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A kind of modification method of copper-based conductive contact

A conductive contact, copper-based technology, applied in metal material coating process, coating, heating inorganic powder plating, etc., can solve the problems of poor oxidation resistance, arc erosion resistance, large contact resistance, etc.

Active Publication Date: 2021-05-07
江西大乘汽车有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large contact resistance, arc erosion resistance and poor oxidation resistance of copper-based conductive contacts in the prior art, the present invention provides a method for modifying copper-based conductive contacts. The contact resistance of the copper-based conductive contact is reduced, and the electrical conductivity, thermal conductivity, and arc erosion resistance of the contact surface are significantly improved, thereby improving the stability of the entire copper-based conductive contact and extending the service life

Method used

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  • A kind of modification method of copper-based conductive contact

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Embodiment 1

[0025]Embodiment 1: a kind of copper-based conductive contact modification method comprises the following steps: adding graphene powder and hydrophilic surfactant into water to form a mixture, based on the total mass of the mixture, the mass percentage of graphene powder is 0.1%, the mass percentage of hydrophilic surfactant is 0.2%, the purity of graphene powder is ≥99.5%, the particle size of graphene powder is 0.5-5 μm, and the hydrophilic surfactant is polyvinylpyrrolidone, poly The molecular weight of vinylpyrrolidone is 35,000; the mixture is heated in a water bath, and ultrasonic vibration is performed in an ultrasonic oscillator while the water bath is heating to realize the first physical dispersion. 18kHz; after the first physical dispersion, keep the water bath heating state and carry out magnetic stirring in the magnetic stirrer to realize the second physical dispersion. The water bath heating temperature for the second physical dispersion is 65°C, and the magnetic ...

Embodiment 2

[0026] Embodiment 2: a kind of method for modifying copper-based conductive contacts, comprising the following steps: adding graphene powder and hydrophilic surfactant to water to form a mixture, based on the total mass of the mixture, the mass percentage of graphene powder is 0.1%, the mass percentage of hydrophilic surfactant is 2%, the purity of graphene powder is ≥99.5%, the particle size of graphene powder is 0.5-5 μm, and the hydrophilic surfactant is polyvinylpyrrolidone, poly The molecular weight of vinylpyrrolidone is 45,000; the mixture is heated in a water bath, and ultrasonic oscillation is performed in an ultrasonic oscillator while the water bath is heating to realize the first physical dispersion. The water bath heating temperature for the first physical dispersion is 65°C, and the ultrasonic oscillation frequency After the first physical dispersion, keep the water bath heating state and carry out magnetic stirring in the magnetic stirrer to realize the second ph...

Embodiment 3

[0027] Embodiment 3: the mass percent composition of graphene powder is 0.2%, the mass percent composition of hydrophilic surfactant is 0.4%, the thickness that graphene slurry is coated on the electric contact surface of copper-based conductive contact 10 μm, other steps are the same as in Example 2.

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Abstract

The invention relates to the technical field of conductive contacts, and discloses a copper-based conductive contact modification method, comprising the following steps: adding graphene powder with a mass percentage of 0.1%-0.2% and a mass percentage of 0.2%-2 %Hydrophilic surfactant is added to water to form a mixture; the mixture is heated in a water bath and physically dispersed to obtain a suspension; the suspension is centrifuged; the graphene slurry is evenly coated on the electrical contact surface of the copper-based conductive contact Above, the copper-based conductive contacts are transferred to a vacuum drying oven for drying; the dried copper-based conductive contacts are calcined under the action of protective gas; Hot pressing is carried out, and the temperature of the pressing head in the hot pressing mold is 1050°C-1083°C; after cooling, a layer of dense graphene coating is formed on the electrical contact surface of the copper-based conductive contact. The surface hardness, surface contact resistance, thermal conductivity and arc erosion resistance of the modified copper-based conductive contact are greatly improved.

Description

technical field [0001] The invention relates to the technical field of conductive contacts, in particular to a copper-based conductive contact modification method. Background technique [0002] Contacts are the key components of switching devices such as relays, contactors and circuit breakers. They play the role of closing and breaking circuits and conducting current. properties and mechanical properties. The main reason that affects the life of the contact is the contact resistance and temperature resistance of the contact. When the contact resistance is too large, it is easy to make the contact (electrical contact surface) heat and the local temperature rises, thereby causing the contact to weld and cause The contact surfaces of the moving contact and the static contact are bonded together, which not only affects the reliability of the relay but also reduces the service life of the contact; when the moving contact and the static contact are separated, an arc will also be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08
CPCC23C24/082
Inventor 吴潇吴建中冯卫良杨云冯浩程文章程熊伟朱李俊杨娜邹威
Owner 江西大乘汽车有限公司
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