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A kind of preparation method of nickel-coated copper composite powder

A technology for nickel-coated copper and composite powder, applied in the field of metallurgy, can solve the problems of complex process, high production cost and difficult industrialized production application, etc., and achieves the effects of simple production process, low production cost and dense coating.

Active Publication Date: 2016-04-20
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 production cost and difficult industrial production application

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 / LPVP at 38°C to the stirred reactor containing the mixed aqueous solution of 1.25mol / L ammonium oxalate and 50g / LPVP at 38°C, stir at a constant speed, and react for 30 minutes after the addition , and 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...

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PUM

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Abstract

The invention relates to a preparation method of nickel-coated copper composite powder. The process steps include: reacting copper salt with oxalate or carbonate to form copper oxalate or copper carbonate precipitation, filtering, washing with pure water until neutral , to prepare a solution with a concentration of 10-80g / L; prepare a nickel salt solution and the required oxalate or carbonate solution according to the copper-nickel weight ratio of 2:1-1:2, and then add it to the above-mentioned copper oxalate Or react in copper carbonate solution to generate nickel-coated copper product. In the present invention, nickel salt is first used to coat copper salt, and then thermally decomposed to obtain nickel-coated copper powder. The production process is simple, easy to operate, low in production cost, and can realize industrial production. The appearance of the nickel-clad copper powder or alloy prepared by the present invention is spherical, spherical, irregular and dendritic, and has the advantages of uniform powder dispersion, no segregation, good coating effect, dense coating, controllable particle size, etc., and can be applied Used in electromagnetic shielding materials and powder metallurgy pre-alloyed powders. It can also be used to prepare 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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Patent Type & Authority Patents(China)
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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