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Preparation method for copper and silver core-shell powder electric contact material

A technology of electrical contact materials and powders, which is applied in the field of preparation of copper-silver core-shell powder electrical contact materials, can solve the problems of high resistivity and poor arc erosion resistance, and achieve good anti-welding performance, contact performance and anti-corrosion The effect of good arc erosion performance and simple preparation process

Inactive Publication Date: 2016-06-29
CHANGZHOU OPTICAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: for current Ag / Sn 2 The resistivity of the electrical contact material is too large and the arc corrosion resistance is poor. It provides a solution to the short circuit caused by the migration of silver ions under direct current or humid heat conditions. The ceramic fiber ball mill prepared by lanthanum, strontium nitrate, ethylene glycol and citric acid solution is used to prepare the composite material, and then it is hot-pressed and fired to prepare an electrical contact material. Ion resistance to arc erosion, reducing the resistance of electrical contact materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, in parts by weight, 15 parts of nano copper powder, 50 parts of silver nitrate solution with a mass concentration of 10% and 35 parts of hydrazine hydrate were weighed and placed in a three-necked flask, stirred and mixed for 25 minutes, and after the stirring and mixing was completed, the Add dropwise acetaldehyde with the same mass as hydrazine hydrate into the three-necked flask, and control the dropwise addition time to 10min. After the dropwise addition is completed, let it stand for 25min, and then centrifuge at 1800r / min for 10min, collect the lower sediment and place it at 65°C Under drying for 6 hours, copper-silver core-shell powder was prepared for use; in parts by weight, 20 parts by weight of lanthanum nitrate, 35 parts of strontium nitrate, 25 parts of ethylene glycol and 20 parts of citric acid solution with a mass concentration of 10% were respectively weighed, Mix and stir to prepare a mixed solution, then add anhydrous ethanol to the above mixed ...

example 2

[0020]First, in parts by weight, 20 parts of nano copper powder, 50 parts of silver nitrate solution with a mass concentration of 10% and 30 parts of hydrazine hydrate were weighed and placed in a three-necked flask, stirred and mixed for 27 min. Add dropwise acetaldehyde with the same quality as hydrazine hydrate into the three-necked flask, control the dropwise addition time to 12min, after the dropwise addition is completed, let stand for 27min, and then centrifuge at 2200r / min for 12min, collect the lower sediment and place it at 70°C Under drying for 7h, copper-silver core-shell powder was prepared for use; in parts by weight, 30 parts of lanthanum nitrate, 35 parts of strontium nitrate, 25 parts of ethylene glycol and 10 parts of citric acid solution with a mass concentration of 10% were respectively weighed, The mixture was mixed and stirred to prepare a mixed solution. Then, according to the volume ratio of the mixed solution and absolute ethanol 1:1, anhydrous ethanol ...

example 3

[0023] First, in parts by weight, 25 parts of nano copper powder, 45 parts of silver nitrate solution with a mass concentration of 10% and 25 parts of hydrazine hydrate were weighed and placed in a three-necked flask, stirred and mixed for 30 min, and after the stirring and mixing was completed, the Add dropwise acetaldehyde with the same quality as hydrazine hydrate to the three-necked flask, control the dropwise addition time to 15min, after the dropwise addition is completed, let stand for 30min, and then centrifuge at 2500r / min for 15min, collect the lower sediment and place it at 80°C Under drying for 8h, copper-silver core-shell powder was prepared for use; in parts by weight, 45 parts of lanthanum nitrate, 30 parts of strontium nitrate, 20 parts of ethylene glycol and 5 parts of citric acid solution with a mass concentration of 10% were respectively weighed, Mix and stir to prepare a mixed solution, then add anhydrous ethanol to the above mixed solution according to the ...

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Abstract

The invention relates to a preparation method for a copper and silver core-shell powder electric contact material, and belongs to the technical field of electric contact material preparation. Aiming at the problem that an existing Ag / Sn2 electric contact material is overhigh in resistivity and has poor anti-arc erosion performance, the invention adopts a technical scheme that short circuiting is caused due to the fact that silver ions can easily migrate under a direct current power-on condition or a hot and humid condition, so that the surface of nanometer copper powder is plated with silver, and then ball milling is performed on the nanometer copper powder plated with the silver and ceramic fiber prepared from lanthanum nitrate, strontium nitrate, ethylene glycol and a citric acid solution to prepare a composite material, and then, the composite material is heated and fired to prepare an electric contact material; migration ability of the silver ions is reduced by compounding copper with the silver. The copper and silver core-shell powder electric contact material prepared by the preparation method disclosed by the invention has relatively high fusion welding resistance and relatively good contact performance and anti-arc erosion performance, is prolonged by 10 to 15 percent in service life, has a simple preparation process, and is green and environmental friendly.

Description

technical field [0001] The invention relates to a preparation method of a copper-silver core-shell powder electrical contact material, and belongs to the technical field of electrical contact material preparation. Background technique [0002] Electrical contact is defined as the interface between current-carrying elements of electrical and electronic equipment for the purpose of ensuring circuit continuity, and the components that contain this interface. Electrical bonding materials are the core components and key materials of on-off control and load current electrical appliances (such as switches, starters, relays, instruments, etc.) in power preparation and electrical circuits. , the role of isolation current. Its performance directly affects the reliability, stability, accuracy and service life of electronic and electrical devices. Therefore, electrical contact materials are both the heart and the fatal point of electronic and electrical products. With the development...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B22F3/10H01H1/021
CPCH01H1/021B22F3/10B22F9/24B22F2998/10B22F1/17B22F1/0003B22F3/02
Inventor 王力威高玉刚
Owner CHANGZHOU OPTICAL MATERIAL
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