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Spherical silver powder and preparation method thereof

A silver powder and spherical technology, applied in the field of metal powder and its preparation, can solve the difficult application requirements of product purity, particle size, shape and other performance characteristics, long preparation cycle, heavy environmental pollution and other problems, and achieve particle size distribution The effect of narrow range, short preparation cycle and high purity

Active Publication Date: 2012-08-15
NAT UNIV OF DEFENSE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The silver powder in the existing conductive silver paste is generally prepared by the liquid phase chemical reduction method, but the existing preparation process not only has a relatively complicated process, a long preparation cycle, and serious environmental pollution, but also the obtained products have different characteristics in terms of purity, particle size, It is often difficult to meet the requirements of subsequent applications in terms of performance characteristics such as morphology

Method used

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  • Spherical silver powder and preparation method thereof
  • Spherical silver powder and preparation method thereof
  • Spherical silver powder and preparation method thereof

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Effect test

Embodiment 1

[0034] a kind of like figure 1 and figure 2 As shown in the spherical silver powder of the present invention, the particle size distribution range of the spherical silver powder is 0.2 μm to 5 μm, the particle size distribution is concentrated, and D 50 The particle size is 1.63μm; the tap density of the spherical silver powder is 4.12g / cm 3 , the specific surface area of ​​the spherical silver powder is 0.46m 2 / g.

[0035] The spherical silver powder of the present embodiment is mainly prepared through the following steps:

[0036] (1) Weigh 20.0g of L-ascorbic acid, dissolve it in 500mL deionized water, and make 40g / L reducing agent solution A; weigh 7.0g of PVP, dissolve it in 200mL of distilled water at 40℃~60℃, Heat-promoting and forming protective agent solution B; then adding protective agent solution B dropwise into reducing agent solution A, and stirring evenly; adding 24wt% ammonia water to adjust the pH value so that the pH value is about 4.0 to prepare the re...

Embodiment 2

[0041] a kind of like image 3 and Figure 4 As shown in the spherical silver powder of the present invention, the particle size distribution range of the spherical silver powder is 1.5 μm to 4 μm, the particle size distribution is concentrated, D 50 The particle size is 2.41μm; the tap density of the spherical silver powder is 3.64g / cm 3 , the specific surface area of ​​the spherical silver powder is 0.24m 2 / g.

[0042] The spherical silver powder of the present embodiment is mainly prepared through the following steps:

[0043] (1) Weigh 20.0g of L-ascorbic acid, dissolve it in 1L of deionized water, and make 20g / L reducing agent solution A; heat 400mL of deionized water to 50°C, add 16.4g of PVP, stir and dissolve to make a protective agent Solution B; then add the protective agent solution B dropwise into the reducing agent solution A, and stir evenly to obtain the reaction bottom liquid;

[0044] (2) Take an appropriate amount of 24 wt% ammonia water, add deionized ...

Embodiment 3

[0048] a kind of like Figure 5 and Figure 6 As shown in the spherical silver powder of the present invention, the particle size distribution range of the spherical silver powder is 1.5 μm to 5 μm, the particle size distribution is concentrated, D 50 The particle size is 2.95μm; the tap density of the spherical silver powder is 3.71g / cm 3 , the specific surface area of ​​the spherical silver powder is 0.2m 2 / g.

[0049] The spherical silver powder of the present embodiment is mainly prepared through the following steps:

[0050] (1) Weigh 300.0g of L-ascorbic acid, dissolve it in 7.5L of deionized water, make 40g / L reducing agent solution A, and then add it to the reaction kettle; heat 3L of deionized water to 50°C and add 170g of PVP, Stir and dissolve for 30 minutes to make protective agent solution B; then add protective agent solution B into the reaction kettle, stir evenly with reducing agent solution A, and prepare the reaction bottom liquid;

[0051] (2) Take an ...

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Abstract

The invention discloses a spherical silver powder, wherein the particle size distribution range of the spherical silver powder is 0.1-5 mum, and the D50 particle size is 1.0-3.5 mum; the tap density of the spherical silver powder is greater than 3.6 g / cm<3>; and the specific surface area of the spherical silver powder is less than 1.0 m<2> / g. The preparation method for the spherical silver powder comprises the following step of: with L-ascorbic acid as a reductive agent and polyvinylpyrrolidone as a protective agent, reducing silver out of a reaction material, namely silver nitrate solution, by a chemical reduction method, wherein the pH value of the reaction system is controlled to be constant between 3 to 6 during the whole reaction process of the chemical reduction method, so as to keep the speed of the reduction reaction for silver nitrate stable. The spherical silver powder disclosed by the invention is narrow in particle size distribution range, excellent in dispersity, high in tap density, small in specific surface area, and especially suitable for preparing a silver paste for the electrode of a solar cell and the electrode of a plasma displayer.

Description

Technical field [0001] The invention involves a metal powder and its preparation method, especially a silver powder and its preparation method. Background technique [0002] As a renewable energy source, solar energy has always attracted the attention of countries around the world, and solar cells are one of the most effective ways to develop and use solar energy.The development of high -efficiency solar cells is one of the core technologies that effectively use solar energy.There are many factors that affect the efficiency of solar cell conversion. The preparation of front electrodes is one of the important influencing factors.As the main raw material for preparation of the front electrode, the metal -conductive silver pulp has high requirements for the silver powder it contains.The silver powder currently used in the front electrode slurry of the solar cell is generally required that the average particle size is between 1 μm and 5 μm, the spherical shape, and the particle size ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 张为军刘卓峰堵永国白书欣李文焕杨鹏彪马振兴
Owner NAT UNIV OF DEFENSE TECH
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