Preparation method for micron spherical silver powder for electronic paste

A micron-scale technology for electronic paste, which is applied in the field of preparation of spherical silver powder for micron-scale electronic paste, can solve the requirements of product purity, particle size, shape and other performance characteristics that are difficult to apply, long preparation cycle, and serious environmental pollution. and other problems, to achieve the effect of narrow particle size distribution, good gloss, and good dispersion performance

Inactive Publication Date: 2013-04-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 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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  • Preparation method for micron spherical silver powder for electronic paste
  • Preparation method for micron spherical silver powder for electronic paste
  • Preparation method for micron spherical silver powder for electronic paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Prepare 0.02mol / L silver nitrate solution A and 0.02mol / L ascorbic acid solution C with distilled water respectively, and dissolve bovine serum albumin with 5% silver nitrate mass in distilled water to prepare solution B;

[0028] 2) Pour solution A into solution B at 15°C, then add ammonia water with a mass concentration of 25-28% to adjust the initial pH value to 8, stir well and then press the molar ratio of ascorbic acid: silver nitrate = 1:1 to quickly Add ascorbic acid solution C, react for ten minutes, stop stirring, and finally after ultrasonic dispersion for 6 minutes, stand still, separate, wash with distilled water and absolute ethanol for 1 to 3 times each, and dry at 50°C for 8 hours to obtain the average particle size 0.96μm spherical silver powder, such as figure 1 shown.

Embodiment 2

[0030] 1) Prepare 0.04mol / L silver nitrate solution A and 0.08mol / L ascorbic acid solution C with distilled water respectively, and dissolve bovine serum albumin with 8% silver nitrate mass in distilled water to prepare solution B;

[0031] 2) Pour solution A into solution B at 20°C, then add ammonia water with a mass concentration of 25-28% to adjust the initial pH value to 9, stir well and then press the molar ratio of ascorbic acid:silver nitrate=1.2︰1 to quickly Add ascorbic acid solution C, react for ten minutes, stop stirring, and finally after ultrasonic dispersion for 8 minutes, stand still, separate, wash with distilled water and absolute ethanol for 1 to 3 times each, and dry at 55°C for 6 hours to obtain the average particle size 0.53μm spherical silver powder.

Embodiment 3

[0033] 1) Prepare 0.8 mol / L silver nitrate solution A and 0.8 mol / L ascorbic acid solution C with distilled water respectively, and dissolve bovine serum albumin with 10% silver nitrate mass in distilled water to prepare solution B;

[0034] 2) Pour solution A into solution B at 25°C, then add ammonia water with a mass concentration of 25-28% to adjust the initial pH value to 8.5, stir well and then press the molar ratio of ascorbic acid:silver nitrate=1.4︰1 to quickly Add ascorbic acid solution C, react for ten minutes, stop stirring, and finally after ultrasonic dispersion for 10 minutes, stand still, separate, wash with distilled water and absolute ethanol for 1 to 3 times each, and dry at 52°C for 7 hours to obtain the average particle size 0.34μm spherical silver powder, such as figure 2 shown.

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Abstract

The invention relates to a preparation method for micron spherical silver powder for electronic paste. The preparation method includes the steps of taking bovine serum albumin as a biological template (as a dispersant), adding alkaline silver salt solution and ascorbic acid to mix with the template, stirring the template to realize uniform reaction, and drying the precipitation to obtain the micron silver powder which is of high sphericity, smooth surface and narrow particle size distribution range. The spherical silver powder prepared by the method is of granularity controllable within the range of 0.2-1 micrometer. Furthermore, the spherical silver powder is safe, environment-friendly, low in production cost, simple in process, short in preparation cycle and easy to be subjected to mass production.

Description

technical field [0001] The invention belongs to the technical field of electronic paste manufacturing, and in particular relates to a method for preparing spherical silver powder for micron-scale electronic paste. Background technique [0002] The rapid development of the electronic information industry has driven the development of the electronic paste and ultra-fine silver powder industries. Electronic paste is a high-tech electronic functional material integrating metallurgy, chemical industry and electronic technology. It is one of the essential materials for making electronic components and is widely used in the manufacture of thick film integrated circuits, multilayer ceramic capacitors, In inks, solar cell electrodes and other electronic components. Silver is widely used in the electronics industry because of its optimal room-temperature electrical and thermal conductivity, and silver powder for electronic paste has received more and more attention. [0003] The key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 杨生春杨啊涛张婕梁淑华杨志懋丁秉钧宋晓平
Owner XI AN JIAOTONG UNIV
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