Method for preparing spherical porous silver powder

A porous silver and spherical technology is applied in the field of preparation of spherical porous silver powder, which can solve the problems of high energy consumption and waste liquid generation, and achieve the effects of low cost, no pollution and good fluidity.

Inactive Publication Date: 2010-12-15
CENT SOUTH UNIV
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Problems solved by technology

The dealloying method with low cost and simple process is the easiest for large-scale production, but both use acid solution, which will produce waste liquid, and method (8) requires high energy-consuming ball milling, and its products are irregular blocks

Method used

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  • Method for preparing spherical porous silver powder
  • Method for preparing spherical porous silver powder
  • Method for preparing spherical porous silver powder

Examples

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Embodiment 1

[0037] Ag / Mg alloy was prepared according to Ag20% (wt) Mg. A vacuum melting method is used to prepare the master alloy. When melting and atomizing under the protection of argon, 3% of metallic magnesium is added to control the atomization temperature to 970°C.

[0038] Using nitrogen as the atomizing medium, control the atomizing pressure to 0.8MPa. The obtained metal powder is shown in Figure 2(a). The metal powder is sieved with a 200-mesh sieve, and the average particle size is about 20 microns.

[0039] Using 3.5% sodium chloride aqueous solution as the silver-magnesium alloy powder leaching agent, first leaching at room temperature for 60 to 90 minutes, when the leaching speed slows down significantly, heat the sodium chloride aqueous solution to 50 ℃ and continue leaching for 30 to 60 minutes ; Finally, use a newly prepared sodium chloride aqueous solution at 100°C for 30 to 60 minutes to extract all the magnesium in the silver-magnesium alloy powder to obtain spherical por...

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Abstract

The invention belongs to the field of the preparation of metal powder and relates to a method for preparing spherical porous silver powder. The spherical porous silver powder is prepared by a method combining gas atomization powder preparation and de-alloying. The method comprises the following steps of: firstly, smelting pure metal silver and magnesium according to a certain proportion; secondly, atomizing alloy melt with gas to prepare spherical alloy powder; and finally, performing de-alloying on micro-powder in salt solution and washing and drying the de-alloyed micro-powder. In the method, spherical porous micro-powder is obtained by combining spray powdering and de-alloying, selected etchant solution is non-toxic and harmless neutral salt solution, operation process is simple and process is environmentally-friendly and suitable for industrial mass production. By the method, components of the alloy and a metal phase removing process can also be designed according to requirements on the porosity and specific surface area of a final product, so the structure, size and hole pattern of the porous silver powder are controlled.

Description

Technical field [0001] The invention belongs to the field of metal powder preparation and relates to a method for preparing spherical porous silver powder. Background technique [0002] Porous metal powder is a new type of material developed in the past ten years. Due to the small particles of metal powder and the large number of internal pores, the porous metal powder has a very large specific surface area, small specific gravity, good energy and electromagnetic wave absorption. Features such as sex, excellent permeability. As a result, this special material with dual properties of function and structure is widely used in fields such as separation, catalysis, sensing, medicine, electrodes, and machinery. [0003] Metallic silver has good catalytic activity. After being made into porous materials, its three-dimensional network structure can make gas and liquid contact and diffuse better. It is an excellent catalyst or catalyst carrier; importantly, highly active porous silver powd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00B22F9/08
Inventor 李海普宋振伟
Owner CENT SOUTH UNIV
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