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Production process of conductive flaky copper powder

A flake copper powder, production process technology, applied in metal processing equipment, dispersed particle filtration, coating and other directions, can solve the problems of reduced conductivity, inability to meet the high conductivity of special conductive materials, etc., to achieve high coverage, The effect of excellent electrical conductivity

Pending Publication Date: 2019-09-27
铜陵国传电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The flaky copper powder particles are washed and dispersed to form a copper powder dispersion, and silver nitrate is coated to form a crystal nucleus. The coating rate of silver to copper powder is high, the silver content reaches 50-75%, and the resistivity reaches 2.5-3.5×10 -6 Ω·m, excellent conductivity, which solves the problem that the conductivity of copper powder decreases significantly at high temperature and cannot meet the high conductivity requirements of special conductive materials;

Method used

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  • Production process of conductive flaky copper powder
  • Production process of conductive flaky copper powder
  • Production process of conductive flaky copper powder

Examples

Experimental program
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Embodiment 1

[0042] refer to Figure 1-6 As shown, the present embodiment provides a production process of conductive flake copper powder, which specifically includes the following steps:

[0043] S1. Smelting: put the copper material into an intermediate frequency induction furnace, and smelt it at a power of 80KW and a temperature of 1105°C;

[0044] S2. Atomization: Add cooling medium into the atomization chamber 2, turn on the water level sensor 19, add cooling medium until the liquid level is about 1.1 meters away from the bottom of the nozzle; fill nitrogen gas from the air inlet 20, and the nitrogen gas enters the cooling along the air inlet pipe 21 In the medium, oxidizing gases such as oxygen in the cooling medium are discharged, and the exhaust port 22 is connected to a vacuum pump, and the vacuum pump discharges oxidizing gases such as oxygen from the exhaust port 22;

[0045] Close the air inlet 20 and the air outlet 22, turn on the servo motor 4, the servo motor 4 drives the ...

Embodiment 2

[0058] This embodiment provides a production process of conductive flake copper powder. The difference from Embodiment 1 is that the smelting temperature in step S1 is 1120° C.; the step S4 is dried at a temperature of 145° C. for 6 hours; the step S6 is based on parts by weight. - 2 parts of flaky copper powder particles are added to 10 to 20 parts of acetone for washing, centrifugally filtered and dispersed in 12 parts of ethanol to obtain a copper powder dispersion; step S7 is based on parts by weight, adding 150 parts by weight to the copper powder dispersion. 1 part of deionized water and 7 parts of polyvinylpyrrolidone were mixed uniformly to obtain mixed solution a; 4 parts of solid silver nitrate were dissolved in 115 parts of deionized water, and 1.4 parts of 48wt% citric acid solution was added, and mixed uniformly to obtain mixed solution b; Under the condition of water bath, add the mixed solution b to the mixed solution a, and continue to stir for 42 minutes after ...

Embodiment 3

[0061] This embodiment provides a production process for conductive flake copper powder. The difference from Embodiment 1 is that the melting temperature in step S1 is 1115° C.; the step S4 is dried at a temperature of 165° C. for 4 hours; and the step S6 is based on parts by weight. Parts of flaky copper powder particles are added to 20 parts of acetone for washing, centrifugally filtered and dispersed in 20 parts of ethanol to obtain a copper powder dispersion; Step S7 adds 170 parts of deionized water to the copper powder dispersion according to parts by weight , 8 parts of polyvinylpyrrolidone, mix uniformly to obtain mixed solution a; get 4 parts of solid silver nitrate and dissolve in 115 parts of deionized water, add 1.5 parts of 50wt% citric acid solution, mix uniformly to obtain mixed solution b; under ice-water bath conditions, Add the mixed solution b to the mixed solution a, and continue to stir for 50 minutes after the dropwise addition; Step S8 washes with deioniz...

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Abstract

The invention discloses a production process of conductive flaky copper powder, and relates to the technical field of functional materials. The process comprises eight steps of smelting, atomizing, suction filtering, vacuum drying, stirring and grinding, washing and dispersing, silver coating and washing and drying. During atomization, a high-pressure atomizing mechanism and an atomizing shell are fastened through a first screw rod, and a package leakage crucible and a high-pressure atomizing structure are fastened through a second screw rod, so that molten liquid in more stable in the pouring and atomizing process; and the copper powder crushed by high-pressure water columns jet by multiple nozzle pipes is more even and finer. According to the production process, flaky copper powder particles are washed and dispersed to form copper powder dispersion liquid, the copper powder dispersion liquid is covered with silver nitrate to form crystal nucleuses, the silver-coated copper powder coating rate is high, and the silver content reaches 50% to 75%; and the electrical resistivity reaches 2.5-3.5*10<-6> Omega.m, and the conductive performance is excellent.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a production process of conductive flake copper powder. Background technique [0002] In terms of electrical conductivity, the contact between spherical metal particles is point contact, and the electrical conductivity is poor. The amount of metal powder used in production is large, and the cost of use is high. The flake metal powder particles not only have a large specific surface area, but also the contact between the particles is line contact and surface contact, which greatly increases the contact area between the flake metal powder particles, and the amount of metal powder required to form a conductive channel with the same conductivity It is obviously reduced, and the viscous product prepared with flake metal powder also has thixotropic properties, and the sedimentation stability of the product is significantly improved. Therefore, the conductive electronic ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/02B22F1/00B01D46/02
CPCB22F9/082B01D46/02B22F2009/0848B22F1/068B22F1/14B22F1/17
Inventor 汤传舵汤传毛
Owner 铜陵国传电子材料科技有限公司
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