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A kind of silver powder with high sintering activity and its preparation method and application

A sintering activity, silver powder technology, applied in transportation and packaging, metal processing equipment, coating and other directions, can solve the problems of low surface sintering activity, affecting the application effect, and changing the physical and chemical properties of tap density, so as to improve the surface sintering activity, The effect of improving performance and reducing sintering temperature

Active Publication Date: 2021-08-27
广东羚光新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But the silver powder of prior art has the problem that surface sintering activity is low, and the method that generally improves surface sintering activity is to reduce silver powder particle diameter, improve specific surface area, but these methods can cause other physical and chemical properties changes such as tap density, for silver content relatively For high front silver paste, it directly affects its application effect

Method used

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  • A kind of silver powder with high sintering activity and its preparation method and application
  • A kind of silver powder with high sintering activity and its preparation method and application
  • A kind of silver powder with high sintering activity and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A kind of highly active silver powder is prepared by the following method:

[0056] (1) Weigh 15kg of raw silver powder and pour it into the batching barrel, add water to form a 25kg material system, turn on the high-pressure homogenizer to circulate and homogeneously disperse the material; during the dispersion process, weigh 0.7kg of silver nitrate and dissolve 10g of gum arabic Liquid, 150g diethanolamine is added in the material, makes material form uniform system.

[0057] (2) During the homogeneous dispersion process of the material, the material in the batching tank is heated. After the material is heated to a temperature of 75° C., a solution containing 200 g of sodium hydroxide is added to the material by using a peristaltic pump to make the material react.

[0058] (3) After the material is homogeneously dispersed and the reaction is completed, add water to wash the material until the conductivity is lower than 20μs / cm. After centrifugation, add a solution con...

Embodiment 2

[0061] A kind of highly active silver powder is prepared by the following method:

[0062] (1) Weigh 15kg of raw silver powder and pour it into the batching barrel, add water to form a 25kg material system, turn on the high-pressure homogenizer to circulate and homogeneously disperse the material; weigh 1.5kg of silver nitrate and a solution containing 60g of gelatin during the dispersion process 230g of triethanolamine is added to the material to make the material form a uniform system.

[0063] (2) During the homogeneous dispersion process of the material, the material in the batching tank is heated. After the material is heated to a temperature of 50° C., a solution containing 450 g of sodium hydroxide is added to the material by using a peristaltic pump to make the material react.

[0064] (3) After the material is homogeneously dispersed and the reaction is completed, add water to wash the material until the conductivity is lower than 20μs / cm. After centrifugation, add a ...

Embodiment 3

[0067] A kind of highly active silver powder is prepared by the following method:

[0068] (1) Weigh 20kg of raw silver powder into the batching barrel, add water to form a 27kg material system, turn on the high-pressure homogenizer to circulate and homogeneously disperse the material; during the dispersion process, weigh 1.0kg of silver nitrate, 50g of gelatin and 10g of poly A solution of vinyl alcohol (P-2000) and 150 g of glycerol were added to the material to form a uniform system.

[0069] (2) During the homogeneous dispersion process of the material, the material in the batching tank is heated, and after the material is heated to a temperature of 65° C., a solution containing 250 g of sodium hydroxide is added to the material by using a peristaltic pump to make the material react.

[0070] (3) After the material is homogeneously dispersed and the reaction is completed, add water to wash the material until the conductivity is lower than 20μs / cm. After centrifugation, add...

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Abstract

The invention provides a silver powder with high sintering activity, a preparation method and application thereof, and relates to the fields of metal powder metallurgy and surface modification of powder materials. The preparation method of the present invention comprises the following steps: S1, mixing the raw material silver powder with water to form a silver powder system, carrying out circulation and homogeneous dispersion of the silver powder system, adding silver nitrate, a dispersant and a weak reducing agent, and mixing uniformly; S2, The system in step S1 is heated to 40-80°C, a pH regulator is added until the pH is 8-13, and a reduction reaction is carried out; S3, after the reaction is completed, the obtained silver powder is cleaned and separated to obtain silver powder with high sintering activity. The silver powder prepared by the present invention is a coating powder, and a nano-silver film is coated on the surface of the silver powder inner core. The nano-silver film has a high specific surface area, improves the surface sintering activity of the silver powder, and reduces the sintering temperature of the solar silver paste. Basically, the physical and chemical properties of the silver powder core can be retained.

Description

technical field [0001] The invention relates to the fields of metal powder metallurgy and surface modification of powder materials, in particular to a silver powder with high sintering activity and its preparation method and application. Background technique [0002] With the development of my country's new energy strategic industry, silver powder for solar photovoltaic cell electrode materials has a very broad market application prospect. At present, my country's solar energy industry continues to develop and improve. The existing scale is huge and occupies an important position in the global solar industry. However, my country's solar front electrode silver paste still has a certain distance from the world's top level. Some key technologies and key materials Still need to rely on imports, for example, conductive silver paste and silver powder for solar photovoltaic cell electrode materials. [0003] There are many preparation methods of existing silver powder, including ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B22F1/00H01L31/0224
CPCB22F9/24H01L31/022425B22F1/054B22F1/07B22F1/14B22F1/17Y02E10/50
Inventor 梁炳联娄红涛冯辉邱衍嵩万广宇唐国辉梁俊展张旭玲黄雨佳舒斌
Owner 广东羚光新材料股份有限公司
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