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A kind of flaky copper powder carrying nanometer copper crystals and preparation method thereof

A flake copper powder, nano copper technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of insufficient specific surface area, complicated process, long cycle, etc., and achieve easy availability of raw materials. , the effect of reducing costs and saving time and costs

Active Publication Date: 2019-04-09
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, those skilled in the art are committed to developing a flake copper powder carrying nano-copper crystals and its preparation method to solve the defects of high cost, complicated process, long cycle, and insufficient specific surface area in the above-mentioned prior art.

Method used

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  • A kind of flaky copper powder carrying nanometer copper crystals and preparation method thereof
  • A kind of flaky copper powder carrying nanometer copper crystals and preparation method thereof
  • A kind of flaky copper powder carrying nanometer copper crystals and preparation method thereof

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preparation example Construction

[0037] A preparation method of flake copper powder carrying nano-copper crystals provided by the present invention comprises the following steps:

[0038] Step 1, mixing copper powder and aluminum powder with a volume ratio of 1:1 to 1:5, adding a process control agent, and preparing interlayer copper-aluminum alloy composite powder by ball milling;

[0039] Step 2, passivating the copper-aluminum alloying composite powder in step 1 with air to obtain surface-oxidized copper-aluminum alloying composite powder;

[0040]Step 3. Dealloying the copper-aluminum alloying composite powder in step 2 with an acid solution to remove the aluminum metal in the copper-aluminum alloying composite powder to obtain dealloyed copper powder;

[0041] Step 4, washing and drying the dealloyed copper powder obtained in step 3 to obtain flaky copper powder carrying nano-copper crystals.

[0042] In a preferred embodiment of the present invention, in step 1, the volume ratio of copper powder to alu...

Embodiment 1

[0069] Step 1, get the copper that volume ratio is 3:7, aluminum element powder, gross weight is 50g (containing 21g aluminum powder and 29g copper powder), add the stearic acid that weight is 0.35g in mixed powder; Above-mentioned mixed powder Put into a stainless steel ball mill tank with a volume of 500mL, add 500g of stainless steel balls with a diameter of 16mm, cover the ball mill tank and tighten the bolts;

[0070] Step 2. Open the air port of the ball mill tank and put it into the transitional sealed chamber of the vacuum argon glove box, perform the operation of vacuuming and introducing argon gas, repeat three times, and then open the transitional sealed chamber in the glove box protected by the argon atmosphere , close and tighten the air port of the ball mill jar, take out the ball mill jar, put it into the planetary ball mill and fix it;

[0071] Step 3, set the speed of the ball mill to 200rpm, run for 4 hours, and mix the powder;

[0072] Step 4. After the pow...

Embodiment 2

[0085] Step 1, get the copper that volume ratio is 1:1, aluminum element powder, gross weight is 50g (containing 12g aluminum powder and 38g copper powder), add the stearic acid that weight is 0.35g in mixed powder; Above-mentioned mixed powder Put into a stainless steel ball mill tank with a volume of 500mL, add 500g of stainless steel balls with a diameter of 16mm, cover the ball mill tank and tighten the bolts;

[0086] Step 2. Open the air port of the ball mill tank and put it into the transitional sealed chamber of the vacuum argon glove box, perform the operation of vacuuming and introducing argon gas, repeat three times, and then open the transitional sealed chamber in the glove box protected by the argon atmosphere , close and tighten the air port of the ball mill jar, take out the ball mill jar, put it into the planetary ball mill and fix it;

[0087] Step 3, set the speed of the ball mill to 200rpm, run for 4 hours, and mix the powder;

[0088] Step 4. After the pow...

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Abstract

The invention discloses a flaky copper powder carrying nanometer copper crystals and a preparation method thereof. The thickness of the copper flakes in the flake copper powder is 100-500nm, and the surface of the copper flakes is uniformly attached with nano-level copper crystal particles; the preparation method includes the following steps: firstly, the copper powder and other metal powders are used to prepare a copper alloy composite powder between layers; Then the copper alloying composite powder is passivated and then subjected to dealloying treatment to remove other metals in the copper alloying composite powder; finally, the dealloyed powder is cleaned and dried to obtain flake copper powder carrying nano-copper crystals; the technical scheme of the present invention A new type of flaky copper powder structure is prepared, which has better electrical conductivity and catalytic properties; the preparation process shortens the ball milling time, simplifies the process flow, reduces the introduction of impurities, is simple and easy to operate, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a flaky copper powder carrying nanometer copper crystals and a preparation method thereof. Background technique [0002] The content of copper in the earth's crust is about 0.01%. It is one of the earliest metals used by human beings, and its use has a profound impact on the progress of early human civilization. Pure copper is a soft metal, its surface is reddish orange with metallic luster when it is just cut, and its single substance is purplish red. Copper has good ductility, high thermal conductivity and electrical conductivity, so it is the most commonly used material in cables, electrical and electronic components, and can also be used as a building material, and can be composed of many kinds of alloys. Copper alloys have excellent mechanical properties and low electrical resistivity, the most important of which are bronze and brass. Copper has weak mobility, is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/04B22F9/16B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/04B22F9/16B22F2999/00B22F2998/10B22F2009/043B22F1/0551B22F1/068B22F1/054B22F1/07B22F1/145B22F2201/11
Inventor 张德良李晨光张明威阮绵面梁加淼谢跃煌
Owner SHANGHAI JIAOTONG UNIV
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