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Preparation method of superfine nickel-cobalt alloy powder

A nickel-cobalt alloy and nickel-cobalt technology, applied in the field of preparation of ultra-fine nickel-cobalt alloy powder, can solve the problems of incomplete cleaning of anions, high operation requirements, and high impurity content, and achieve low cost, short process flow, and low content Effect

Pending Publication Date: 2017-08-25
张成亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent No. 200810135036.5 uses the method of high-pressure hydrogen reduction to prepare ultra-fine nickel-cobalt alloy powder. The particle size is uniform and the product quality is good, but there are disadvantages such as complicated equipment and high requirements for operation.
The patent number is 200810028925.1. Nano-nickel-cobalt alloy powder is prepared by gel method-hydrogen reduction. It has excellent performance as an electromagnetic wave absorber, but because the precursor is prepared by gel method, the anions cannot be completely cleaned, and there are high impurities in it for other purposes. Shortcomings

Method used

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  • Preparation method of superfine nickel-cobalt alloy powder
  • Preparation method of superfine nickel-cobalt alloy powder
  • Preparation method of superfine nickel-cobalt alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Dissolve nickel-nickel-cobalt hexahydrate crystals in pure water at a ratio of 7:3, the dissolution temperature is 60°C, the total concentration is 1.5mol / l, and polyethylene glycol dispersant is added. The concentration of the dispersant is 0.02mol / l, while adding urea, the concentration of urea is 4 times of the total molar concentration of nickel-cobalt salt.

[0034] (2) Pour the mixed solution into the reaction kettle, stir and heat up by steam, the stirring speed is 200r / min, and the heating rate is 1°C / min, stop heating when the temperature reaches 90°C, and keep stirring at this temperature for 7 hours.

[0035] (3) Take out the reactant and wash it with pure water until the conductivity of the washing water = 80 us / cm, then dry it until the moisture content = 0.6%. Then the material is passed through a 200-mesh sieve, and the undersize is taken.

[0036] (4) Put the sieved material into the reduction furnace and pass it into a hydrogen-nitrogen mixture for...

Embodiment 2

[0040] (1) Dissolve the crystal of cobalt nickel cobalt chloride hexahydrate in pure water at a ratio of 6:4, the dissolution temperature is 50°C, the total concentration is 2mol / l, and polyethylene glycol dispersant is added, and the concentration of the dispersant is 0.03 mol / l, while adding urea, the concentration of urea is 4 times of the total molar concentration of nickel-cobalt salt.

[0041](2) Pour the mixed solution into the reaction kettle, stir and heat up in a water bath, the stirring speed is 200r / min, and the heating rate is 1.5°C / min, stop heating when the temperature reaches 95°C, and keep stirring at this temperature for 6 hours.

[0042] (3) Take out the reactant and wash it with pure water until the conductivity of the washing water is 90 us / cm, then dry it until the water content is 0.5%. Then the material is passed through a 200-mesh sieve, and the undersize is taken.

[0043] (4) Put the sieved material into the reduction furnace and pass in the mixed g...

Embodiment 3

[0047] (1) Dissolve nickel-nickel-cobalt sulfate heptahydrate crystals in pure water at a ratio of 5:5, the dissolution temperature is 40°C, the total concentration is 2.4mol / l, add polyethylene glycol dispersant, and the concentration of the dispersant is 0.04 mol / l, while adding urea, the concentration of urea is 5 times of the total molar concentration of nickel-cobalt salt.

[0048] (2) Pour the mixed solution into the reaction kettle, turn on the electricity and stir while raising the temperature, the stirring speed is 200r / min, the heating rate is 1°C / min, stop the heating when the temperature reaches 95°C, and keep stirring at this temperature for 8 hours .

[0049] (3) Take out the reactant and wash it with pure water until the conductivity of the washing water = 80 us / cm, then dry it until the moisture content = 0.6%. Then the material is passed through a 200-mesh sieve, and the undersize is taken.

[0050] (4) Put the sieved material into the reduction furnace and ...

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Abstract

The invention relates to a preparation process of functional powder materials, and in particular to a preparation method of superfine nickel-cobalt alloy powder. The preparation method of the superfine nickel-cobalt alloy powder comprises the following steps that (1) mixing nickel-cobalt solution, a dispersing agent and urea according to a certain ration; (2) preparing a nickel-cobalt precursor precipitate by homogeneous precipitation reaction; (3) washing, drying and screening the nickel-cobalt precursor precipitate; (4) carrying out hydrogen reduction on the nickel-cobalt precursor precipitate to obtain the nickel-cobalt alloy powder; and (5) crushing, screening and packaging the nickel-cobalt alloy powder to carrying out post-treatment. Compared with an existing method, the preparation method adopts the homogeneous coprecipitation to prepare the nickel-cobalt precursor, then the hydrogen reduction is carried out to obtain the superfine nickel-cobalt alloy powder, and the obtained product is uniform in particle size distribution and low in impurity (carbon, sulfur and the like) content, the powder is spherical, products with the particle size ranging from 0.2 micrometers to 10 micrometers can be prepared, and the nickel-cobalt alloy powder can be widely applied to various industries.

Description

technical field [0001] The invention relates to a preparation process of powder functional materials, in particular to a preparation method of ultrafine nickel-cobalt alloy powder. Background technique [0002] With the rapid development of science and technology, people put forward different requirements for materials. Ultrafine particles have obvious small size effect and surface effect, which have attracted the interest of many researchers for a long time. Powders with small and uniform grain size, low degree of agglomeration, large specific surface area, and high chemical activity provide broad prospects for the development of new materials. Ultrafine nickel-cobalt (Ni-Co) alloy powder has special properties, which are different from the physical, chemical, magnetic and mechanical properties of general pure nickel and cobalt metal powders. It is used in hard alloys, hydrogen storage alloys, magnetic materials, catalysts, electroplating , batteries and other industries h...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00
CPCB22F9/22B22F1/065
Inventor 张成亮章泸尹张亚敏
Owner 张成亮
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