Method for preparing spherical silver powder

A silver powder, spherical technology, applied in the field of preparation of spherical silver powder, to achieve the effect of uniform particle size distribution, significant economic and social benefits, and low production cost

Inactive Publication Date: 2011-07-06
LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrial preparation of powder materials by spray pyrolysis, especially the application of silver powder, has not been reported.

Method used

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

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Effect test

preparation example Construction

[0018] The invention discloses a preparation method of a spherical silver powder material. The preparation process is to atomize a silver nitrate solution and perform thermal decomposition at a high temperature to obtain a spherical silver powder material. The steps of the preparation process include:

[0019] 1) Ingredients: Silver nitrate solution is prepared according to the silver ion concentration of 10-400g / L.

[0020] 2) Atomization: Atomize the solution in ingredient 1) into droplets of 0.5-100 μm.

[0021] 3) Pyrolysis: pyrolyze the droplets obtained in 2) at 200-900°C under controlled atmosphere conditions (nitrogen, hydrogen, carbon monoxide) for 1-30 minutes.

Embodiment 1

[0023] Configure a silver nitrate solution with a silver ion concentration of 100g / L; atomize the solution through an atomizer; spray the atomized droplets into a heating furnace, and heat for 30 minutes at a temperature of 300°C and a hydrogen reducing atmosphere. The obtained spherical silver powder has complete crystal form, no impurity phase, uniform particle size distribution, D50 of 1 μm, and tap density of 1.42 g / cm 3 , Oxygen content 0.1%.

Embodiment 2

[0025] Prepare a silver nitrate solution with a silver ion concentration of 100g / L; atomize the solution through an atomizer; spray the atomized droplets into a heating furnace, and heat for 10 minutes at a temperature of 500°C and a carbon monoxide reducing atmosphere. The obtained spherical silver powder has complete crystal form, no impurity phase, uniform particle size distribution, D50 of 2 μm, and tap density of 2.45 g / cm 3 .

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Abstract

The invention discloses a method for preparing spherical silver powder, relating to a method for preparing conductive silver paste in electronic industry. The method for preparing spherical silver powder is characterized by comprising the following steps: atomizing the dissolvable silver salt solution, carrying out thermal decomposition under conditions of high temperature and controllable atmosphere and then preparing spherical silver powder. In the method, the dissolvable silver salt solution is used as raw materials and is atomized, and then thermal decomposition is conducted to the mixing solution at high temperature and under controllable atmosphere so as to generate the spherical silver powder. With the method, the preparation process from the solution to the spherical silver powder can be continuously realized by one step, the granularity of the prepared spherical silver powder is controllable within the range of 0.2-20 micrometers, the granularity of the powder is uniformly distributed and has even compositions and is excellent in performance. The preparation method is energy-saving and environment-friendly, and has low production cost and obvious economic and social benefits.

Description

technical field [0001] A method for preparing spherical silver powder relates to a method for preparing spherical silver powder used in the preparation of conductive silver paste in the electronic industry. Background technique [0002] Spherical silver powder is mainly used in the electronics industry to manufacture conductive silver paste, including internal and external electrode silver paste for chip components, thick film integrated circuit conductor silver paste, Taihangneng battery electrode silver paste, etc. [0003] Conductive silver paste refers to the silver paste that is printed on conductive substrates to make them conductive, and is generally printed on non-conductive substrates such as plastic, glass, ceramics or cardboard. The silver paste used in the photovoltaic industry is printed on the surface of solar cells and used as electrodes. The printing of electrodes with silver paste on the battery board and the quality of the silver paste directly affect the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 闫忠强王红忠郭幸江名喜郭丹马骞胡腊梅路维华
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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