Preparation method of porous copper powder

A technology of porous copper and copper powder, applied in the field of powder metallurgy, can solve the problems of complex equipment, high powder activity, high bulk density, and achieve the effect of environmental friendliness

Inactive Publication Date: 2008-12-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
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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 example Construction

[0016] figure 1 The preparation process of porous copper powder is described:

[0017] ①The soluble copper salt solution and the stoichiometric precipitant solution are added to the reactor through the feeding device in a certain feeding way, and the Cu 2+ -NH 3 -NH 4 + -SG n- -C 2 o 4 2- -H 2 O(SG n- Representative acid ion: SO 4 2- , Cl - , NO 3 - , CH 3 COO - ) system for liquid-phase coordination precipitation, the temperature is controlled at 30-80°C, the pH is adjusted to 3.0-8.5 with ammonia water, and the initial Cu in the feed solution 2+ The concentration is 0.1-1.0mol / L; the dispersant PVP (polyvinylpyrrolidone) is added (the weight percentage of the total solution weight is 0.1%-0.2%);

[0018] ② After the reaction is completed, the precipitate obtained is washed, filtered and dried to become the precursor of copper powder;

[0019] ③Place the precursor of copper powder in an electric furnace regulated by PID, control the temperature at 300-400°C...

Embodiment 1

[0022] 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.

[0023] 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

[0025] 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.

[0026] 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 ...

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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 of purposes.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and relates to a preparation method of porous copper powder. Background technique [0002] 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 size, poor...

Claims

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Application Information

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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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