ml of deionized water were configured to form a hydrazine hydrate solution, which was added to the reaction vessel by spraying the liquid phase to obtain silver / graphite nano-coated powder. The coated powder was washed with water until neutral, and then dried in a desiccator at 120° C. t...

Embodiment 3

[0034] Embodiment 3. Utilize nanotechnology to prepare silver / graphite electric contact material

[0035] Get commercially available coarse graphite powder in a planetary high-energy ball mill using steel grinding balls and a spherical tank with a rotating speed of 250rpm and a ball-to-powder ratio of 30:1, ball mill for 10 hours, take it out from the spherical tank, and dry it at 80°C in a desiccator. Obtain dry nano-graphite powder. Then add 2.7g of nano-graphite powder into the reaction vessel, slowly add 80ml of silver nitrate solution complexed with ammonia water to a pH value of 11, and a concentration of 5 mol / liter into the reaction vessel, and at the same time stir to hydrate 40ml Hydrazine and 70ml of deionized water were configured to form a hydrazine hydrate solution, which was added to the reaction vessel by spraying the liquid phase to obtain silver / graphite nano-coated powder. The coated powder was washed with water until it became neutral, and then dried in a ...

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Abstract

A process for preparing the silver / graphite material as electric contact by use of nanometre technique includes such steps as preparing graphite nanometre powder; adding silver nitrate solution; chemical coating; washing with water; drying and sintering. Its advantages are simple process, low cost and high quality of product.

Description

technical field [0001] The invention relates to a method for preparing a silver / graphite electric contact material by using nanotechnology, and belongs to the technical field of electric contact material manufacture. Background technique [0002] The silver / graphite electrical contact material has good welding resistance and conductivity, low contact resistance and excellent low temperature rise characteristics, and is widely used in various protective appliances, such as circuit breakers, protective motor switches, earth leakage protectors and automobiles Electrical appliances and other weak current systems. In silver / graphite electrical contact materials, silver as a matrix provides good electrical conductivity and does not form stable oxides, so that the contact resistance of the material will not increase sharply during use. Excellent silver / graphite electrical contact materials require components with low resistivity and high hardness. Silver and gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F3/12C22C1/05C22C5/06H01H1/02
Inventor 马学鸣陆尧沈小宇
Owner EAST CHINA NORMAL UNIV
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