Silicon oxide compound silver powder and preparation method thereof as well as conductive silver paste

A technology of conductive silver paste and silicon oxide, applied in metal/alloy conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. The effect of improving electrical performance and reducing cost

Inactive Publication Date: 2011-11-09
深圳市新合富力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems of poor dispersibility and poor conductivity of silver powder of conductive paste existing in the prior art

Method used

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  • Silicon oxide compound silver powder and preparation method thereof as well as conductive silver paste
  • Silicon oxide compound silver powder and preparation method thereof as well as conductive silver paste

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The invention provides a kind of preparation method of silica composite silver powder, comprises the following steps:

[0018] a. Mix the silver powder and neutral silica sol evenly, wash, dry, and pulverize to obtain the initial product;

[0019] b. Dispersing the initial product in step a in ethanol, adding a dispersing aid, ball milling, washing, drying and pulverizing to obtain the silicon oxide composite silver powder.

[0020] The preparation method of the neutral silica sol adopted in the present invention is well known to those skilled in the art, for example, it can be prepared by the following method: deionized water, ethanol, ethyl tetrasilicate and nitric acid are mixed in a mass ratio of 15- 20: 150-200: 70-80: 0.5-1.0 and mix evenly, then add lye to adjust the pH value to 5-7 to obtain the neutral silica sol. Preferably, the mass ratio of deionized water, ethanol, tetraethyl orthosilicate and nitric acid is 36:320:145:1. The lye is various alkalis common...

Embodiment 1

[0038] This example is used to illustrate the silicon oxide composite silver powder provided by the present invention and its preparation method.

[0039] a. Preparation of neutral silica sol: mix deionized water, ethanol, tetraethyl orthosilicate and nitric acid evenly in a mass ratio of 36:350:150:1.5, mechanically stir for 1 hour, settle for 1 day, and then add alkali The pH value of the solution was adjusted to 5-7, and the neutral silica sol was obtained by filtration.

[0040] b. Disperse 500 g of spherical silver powder with an average particle size of 1.30 μm in the neutral silica sol in step a, mechanically stir for 20 minutes, wash with ethanol for 3 times, dry and pulverize to obtain the initial product.

[0041] c. Disperse the initial product of step b in 800g ethanol, add dispersing aids glycerol 4.5g, PVP 3.5g, zinc stearate 3.0g, then add 3500g zirconia balls (□3) into the planetary ball mill (Nanjing University Instrument Factory), ball milled for 10 hours, w...

Embodiment 2

[0043] Adopt the method similar to Example 1 to prepare the silicon oxide composite silver powder of the present embodiment, the difference is: in the step b, get 500g of spherical silver powder with an average particle diameter of 1.50 μm and soak it in the neutral silica sol, mechanically stir for 30 Minutes, washed 3 times with ethanol, dried and pulverized.

[0044] Through the above-mentioned steps, the silicon oxide composite silver powder of this embodiment was obtained, denoted as A2, and the mass ratio of silicon oxide and silver particles in the silicon oxide composite silver powder was 2.24:100 according to the EDS test.

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Abstract

The invention provides silicon oxide compound silver powder comprising silicon oxide and silver particles at the mass ratio of (1.8-3):100, wherein silicon oxide is covered on the surfaces of the silver particles, the average particle diameter of silicon oxide is 40-200nm, and the average particle diameter of the silver particles is 1.3-4.0mu m. The invention also provides a preparation method for the silicon oxide compound silver powder and conductive silver paste containing the silicon oxide compound silver powder. The silicon oxide compound silver powder provided by the invention has the characteristic that silicon oxide is covered on the surfaces of the silver particles, so that the silver powder has better dispersing property; and the conductive silver paste containing the silicon oxide compound silver powder has better electrical conductivity.

Description

technical field [0001] The invention relates to a silicon oxide composite silver powder, a preparation method thereof and a conductive silver paste. Background technique [0002] Silver powder and aluminum powder used in the electronic paste industry generally have higher requirements on dispersibility and tap density. At present, silver powder products are mainly divided into two categories: spherical silver powder and flake silver powder. Spherical silver powder is mainly obtained by chemical reduction. Generally, silver nitrate or other soluble silver salt solution and reducing agent solution are mixed for reduction reaction to precipitate silver powder particles. ; Flake silver powder is usually obtained by mechanical processing of spherical silver powder such as ball milling. However, due to the small size of silver powder particles, high activity, and easy agglomeration between particles, the dispersion of silver powder in electronic paste is poor. In addition, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/02H01B1/22H01B13/00
Inventor 张斌彭长春周维
Owner 深圳市新合富力科技有限公司
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