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Preparation method of porous copper powder

A technology of porous copper and copper powder, which is applied in the field of powder metallurgy to achieve an environmentally friendly effect

Inactive Publication Date: 2011-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas-phase steam method has complex equipment and high cost
Gamma ray method products are difficult to collect
The energy utilization rate of the plasma method is low
The product prepared by water atomization method has large particle size, poor formability and high bulk density
The electrolysis method consumes a lot of electric energy, the powder is highly active, requires reduction treatment, and the cost is high
Although the liquid-phase chemical reduction method has simple equipment and is easy to produce industrially, the reducing agents currently used are either highly toxic or cost too much

Method used

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  • Preparation method of porous copper powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The dispersant PVP of copper sulfate solution, oxalic acid solution and 0.1%wt (percentage by weight) is added to the reactor through the feeding device, in Cu 2+ -NH 3 -NH 4 + -SO 4 2- -C 2 o 4 2- -H 2 Coordination precipitation transformation is carried out in the O system, the temperature is controlled at 50 °C, the pH is adjusted to 3.5 with ammonia water, and the initial Cu in the feed solution 2+ Concentration is 0.1mol / L, C 2 o 4 2- The concentration is 0.11mol / L.

[0027] After the reaction is completed, the obtained precipitate is washed, filtered and dried to become the copper powder precursor. After that, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at 310 ° C and heated in N 2 The thermal decomposition is carried out under the control of the atmosphere. After the thermal decomposition is completed, cool to room temperature, and the deep red powder taken out from the burnin...

Embodiment 2

[0029] The copper chloride solution, the ammonium oxalate solution and the dispersant PVP of 0.2%wt are added to the reactor through the feeding device, and the Cu 2+ -NH 3 -NH 4 + -Cl - -C 2 o 4 2- -H 2 Coordination precipitation transformation is carried out in the O system, the temperature is controlled at 70 °C, the pH is adjusted to 6.5 with ammonia water, and the initial Cu in the feed solution 2+ Concentration is 0.4mol / L, C 2 o 4 2- The concentration is 0.44mol / L.

[0030] After the reaction is completed, the obtained precipitate is washed, filtered and dried to become the copper powder precursor. Afterwards, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at 350 ° C, and in (H 2 +N 2 ) under the control of the atmosphere for thermal decomposition. After the thermal decomposition is completed, cool to room temperature, and the deep red powder taken out from the burning boat after being ...

Embodiment 3

[0032] Add copper nitrate solution, sodium oxalate solution and 0.1%wt dispersant PVP to the reactor through the feeding device, in Cu 2+ -NH 3 -NH 4 + -NO 3 - -C 2 o 4 2- -H 2 The coordination precipitation transformation was carried out in the O system, the temperature was controlled at 30°C, the pH was adjusted to 8.0 with ammonia water, and the initial Cu in the feed solution 2+ Concentration is 0.8mol / L, C 2 o 4 2- The concentration is 0.88mol / L.

[0033]After the reaction is completed, the obtained precipitate is washed, filtered and dried to become the copper powder precursor. Afterwards, the precursor is put into a burning boat and placed in a PID-regulated electric furnace. The temperature is controlled at 380 ° C, and in (H 2 +N 2 ) under the control of the atmosphere for thermal decomposition. After the thermal decomposition is completed, cool to room temperature, and the deep red powder taken out from the burning boat after being out of the furnace is...

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Abstract

The invention relates to a preparation method of porous copper powder; the preparation method is characterized in that: by adopting a coordination precipitation-thermal decomposition method, a copper powder precursor precipitate is synthesized in a Cu<2+>-NH3-NH4<+>-SG<n->-C2O4<2->-H2O system at the normal temperature and pressure, wherein the SG<n-> stands for acid ions, namely SO4<2->, CL<->, NO3<-> and CH3COO<->, the precursor is thermally decomposed under a non-oxidizing atmosphere to obtain the porous copper powder. The overall preparation process is safe and reliable, non-toxic and pollution free; the copper powder produced by using the preparation method of the invention is porous, has small particle size, large specific surface area, and can meet the requirements of a plurality ofpurposes.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to a preparation method of porous copper powder. [0002] Background technique [0003] Copper powder is widely used in powder metallurgy, catalysts, lubricants, conductive coatings and electromagnetic shielding materials due to its high surface activity and good electrical and thermal conductivity. At present, the methods for preparing copper powder mainly include gas-phase steam method, γ-ray method, plasma method, water atomization method, electrolysis method and liquid-phase chemical reduction method. These methods each have their own advantages, but at the same time there are many shortcomings, especially difficult to prepare porous copper powder. The gas-phase steam method has complex equipment and high cost. Gamma ray products are difficult to collect. The energy efficiency of the plasma method is low. The product prepared by the water atomization method has large particle s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 张传福樊友奇邬建辉湛菁黎昌俊戴曦
Owner CENT SOUTH UNIV
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