Spherical silver powder with controllable granularity and preparation method thereof

A technology of spherical and silver powder, which is applied in the field of precious metal raw material powder and its preparation in the electronic industry, can solve the problems such as difficulty in obtaining micron silver powder, and achieve the effect of uniform shape, uniform particle size and high sphericity

Active Publication Date: 2015-05-27
GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single hydrothermal method can usually only prepare nano-scale silver powder, and it is difficult to obtain micron-scale silver powder
For example, the preparation method disclosed in the Chinese patent document CN 102205421 simply uses the hydrothermal method to prepare silver powder, and can only prepare nano-silver powder below 50 nanometers.

Method used

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  • Spherical silver powder with controllable granularity and preparation method thereof
  • Spherical silver powder with controllable granularity and preparation method thereof

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Effect test

Embodiment 1

[0025] A spherical silver powder with controllable particle size of the present invention has a purity of 99.97%, and a tap density of the spherical silver powder of 4.22g / cm 3 , the particle size D of the spherical silver powder 10 、D 50 、D 90 They are 0.09 μm, 0.13 μm and 0.28 μm respectively, and the particle size is achieved based on the control of the reaction system formulation and reaction conditions during the preparation process.

[0026] The preparation method of the above-mentioned spherical silver powder of the present embodiment specifically comprises the following steps:

[0027] (1) First weigh 1g of silver nitrate and dissolve it in 100ml of deionized water, add 0.7g of sodium dodecylbenzenesulfonate, and mix the two evenly under stirring conditions; add sodium hydroxide to adjust the pH of the mixed solution to 8; Weigh 3ml of formaldehyde solution with a mass fraction of 37%, and add it to the aforementioned mixed solution; immediately transfer the reactio...

Embodiment 2

[0031] A spherical silver powder with controllable particle size of the present invention has a purity of 99.98%, and a tap density of the spherical silver powder of 4.35g / cm 3 , the particle size D of the spherical silver powder 10 、D 50 、D 90 They are 0.16 μm, 0.25 μm and 0.38 μm respectively, and the particle sizes are realized based on the control of the reaction system formulation and reaction conditions during the preparation process.

[0032] The preparation method of the above-mentioned spherical silver powder of the present embodiment specifically comprises the following steps:

[0033] (1) First weigh 1g of silver nitrate and dissolve it in 100ml of deionized water, add 0.6g of PVP, and mix the two evenly under stirring conditions; add sodium hydroxide to adjust the pH of the mixture to 8; and weigh another 3ml with a mass fraction of 37 % formaldehyde solution was added to the aforementioned mixed solution; the reaction solution was immediately transferred to a h...

Embodiment 3

[0037] A spherical silver powder with controllable particle size of the present invention has a purity of 99.98%, and a tap density of the spherical silver powder of 4.46g / cm 3 , the particle size D of the spherical silver powder 10 、D 50 、D 90 They are 0.26 μm, 0.37 μm and 0.49 μm respectively, and the particle sizes are realized based on the control of the reaction system formulation and reaction conditions during the preparation process.

[0038] The preparation method of the above-mentioned spherical silver powder of the present embodiment specifically comprises the following steps:

[0039] (1) First weigh 0.6g of silver nitrate and dissolve it in 50ml of deionized water, add 0.5g of sodium dodecylbenzenesulfonate, and mix the two evenly under stirring conditions; add sodium hydroxide to adjust the pH of the mixed solution to 7; Another 1.3g reductant ferrous sulfate was weighed and dissolved in 50ml deionized water, and added to the aforementioned mixed solution after...

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Abstract

The invention relates to spherical silver powder with controllable granularity. The spherical silver powder has more than 99.9 percent of purity and more than 4.2g/cm<3> of tap density, and the granularity D90 of the spherical silver powder keeps being adjustable within an interval ranged from 0.2 mu m to 0.65 mu m based on a reaction system formula and reaction condition changes during a preparation method thereof. The preparation method of the spherical silver powder comprises the following steps of adopting soluble silver salt as raw materials, and preparing to obtain the nanoscale spherical silver powder through a hydrothermal method; adopting the nanoscale spherical silver powder as silver seed crystal, utilizing sediment reaction to induce the silver seed crystal to grow up uniformly, adjusting the growth degree of the silver seed crystal through controlling a reaction system formula and reaction conditions of the sediment reaction, and further obtaining the spherical silver powder with controllable granularity. The spherical silver powder is regular in shape, uniform in granularity, and can realize controllable granularity through process operation.

Description

technical field [0001] The invention relates to a precious metal raw material powder used in the electronic industry and a preparation process thereof, in particular to a spherical silver powder and a preparation method thereof. Background technique [0002] Silver powder has excellent electrical conductivity and chemical stability, and is one of the most widely used precious metal powders in the electronics industry. In recent years, with the rapid development of the electronics industry, the demand for electronic pastes with silver powder as the main functional phase has grown rapidly. Silver powder is the most critical raw material for preparing electronic paste. The performance of silver powder directly or indirectly affects the performance of the paste and the final conductor, such as film forming process, film thickness change, electrical property change, solderability, adhesion, etc. Therefore, the development of high-quality silver powder has become a key technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 刘务华杨英杰李松林彭天剑
Owner GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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