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Two-dimensional lamellar phase enhanced silver-based electric contact material and preparation method thereof

A technology of electrical contact materials and two-dimensional sheets, applied in contacts, circuits, electrical switches, etc., can solve problems such as high toxicity, burning loss, and inability to transmit heat to electrical contacts in time, achieving small changes in resistivity, The effect of improving thermal conductivity

Pending Publication Date: 2020-12-29
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the interface bonding effect between graphene and metal powder has been improved to some extent, due to the problem of poor wetting between graphene and metal precipitation layer, the thermal conductivity of the obtained composite electrical contact material is still insufficient, resulting in the inability of the electrical contact to heat. Passed in time, a larger burning loss occurs in a smaller number of breaking times in the fast switching test
And because hydrazine hydrate is used in the precipitation process, the toxicity of this substance is relatively large, which is unfavorable for industrialized production

Method used

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  • Two-dimensional lamellar phase enhanced silver-based electric contact material and preparation method thereof
  • Two-dimensional lamellar phase enhanced silver-based electric contact material and preparation method thereof
  • Two-dimensional lamellar phase enhanced silver-based electric contact material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Graphite oxide was prepared by the Hummers method using flake graphite as raw material, and then a well-dispersed 0.5 mg / mL graphene oxide solution was obtained after ultrasonication for 10 h.

[0035] (2) Take 3.3974g of silver nitrate and add 9.31mL of graphene oxide solution, then add deionized water to 100mL, mix with low-temperature ultrasonic and mechanically stir for 30min to complete the electrostatic adsorption self-assembly.

[0036] (3) Take 0.88g of sodium hydroxide and add 100mL of water, stir evenly, drop into the above mixed salt solution, the dropping speed is 3mL / min, and the whole process is supplemented by 800r / min mechanical stirring.

[0037] (4) After three times of washing and suction filtration, the precipitate was dried in vacuum at 50°C for 12 hours. The composite material powder was ground, pressed at 550MPa for 90s, and then placed in a vacuum furnace for sintering. The sintering parameters were kept at 750°C for 3 hours to obtain silver. ...

Embodiment 2

[0039] (1) Graphite oxide was prepared by the Hummers method using flake graphite as raw material, and then a well-dispersed 5 mg / mL graphene oxide solution was obtained after ultrasonication for 10 h.

[0040] (2) Take 3.3974g of silver nitrate and add 37.52mL of graphene oxide solution, then add deionized water to 100mL, mix with low-temperature ultrasonic and mechanically stir for 30min to complete electrostatic adsorption self-assembly.

[0041] (3) Take 0.88g of sodium hydroxide and add 100mL of water, stir evenly, drop into the above mixed salt solution, the dropping speed is 4mL / min, and the whole process is supplemented by 750r / min mechanical stirring.

[0042] (4) The precipitate was washed and filtered three times, then vacuum-dried at 50°C for 12 hours, the composite material powder was ground, pressed at 550MPa for 90s, and then placed in a nitrogen atmosphere for sintering. The sintering parameters were kept at 850°C for 3 hours to obtain silver base electrical co...

Embodiment 3

[0044] (1) Graphite oxide was prepared by the Hummers method using flake graphite as raw material, and then a well-dispersed 5 mg / mL graphene oxide solution was obtained after ultrasonication for 10 h.

[0045] (2) Take 1.6987g of silver nitrate and add 6.62mL of graphene oxide solution, then add deionized water to 100mL, mix with low-temperature ultrasonic and mechanically stir for 30min to complete the electrostatic adsorption self-assembly.

[0046](3) Take 0.44g of sodium hydroxide and add 100mL of water, stir evenly, drop into the above mixed salt solution, the dropping speed is 3mL / min, and the whole process is supplemented by 750r / min mechanical stirring.

[0047] (4) The sediment was washed and filtered three times, then dried in vacuum at 50°C for 12 hours, the composite material powder was ground, pressed at 550MPa for 90s, and then placed in a vacuum furnace for sintering at 750°C for 3 hours to obtain silver-based electrical contact material.

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Abstract

The invention discloses a two-dimensional lamellar phase enhanced silver-based electric contact material and a preparation method thereof, and relates to the technical field of metal-based composite materials. The two-dimensional lamellar phase enhanced silver-based electric contact material adopts a two-dimensional lamellar layer rich in functional groups on the surface as a reinforcing phase, and silver ions coat a matrix in an electrostatic adsorption self-assembly and precipitation manner due to the polarity of the functional groups on the surface, so that the matrix and the reinforcing phase are mixed at a molecular level, and the interface two-phase wetting effect is better. Compared with metal silver, the hardness of the silver-based electric contact material obtained through the method is improved, and meanwhile the resistivity change is small.

Description

Technical field: [0001] The invention relates to the technical field of metal-based composite materials, in particular to a silver-based electrical contact material reinforced by a two-dimensional sheet phase and a preparation method thereof. Background technique: [0002] According to relevant statistics, the global market for electrical contact materials reached US$3.63 billion in 2017, and is expected to reach US$5.938 billion in 2025, with a compound annual growth rate (CAGR) of 6.34%. That is, electrical contact materials have great market demand and bright future. the future of. The working environment of electrical contact materials determines that it should have good electrical and thermal conductivity, good processing performance and certain strength. Metal silver has excellent electrical and thermal conductivity, processability, and oxidation resistance, and is widely used in the preparation of Various electrical contact materials, such as relays, contactors, load...

Claims

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Application Information

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IPC IPC(8): H01H1/0233H01H1/0237H01H11/04
CPCH01H1/0233H01H1/0237H01H11/048
Inventor 王顺蒋学鑫王韶晖
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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