A kind of preparation method of core-shell structure silver-coated copper nanopowder material

A core-shell structure, nano-powder technology, applied in nanotechnology, transportation and packaging, metal processing equipment, etc., can solve the problems of cumbersome process, time-consuming, unfavorable for mass production, etc., to achieve simple process, no pollution to the environment, The effect of improving oxidation resistance and thermal stability

Active Publication Date: 2017-04-05
山东嘉途门窗有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome and requires not only pickling the oxide layer on the surface of the copper powder, but also ball milling and other processes, and it takes a long time, which is not conducive to mass production

Method used

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  • A kind of preparation method of core-shell structure silver-coated copper nanopowder material
  • A kind of preparation method of core-shell structure silver-coated copper nanopowder material
  • A kind of preparation method of core-shell structure silver-coated copper nanopowder material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Will figure 1 The upper cover 1 of the shown device is opened, and the block made of uniformly mixed 16g copper powder and 4g silver powder is used as the anode material of the plasma arc furnace, and placed in the device schematically. figure 1 In the graphite crucible 9; Tungsten metal is used as the cathode material, and a distance of 30 mm is maintained between the tungsten electrode and the anode. Cover the upper cover 1 of the device, pass the cooling water a first, and vacuumize the working room through the valve 3, and then pass the argon gas b successively; then connect the DC power supply 10, the working current is 100A, adjust the working current and The voltage remains relatively stable, turn off the power after 0.5h, pump out the working gas, inject argon for passivation, passivation time is 2h, open the upper cover to collect the nano powder on the side wall of the plasma arc furnace and the upper cover, and obtain a core-shell The particle size of the st...

Embodiment 2

[0026] Will figure 1 The upper cover 1 of the shown device is opened, and the block made of uniformly mixed 17g copper powder and 3g silver powder is used as the anode material of the plasma arc furnace, and placed in the device schematically. figure 1 In the graphite crucible 9; graphite is used as the cathode material, and a distance of 30 mm is maintained between the graphite electrode and the anode. Cover the upper cover 1 of the device, first pass the cooling water a, and vacuumize the working chamber through the valve 3, and then pass in the argon gas b and hydrogen gas c successively, and the volume ratio of argon gas is 70%; then connect the DC power supply 10, The working current is 60A. During the arc discharge process, the working current and voltage are adjusted to keep relatively stable. After 1h, the power is turned off, the working gas is pumped out, and argon gas is injected for passivation. The passivation time is 2h. The upper cover is opened to collect the p...

Embodiment 3

[0028] Will figure 1 The upper cover 1 of the shown device is opened, and the block made of uniformly mixed 18g copper powder and 2g silver powder is used as the anode material of the plasma arc furnace, and placed in the device schematically. figure 1 In the graphite crucible 9; Tungsten metal is used as the cathode material, and a distance of 30 mm is maintained between the tungsten electrode and the anode. Cover the upper cover 1 of the device, first pass the cooling water a, and vacuumize the working chamber through the valve 3, and then pass in argon b and hydrogen c successively, and the volume ratio of argon gas is 50%; then connect the DC power supply 10, The working current is 80A. During the arc discharge process, the working current and voltage are adjusted to keep relatively stable. After 0.5h, the power is turned off, the working gas is drawn out, and argon gas is injected for passivation. The passivation time is 3h. The upper cover is opened to collect the plasma...

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Abstract

The invention discloses a preparation method of a core-shell structure silver-clad copper nano-powder material, belonging to the field of bimetallic core-shell structure materials. The method is to mix different proportions of metal copper powder and silver powder evenly and then press them into a block. As the anode material of the plasma arc furnace, tungsten metal or graphite is used as the cathode material, and argon and hydrogen are used as the working gas. Next, an arc is started between the anode and the cathode, and passivation is performed after a period of time to obtain silver-coated copper nanopowders with a core-shell structure. The preparation method provided by the invention has simple process, short process, easy control, is suitable for large-scale industrial production, has no pollution to the environment, and is green and environment-friendly.

Description

technical field [0001] The invention belongs to the field of nano bimetallic core-shell structure materials, and in particular relates to a preparation method of silver-coated copper nanopowder with a core-shell structure. Background technique [0002] Silver is the metal with the best conductivity, and it also has the advantages of good oxidation resistance and stable performance, so it can be used as a conductive filler and can be made into a conductive paste and is widely used in electronic components. However, its price is relatively expensive, and it has the disadvantage of easy migration, which makes it difficult to carry out large-scale industrial application in industry. The conductivity of copper is second only to silver, and the cost is low, but copper is easy to oxidize to form insulating oxides, resulting in a significant drop in conductivity, which is difficult to meet the requirements of the high-end electronics industry. Evenly plating a layer of silver on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/12B22F9/14B82Y40/00
CPCB22F9/12B22F9/14B22F2998/10B22F1/054B22F1/17B22F1/145
Inventor 丁梦玲冒爱琴俞海云丁赔赔郑翠红
Owner 山东嘉途门窗有限责任公司
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