Wet chemical preparation method containing spherical silver powder

A technology of wet chemistry and silver powder, which is applied in the field of preparation of ultra-fine dense spherical silver powder, can solve the problems of many steps, toxicity, and strict conditions, and achieve the effects of good dispersion, good sphericity, and convenient operation

Inactive Publication Date: 2008-12-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The silver powder prepared by this method has excellent roundness and sphericity, and the particle size can be continuously adjusted from 0.3 to 3 μm. However, there are many steps and strict conditions, and some reagents are toxic.

Method used

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  • Wet chemical preparation method containing spherical silver powder
  • Wet chemical preparation method containing spherical silver powder
  • Wet chemical preparation method containing spherical silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: press figure 1 The process flow shown is implemented. Weigh 1g of silver nitrate and dissolve it in deionized water to 50ml, weigh 4.4g of FeSO 4 ·7H 2 O was dissolved in deionized water to a volume of 50ml. Both were cooled to 6°C. Then mix the two completely and homogeneously as soon as possible under stirring conditions. until the color of the solution does not change. Centrifuge, wash with deionized water 3 times, then wash 2 times with absolute ethanol, and vacuum dry at 50°C to obtain silver powder. The obtained silver powder is as figure 2 As shown, it has good sphericity, average particle size of 3.0 μm, good dispersion, narrow particle size distribution and high purity.

Embodiment 2

[0020] Embodiment 2: Take by weighing 2g of silver nitrate and dissolve it in deionized water to settle to 50ml, weigh 8.8g of FeSO 4 ·7H 2 O was dissolved in deionized water to a volume of 50ml. Both were cooled to 6°C. Then mix the two completely and homogeneously as soon as possible under stirring conditions. until the color of the solution does not change. The resulting silver powder was precipitated by centrifugation, washed three times with deionized water, then washed twice with absolute ethanol, and vacuum-dried at 50° C. to obtain silver powder. The obtained silver powder is as image 3 As shown, it has good sphericity, average particle size of 3.5 μm, good dispersion, narrow particle size distribution and high purity. The energy spectrum component analysis of gained silver powder is as follows: Image 6 , the particle size distribution of which is Figure 7 .

Embodiment 3

[0021] Embodiment three: take by weighing 1.2g silver nitrate and dissolve and settle to 50ml with deionized water, take by weighing 8.8gFeSO 4 ·7H 2 O was dissolved in deionized water to a volume of 50ml. Both were cooled to 20°C. Then mix the two completely and homogeneously as soon as possible under stirring conditions. until the color of the solution does not change. The precipitated silver powder was separated by centrifugation, washed three times with deionized water, then washed three times with absolute ethanol, and dried in vacuum at 50°C to obtain silver powder. The obtained silver powder is as Figure 4 As shown, it has good sphericity, average particle size of 1.7 μm, good dispersion, narrow particle size distribution and high purity.

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Abstract

The invention discloses a wet chemical preparation method of a spherical silver powder. The method includes the following steps: the temperatures of silver nitrate solution and FeSO4.7H2O solution are adjusted to 0 to 20 degrees; the two solutions are evenly mixed through agitation until the mixed solution turns yellow to produce silver powder, wherein, the weight ration of silver nitrate and the FeSO4.7H2O solution is 1 to (2 to 8); the silver powder is precipitated from the mixed solution, then the silver powder is washed in deionized water and absolute ethyl alcohol in turn, and then the silver powder is dried. The material used in the invention is non-toxic, the method is simple and is applicable to mass production, the silver powder prepared in the method has the advantages of high degree of sphericity, rough surface, and narrow distribution of particle sizes.

Description

technical field [0001] The invention relates to silver powder preparation technology, in particular to a preparation method of ultrafine dense spherical silver powder. Background technique [0002] Silver paste is the most important material in the field of electronics industry. With the miniaturization of electronic products and the development of micro-nano technology, various conductive pastes are prepared from powder (especially silver powder), which are widely used in the coating of printed circuits. cloth and circuit interconnection. At present, the commonly used methods for preparing silver powder at home and abroad are: thermal decomposition method, electrochemical method, aerosol method, chemical reduction method, etc. The preparation of spherical silver powder mainly adopts aerosol method and chemical reduction method. The aerosol method can obtain spherical silver powder with better roundness, but the powder diameter is greater than 20 μm, 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 吴懿平蔡雄辉安兵吴丰顺
Owner HUAZHONG UNIV OF SCI & TECH
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