Preparation method of nickel coated copper composite powder

A technology of nickel-coated copper and composite powder, which is applied in the field of metallurgy, can solve the problems of high production cost, difficulty in industrial production application, complex process, etc., and achieve the effect of low production cost, simple production process and easy operation

Active Publication Date: 2013-04-03
NAT ENG RES CENT FOR SPECIAL METAL MATERIALS OF TANTALUM & NIOBIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the problems of complex process, high p...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add the mixed aqueous solution containing 1.0mol / L copper sulfate and 130g / L absolute ethanol at 40°C into the stirred reactor containing the mixed aqueous solution of 0.75mol / L ammonium oxalate and 80g / L absolute ethanol at 40°C, and stir evenly , 20 minutes after the reaction was completed, copper oxalate was precipitated after the reaction was complete.

[0023] Filter the copper oxalate and wash it with pure water until neutral, prepare a copper oxalate solution at a concentration of 10g / L and adjust the temperature to 40°C.

[0024] Next, nickel sulfate was weighed with a copper-nickel weight ratio of 2:1, dissolved in pure water to make a 40°C, 2mol / l nickel sulfate solution, and a 40°C, 1.0mol / L ammonium oxalate aqueous solution according to stoichiometric Add it into the reaction container at a constant speed, react for 30 minutes after the addition, and then wash it twice with pure water repeatedly, filter it with absolute ethanol, and dry it in an electric ove...

Embodiment 2

[0027] Add the mixed aqueous solution containing 1.75mol / L copper sulfate and 100g / L absolute ethanol at 45°C into the stirred reactor containing the mixed aqueous solution of 0.75mol / L ammonium oxalate and 100g / L absolute ethanol at 45°C, and stir at a constant speed , After adding and reacting for 25 minutes, copper oxalate was precipitated.

[0028] Filter the copper oxalate and wash it with pure water until neutral, prepare a copper oxalate solution at a concentration of 25g / L and adjust the temperature to 45°C.

[0029] Next, nickel sulfate was weighed with copper-nickel weight ratio of 1:1, dissolved in pure water to make 45°C, 1.5mol / l nickel sulfate solution and 45°C, 1.5mol / L sodium carbonate aqueous solution according to stoichiometric Add it into the reaction container at a constant speed, react for 25 minutes after the addition, and then wash it repeatedly with pure water twice, filter it with absolute ethanol, and dry it in an electric oven at 120°C to obtain copp...

Embodiment 3

[0032] Add the mixed aqueous solution containing 2mol / L copper nitrate and 90g / L PVP at 38°C into the stirred reactor containing the mixed aqueous solution of 1.25mol / L ammonium oxalate and 50g / L PVP at 38°C, stir at a constant speed, and react 30 Minutes later, copper oxalate was precipitated.

[0033] Filter the copper oxalate and wash it with pure water until neutral, prepare a copper oxalate solution at a concentration of 30g / L and adjust the temperature to 38°C.

[0034] Next, nickel sulfate was weighed with copper-nickel weight ratio of 1:1.5, dissolved in pure water to make 38°C, 2mol / l nickel sulfate solution and 38°C, 1.0mol / L ammonium carbonate aqueous solution according to the stoichiometric ratio Add it into the reaction vessel at a constant speed, react for 30 minutes after the addition, and then wash it twice with pure water repeatedly, filter it with absolute ethanol, and dry it in an electric oven at 120°C to obtain copper oxalate wrapped with nickel carbonate....

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Abstract

The invention relates to a preparation method of nickel coated copper composite powder. The preparation method comprises the following process steps that copper salt and oxalate or carbonate take reaction to generate cupric oxalate or copper carbonate sediments, the filtering is carried out, pure water is used for flushing to be in a neutral state, and solution with the concentration being 10 to 80g/L is prepared; and nickel salt solution and the required oxalate or carbonate solution are prepared according to a proportion that the copper nickel weight ratio is 2:1 to 1:2 and are added into the cupric oxalate or copper carbonate solution for reaction to generate nickel coated copper resultants. The preparation method has the advantages that firstly, nickel salts are used for coating copper salts, then, the thermal decomposition is carried out, nickel coated copper powder is obtained, the production process is simple, the operation is easy, the production cost is low, and the industrial production can be realized. The nickel coated copper powder or alloy prepared by the method has the morphology in a spherical shape, a near-spherical shape, an irregular shape or a tree branch shape, and has the advantages that the powder dispersion is uniform, no segregation is generated, the coating effect is good, the coating is compact, the particle size is controllable, and the like. The nickel coated copper powder or alloy can be used for electromagnetic shielding materials and powder metallurgy prealloyed powder. The preparation method can be used for preparing nickel-copper alloy powder.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of nickel-coated copper composite powder applicable to electromagnetic shielding materials and powder metallurgy pre-alloyed powders. Background technique [0002] Electromagnetic shielding coatings are the most popular because they can be coated on complex shapes, low cost, simple and practical, and widely applicable, accounting for more than 75% of the market share of shielding materials. It can effectively solve the electromagnetic wave interference and shielding problems of electronic products. In addition, in modern electronic warfare, warships, and nuclear submarines, in order to prevent external electromagnetic interference and prevent its own electromagnetic waves from radiating outward, effective shielding measures are also required. At present, the raw materials used in electromagnetic shielding coatings are generally pure silver pow...

Claims

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Application Information

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IPC IPC(8): B22F9/16
Inventor 李军义王东新孙本双郭顺孙磊李彬
Owner NAT ENG RES CENT FOR SPECIAL METAL MATERIALS OF TANTALUM & NIOBIUM
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