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Method for preparing nano metal powder

A nano-metal powder and metal technology, which is applied in the field of preparing nano-metal powder, can solve the problems of complex post-treatment of the reaction system, unfavorable environmental protection, etc., and achieve controllable powder particle size, simple process and equipment, and good monodispersity Effect

Inactive Publication Date: 2006-04-26
HUANA PHOTOELECTRIC MATERIAL GUILIN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of method is simple in process and low in cost, the post-treatment of the reaction system is complicated, which is not conducive to environmental protection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, select calcium chloride to be molten salt. Commercially available metal copper and calcium chloride with a total amount of 1000 grams and a molar ratio of 1:15 were mixed and melted at 1200 ° C, and the molten material was stirred and protected with nitrogen at 2 atmospheres, and then melted under the protection of nitrogen. The solid solution was obtained by natural cooling of the solid solution, the solid solution was placed in deionized water, and the water-soluble calcium chloride was filtered and washed to remove it, and the filtered insoluble matter was subjected to vacuum freeze-drying to obtain nano-metal copper powder with a particle size of 50nm.

Embodiment 2

[0019] Embodiment 2, select sodium carbonate to be molten salt. A total amount of 800 grams and a ratio of 1:5 commercially available metal copper and sodium carbonate are mixed and melted at 1200 ° C, and the melt is sheared and dispersed with a silicon nitride stirring paddle at 2000 rpm, followed by Under the protection of nitrogen, the molten material is sprayed with water, the water-soluble salt is filtered and washed, and the filtered insoluble matter is vacuum-dried at 40° C. to obtain nano-metal copper powder with a particle size of 500 nm.

Embodiment 3

[0020] Embodiment 3, select potassium sulfate to be molten salt. A total amount of 1000 grams of commercially available metal copper and potassium sulfate with a molar ratio of 1:4 was mixed and melted at 1200 ° C, and the molten material was stirred and protected with nitrogen at 5 atmospheres, and the molten material was subsequently melted under nitrogen protection. Cool naturally to obtain a solid solution, place the solid solution in deionized water, filter and wash the water-soluble salt, and vacuum-dry the filtered insoluble matter at 30°C to obtain nano-metal copper powder with a particle size of 20nm.

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PUM

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Abstract

A method for preparing nanometer metal powder, which is to melt metals in a certain weight ratio and corresponding soluble molten salts and then mix them. After the melts are naturally mixed or forced to be uniform, they are cooled and water-soluble, and finally the soluble molten salts are mixed. The salt is removed by filtration, and the insoluble matter is dried to obtain nanometer metal powder. The nanometer metal powder prepared by the method has high purity, good monodispersity, controllable particle size, simple procedure and equipment, low cost, easy operation and no pollution, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a method for preparing nanometer metal powder, in particular to a method for preparing nanometer metal powder from molten metal in a molten salt dispersion manner. Background technique [0002] Due to the small size, large specific surface area and quantum size effect, nano-metal powders exhibit many novel characteristics different from conventional solids, and show broad prospects in high-tech applications; and the research on methods and technologies for preparing nano-metal powders Also in the ascendant. The current common methods for preparing nano-metal powders mainly include: [0003] 1. Preparation by gas phase method, including condensation of inert gas, sputtering method, plasma method, etc. For example, Chinese patent application CN1106325A proposes to use DC arc plasma to prepare nanopowder, that is, the carrier gas carries the raw material metal into the plasma chamber, and passes through the plasma The body is he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08
Inventor 徐华蕊
Owner HUANA PHOTOELECTRIC MATERIAL GUILIN CITY