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Method for preparing nanometer cobalt powders with spherical face-centered cubic structures by using mechano-chemical method

A technology of mechanochemical method and cubic structure, which is applied in the field of preparation of nano-spherical face-centered cubic structure cobalt powder by mechanochemical method, which can solve the problems of poor compatibility of polymers, affecting actual efficacy, and easy agglomeration, etc., to reduce ball milling Mixing time, low processing cost, good shape effect

Active Publication Date: 2014-04-16
重庆金锐新材料技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the preparation process of nano-powders, due to the large specific surface area and high specific surface energy of materials, they are prone to agglomeration, difficult to disperse in organic media, and poor compatibility with polymers, which directly affects their actual efficacy.

Method used

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  • Method for preparing nanometer cobalt powders with spherical face-centered cubic structures by using mechano-chemical method
  • Method for preparing nanometer cobalt powders with spherical face-centered cubic structures by using mechano-chemical method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Ingredients:

[0030] According to the stoichiometric ratio of each element in the chemical formula, weigh the corresponding oxalic acid H 2 C 2 o 4 2H 2 O2mol, cobalt nitrate Co(NO 3 ) 2 ·6H 2 01mol; Then take respectively surfactant cetyltrimethylammonium bromide and Polyethylene Glycol 1000 of 0.2wt% of the total mass of the above medicines;

[0031] 2. Ball milling:

[0032] The weighed oxalic acid H 2 C 2 o 4 2H 2 O, cobalt nitrate Co(NO 3 ) 2 ·6H 2 O. Cetyltrimethylammonium bromide and polyethylene glycol 1000 are fully mixed; then ball milled (ball-to-material ratio 3:1), absolute ethanol is added during ball milling, and the amount of ethanol added is kept dispersed by the ball milling system After 2 hours of ball milling time, suction filtration was performed, and an appropriate amount of alcohol was added after washing to obtain a precursor solution.

[0033] 3. Spheroidizing spray drying:

[0034] The prepared solution was dried with a sphe...

Embodiment 2

[0040] 1. Ingredients:

[0041] According to the stoichiometric ratio of each element in the chemical formula, weigh the corresponding oxalic acid H 2 C 2 o 4 2H 2 O1.5mol, cobalt nitrate Co(NO 3 ) 2 6H O1mol; Then take respectively the surfactant cetyltrimethylammonium bromide and polyethylene glycol 1000 of 0.3wt% of the total mass of the above medicines;

[0042] 2. Ball milling:

[0043] The weighed oxalic acid H 2 C 2 o 4 2H 2 O, cobalt nitrate Co(NO 3 ) 2 ·6H 2 O. Cetyltrimethylammonium bromide and polyethylene glycol 1000 are fully mixed; then ball milled (ball-to-material ratio 3:1), absolute ethanol is added during ball milling, and the amount of ethanol added is kept dispersed by the ball milling system After 3 hours of ball milling, suction filtration was added, and an appropriate amount of alcohol was added after washing to obtain a precursor solution.

[0044] 3. Spheroidizing spray drying:

[0045] The prepared solution was dried with a spheroidizi...

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Abstract

The invention provides a method for preparing nanometer cobalt powders with spherical face-centered cubic structures by using a mechano-chemical method, which belongs to the technical field of preparing metal powders from metal material. The method comprises the following steps of: weighting the corresponding oxalic acid, cobalt salt and surfactant according to the stoichiometric ratio of each element in a chemical formula, and then mixing; ball-milling, leaching and washing to obtain a precursor liquid; balling and atomizing to prepare the spherical precursors; splitting and reducing the precursors in a nitrogen-hydrogen atmosphere; and finally dispersing through sealed gas flow and performing vacuum packaging to obtain the target matters. The nanometer cobalt powders prepared by the method provided by the invention has the following characteristics: the average particle size is smaller than 200 nanometers, the structure is a 100% face-centered cubic structure, the purity is larger than 99.9% (excepting the oxygen content), the oxygen content is smaller than 1.0%, the appearances of the particles are in spherical shapes, and the size distribution is good. The method is widely applied to the ultrafine and nanometer-scale hard alloy, the ball-milling and mixing time can be reduced, cobalt pools can be reduced, and the performances of the hard alloy can be improved. The production process of the method is simple, so that the method is easy to operate.

Description

1. Technical field [0001] The invention belongs to the technical field of preparation of metal powder in metal materials, and in particular relates to a method for preparing cobalt powder with a nano-spherical face-centered cubic structure by a mechanochemical method. 2. Background technology [0002] Cobalt powder is one of the key raw materials for superhard alloy materials (such as cemented carbide and artificial diamond tools), its performance determines the bonding performance, strength and toughness of superhard alloy materials, and the performance of superhard alloy materials very important. Main use: Widely used in aviation, aerospace, electrical appliances, machinery manufacturing, chemical and ceramic industries. [0003] Since 2000, the consumption of cobalt powder in the world has been increasing, with an average annual growth rate of 10%. By 2008, the consumption of cobalt in the world reached 8700t. In recent years, the cemented carbide industry has developed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
Inventor 邓莹张艳华陈慧田亮亮姜中涛涂铭旌
Owner 重庆金锐新材料技术研究院有限公司
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