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Preparation method of micron-sized high-activity spherical silver powder

A high-activity, micron-scale technology, applied in the field of high-activity spherical silver powder, can solve the problems of low sintering activity, poor crystallinity, and low yield, and achieve the effect of narrow particle size distribution and good activity.

Inactive Publication Date: 2014-01-15
西北稀有金属材料研究院宁夏有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method has the disadvantages of large investment, high cost, and low yield. At present, most of the production of silver powder in the electronics industry is based on the liquid phase reduction method, and a few are prepared by the fire method.
The production process of the liquid phase reduction method is simple, the technical parameters are easy to control, the cost is low, the production cycle is short, and it is suitable for industrial production, but the product generally has the defect of poor crystallinity; if the silver powder prepared by the fire method has high crystallinity, but the sintering activity is low
[0004] The disadvantages of the above-mentioned liquid phase reduction method are: poor crystallinity; the disadvantages of the above-mentioned fire method are: low sintering activity

Method used

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  • Preparation method of micron-sized high-activity spherical silver powder
  • Preparation method of micron-sized high-activity spherical silver powder
  • Preparation method of micron-sized high-activity spherical silver powder

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of the reaction solution: Add 80 g of silver nitrate, 150 g of ammonia water with a mass fraction of 24%, and 1.2 g of sodium hydroxide to 3000 g of deionized water, adjust the temperature of the solution to 50° C. while stirring, and then stir for 3 minutes.

[0020] Reduction and precipitation of silver powder: Add 0.1 g of stearic acid and 320 g of formaldehyde solution with a mass fraction of 26% to the above solution at a constant speed for 30 seconds, and stir for another 10 minutes after the addition is completed to make the silver particles grow fully.

[0021] Reduction of silver powder treatment: After the above treatment is completed, let it stand for 10 minutes, wash and filter with deionized water to separate the solid from the liquid, take the solid and dry it at 50°C to obtain spherical silver powder for use.

[0022] Inorganic bonding powder preparation:

[0023] 1. Add 25mol% SiO 2 , 15mol% B 2 o 3 , 52mol% Bi 2 o 3 Add a total of 100g ...

Embodiment 2

[0028] Preparation of the reaction solution: add 90 g of silver nitrate, 200 g of ammonia water with a mass fraction of 24%, and 1.5 g of sodium hydroxide to 3000 g of deionized water, adjust the temperature of the solution to 60° C. while stirring, and then stir for 5 minutes.

[0029] Reduction and precipitation of silver powder: Add 0.15 g of stearic acid and 400 g of formaldehyde solution with a mass fraction of 20% to the above solution at a constant speed for 25 seconds. After the addition is completed, stir for another 15 minutes to fully grow the silver particles.

[0030] Reduction silver powder treatment: After the above treatment is completed, let it stand for 12 minutes, wash and filter with deionized water to separate the solid from the liquid, take the solid and dry it at 60°C to obtain spherical silver powder for use.

[0031] Inorganic bonding powder preparation:

[0032] 1. Add 21mol% SiO 2 , 18mol% B 2 o 3 , 56mol% Bi 2 o 3 Add a total of 100g of 5mol% Z...

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Abstract

The invention relates to a high-activity spherical silver powder for solar and micro-electronic devices, and particularly relates to a preparation method of micron-sized high-activity spherical silver powder. The preparation method is characterized by comprising the following steps of: adding a formaldehyde solution with the mass percentage of 20-37% and stearic acid into a silver-ammonia solution prepared from silver nitrate, sodium hydroxide, liquid ammonia with the mass percentage of 20-25% and de-ionized water to react to obtain spherical silver powder slurry; uniformly mixing silver powder obtained by solid-liquid separation and drying treatment with inorganic bonding powder, adding a surfactant and dispersing at a high speed; and then, carrying out heat treatment in an environment of 180-400 DEG C for 4-16 hours, and washing and drying to obtain the micron-sized high-activity spherical silver powder. The micron-sized high-activity spherical silver powder prepared by the method disclosed by the invention has a narrow granularity distribution range and good activity; the surface of the micron-sized high-activity spherical silver powder is provided with the inorganic bonding powder, so that the micron-sized high-activity spherical silver powder is particularly suitable for the solar and micro-electronic device industry.

Description

technical field [0001] The invention relates to a high-activity spherical silver powder for solar energy and microelectronic devices, in particular to a preparation method of a micron-level high-activity spherical silver powder. Background technique [0002] Silver powder is a material used to prepare stable molded electronic products and plays an extremely important role in the electronics industry. As an important conductive functional phase in high-temperature sintered electronic paste, spherical silver powder is a key component of the inner electrode of electronic components and the front electrode material of solar cells. However, with the development of electronic devices towards miniaturization and high performance, higher requirements are put forward for spherical silver powder, including sintering activity, sphericity, crystallinity, particle size distribution, tap density, purity and other properties of spherical silver powder particles. Indicators put forward hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 王立惠郑伟施文峰刘玲
Owner 西北稀有金属材料研究院宁夏有限公司
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