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Preparation method of micron spherical silver powder

A silver powder and spherical technology, which is applied in the field of micron spherical silver powder preparation, can solve the problems of powder non-flowability, narrow powder particle size, unfavorable coating or powder spreading density, etc., and achieve the effect of wide particle size distribution and high sphericity

Pending Publication Date: 2022-06-07
晶高优材(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional preparation methods of silver powder, spherical silver powder is prepared by chemical methods such as reduction or by evaporation, condensation and vapor deposition. However, due to the fine particle size and low sphericity of the powder prepared by chemical methods such as reduction, it is not suitable for spraying and additive manufacturing. Powder demand, the particle size of the powder prepared by evaporation condensation and vapor deposition method is too narrow, which is not conducive to the improvement of coating or powder spreading density
[0005] In the invention patent with the application number 201910516988.X, a method for preparing a nearly spherical silver powder is disclosed. The method involves chemical coating, sintering, washing and drying of the silver powder raw material, and the particle size range of the prepared powder is 0.5μm-3μm, the powder within this particle size range has no fluidity, which does not meet the needs of spraying and additive manufacturing processes
In the invention patent with the application number 201910288859.X, a preparation device and method for spherical micron silver powder are disclosed. The problem of wide diameter distribution and large difference in shape, the particle size range of the powder prepared by this process is between 1-3 μm, which is not suitable for the demand of spherical silver powder for spray coating and additive manufacturing process

Method used

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  • Preparation method of micron spherical silver powder
  • Preparation method of micron spherical silver powder
  • Preparation method of micron spherical silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Under the protection of inert gas, the silver ingot that meets the composition requirements is put into a zirconia melting crucible as a raw material for melting. When the temperature of the silver metal liquid reaches 1260 °C, the silver metal liquid is poured through the graphite guide device below and flows into the annular slot high pressure atomizer. In the annular slot high pressure atomizer, the silver metal liquid is broken and dispersed by the high pressure gas to form silver metal. The droplets enter the atomization chamber of the annular slot high-pressure atomizer, the atomization pressure of the annular slot high-pressure atomizer is 4MPa, the high-pressure gas is argon, and the silver metal droplets are in the annular slot high-pressure atomizer. During the flight of the atomization chamber of the atomizer, spherical silver powder formed by spheroidization and solidification through its own surface tension falls into the powder collection tank at the end of...

Embodiment 2

[0037] Under the protection of inert gas, the silver ingot that meets the composition requirements is put into a zirconia melting crucible as a raw material for melting. When the temperature of the silver metal liquid reaches 1300 °C, the silver metal liquid is poured through the graphite guide device below and flows into the annular slot high pressure atomizer. In the annular slot high pressure atomizer, the silver metal liquid is broken and dispersed by the high pressure gas to form silver metal. The droplets enter the atomization chamber of the annular slot high pressure atomizer, the atomization pressure of the annular slot high pressure atomizer is 5MPa, the high pressure gas is nitrogen, and the silver metal droplets are atomized in the annular slot high pressure atomization. During the flight of the atomizing chamber of the atomizer, spherical silver powder formed by spheroidization and solidification through its own surface tension falls into the powder collection tank ...

Embodiment 3

[0039] Under the protection of inert gas, the silver ingot that meets the composition requirements is put into a graphite melting crucible as a raw material for melting. When the temperature of the silver metal liquid reaches 1300 °C, the silver metal liquid is poured through the graphite guide device below and flows into the annular slot high pressure atomizer. In the annular slot high pressure atomizer, the silver metal liquid is broken and dispersed by the high pressure gas to form silver metal. The droplets enter the atomization chamber of the annular slot high pressure atomizer, the atomization pressure of the annular slot high pressure atomizer is 4.5MPa, the high pressure gas is argon, and the silver metal droplets are in the annular slot high pressure During the flight of the atomization chamber of the atomizer, spherical silver powder formed by spheroidization and solidification through its own surface tension falls into the powder collection tank set at the end of the...

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Abstract

The invention discloses a micron spherical silver powder preparation method which solves the problems that in the prior art, due to the fact that powder is small in particle size and not high in sphericity degree, powder requirements for spraying and additive manufacturing are not met, and due to the fact that the particle size of the powder is too narrow, improvement of coating or powder laying density is not facilitated; according to the preparation method provided by the embodiment of the invention, the sphericity degree of the prepared spherical silver powder is high, the spherical silver powder with different particle size distribution ranges can be obtained, the particle size distribution of the prepared spherical silver powder is wider, and the powder using requirements in the fields of spraying, additive manufacturing and the like can be met.

Description

technical field [0001] The invention relates to the technical field of powder material preparation, in particular to a preparation method of micron spherical silver powder. Background technique [0002] Silver has stable properties, and its thermal conductivity and electrical conductivity are the highest among all metals at room temperature and pressure. It has the characteristics of high reflectivity for light with wavelengths above 450 nm, and is often used as an industrial conductive and reflective material. In addition, silver is also a precious metal, which can be used to make jewelry, medals, trophies, medals and other craft decorations. [0003] In the spraying process, the silver powder is uniformly coated on the surface of the workpiece by high-pressure airflow, so as to achieve high electrical conductivity, thermal conductivity and high reflectivity. In the additive manufacturing process, the powder is spread on the forming platform by scraper motion. Floor. Amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/14
CPCB22F9/082Y02P10/25
Inventor 刘路
Owner 晶高优材(北京)科技有限公司