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Preparation method of oxide or meta-coated nickel ultrafine powder

A technology of metal coating and ultrafine powder, which is applied in the direction of coating, etc., can solve the problems of high surface energy, easy agglomeration, easy oxidation, etc., and achieve the effect of simple preparation process, high oxidation resistance and high crystallinity

Active Publication Date: 2012-10-17
NAT ENG RES CENT FOR SPECIAL METAL MATERIALS OF TANTALUM & NIOBIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to certain defects in this production method and the inherent characteristics of the ultrafine nickel powder itself, its performance cannot be fully exerted, and many advantages of the ultrafine powder are lost, which limits its wider application range.
First of all, the surface of metal ultrafine nickel powder is strongly polar, and cannot be combined with organic media during use. Therefore, it is necessary to treat the surface to make its surface non-polar, so that it can be well combined with organic media. together; secondly, the ultrafine nickel powder has a large specific surface area, high surface energy, and the particles are in a non-thermodynamic stable state, which is easy to agglomerate, and the ultrafine powder with poor dispersion is very difficult in the actual use process; finally, the ultrafine nickel powder Metal nickel powder has a huge surface area, which makes its surface atom coordination insufficient, dangling bonds increase, and surface energy high, making it easy to oxidize in the air

Method used

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  • Preparation method of oxide or meta-coated nickel ultrafine powder
  • Preparation method of oxide or meta-coated nickel ultrafine powder
  • Preparation method of oxide or meta-coated nickel ultrafine powder

Examples

Experimental program
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Effect test

Embodiment 1

[0034] First weigh 5 moles of nickel sulfate hexahydrate and dissolve it in 5L deionized water to make a 1mol / L solution, add 1.2L of absolute ethanol, stir to mix evenly, then weigh 5 moles of ammonium oxalate and dissolve it in Prepare 0.25 mol / L solution in 20 L of deionized water, add 4 L of absolute ethanol, stir to mix evenly, and adjust its pH value to 6 with hydrochloric acid (37.5 wt % concentrated hydrochloric acid). The ammonium oxalate solution was added to the nickel sulfate aqueous solution at a rate of 0.5 L / min, stirred at a rate of 300 rpm for 30 minutes, and the reaction temperature was 25° C. to obtain a single precursor solution.

[0035] Then, weigh 5 moles of magnesium chloride and dissolve it in 5L deionized water to prepare a 1mol / L solution, then weigh 5 moles of ammonium oxalate and dissolve it in 5L deionized water to prepare a 1mol / L solution. / L magnesium chloride solution and 1mol / L ammonium oxalate solution were simultaneously added to a single p...

Embodiment 2

[0039] First weigh 7.5 moles of nickel sulfate hexahydrate and dissolve it in 5L deionized water to form a 1.5mol / L solution, add 1.2L of absolute ethanol, stir to mix evenly, then weigh 7.5 moles of ammonium oxalate and dissolve In 20L of deionized water, prepare a solution of 0.375mol / L, add 4L of absolute ethanol, stir to mix evenly, adjust the pH to 6 with hydrochloric acid, add the ammonium oxalate solution to nickel sulfate at a rate of 0.5L / min The solution was stirred at a speed of 300 rpm for 30 minutes, and the reaction temperature was 25° C. to prepare a single precursor solution.

[0040] Then, weigh 7.5 moles of magnesium chloride and dissolve it in 7.5L deionized water to prepare a 1mol / L solution, then weigh 7.5 moles of ammonium oxalate and dissolve it in 7.5L deionized water to prepare a 1mol / L solution. 1mol / L nickel sulfate solution and 1mol / L ammonium oxalate solution were simultaneously added to a single precursor solution at a speed of 0.5L / min, and stirr...

Embodiment 3

[0043] First weigh 5 moles of nickel sulfate hexahydrate and dissolve it in 5L deionized water to make a 1mol / L solution, add 1.2L of absolute ethanol, stir to mix evenly, then weigh 5 moles of ammonium oxalate and dissolve it in Prepare a 0.25mol / L solution in 20L of deionized water, add 4L of absolute ethanol, stir to mix evenly, adjust the pH value to 6 with hydrochloric acid, add the ammonium oxalate solution to nickel sulfate at a rate of 0.5L / min The solution was stirred at a speed of 300 rpm for 30 minutes at a reaction temperature of 25° C. to prepare a single precursor solution.

[0044] Then, weigh 2.5 moles of magnesium chloride and be dissolved in 5L deionized water to prepare a 0.5mol / L solution, then weigh 2.5 moles of ammonium oxalate and dissolve in 5L deionized water to prepare a 0.5mol / L solution. The nickel sulfate solution and the ammonium oxalate solution were simultaneously added to a single precursor solution at a speed of 0.5 L / min, and stirred at a spe...

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Abstract

The invention relates to a preparation method of oxide or meta-coated nickel ultrafine powder. The preparation method is characterized by comprising the following steps of: (1) respectively adding water-soluble nickel salt and precipitator into deionized water, so that two solutions can be obtained; (2) respectively adding dispersing agent into the two solutions; (3) mixing the two solutions; (4) respectively adding another water-soluble metal salt and precipitator into deionized water, so that two solutions can be obtained; (5) simultaneously adding the obtained two solutions into single-precursor solution; (6) carrying out solid-liquid separation, and drying, so that a salt-coated precursor can be prepared; and (7) heating to 500-1200DEG C, keeping the temperature for 0.5-5h, cooling along with a boiler, and cooling to the room temperature, so that the coated power can be obtained. The ultrafine coated power prepared by the method is approximately spherical in appearance, has the average grain diameters of 200-500nm, and is high in crystallinity; and the prepared spherical power is free of glomeration, good in dispersity, and high in oxidation resistance.

Description

technical field [0001] The invention relates to a preparation method of oxide or metal-coated nickel ultrafine powder. Background technique [0002] Functional powder materials are one of the important application forms of non-ferrous metals, such as gold, silver, platinum group, copper, nickel powder for the preparation of electronic paste and conductive adhesive; nickel and cobalt oxides are used for nickel hydrogen, lithium ion, Electrode materials for solid oxide fuel cells. The preparation of metal powder materials has become an important direction for the extension of the non-ferrous metal industry chain and the value-added product deep processing, and is an important basis for the development of high-tech. [0003] With the further development of the modern functional powder material industry, the requirements for powder products in various industries such as conductive paste, catalyst, and magnetic materials are getting higher and higher. Not only the purity of the ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02
Inventor 郭顺鲁东李军义陈学清施文锋王东新孙本双李彬张丽
Owner NAT ENG RES CENT FOR SPECIAL METAL MATERIALS OF TANTALUM & NIOBIUM
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