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Preparation method for leaf-shaped silver powder

A leaf-shaped, silver powder technology is applied in the field of silver powder preparation, can solve problems such as no known preparation method, and achieve the effect of simple preparation method

Active Publication Date: 2016-02-24
LIYANG LIFANG PRECIOUS METALS MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Leaf-shaped silver powder is a kind of flake silver powder, and there is no preparation method report at present

Method used

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  • Preparation method for leaf-shaped silver powder
  • Preparation method for leaf-shaped silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0027] The preparation method of the leaf-shaped silver powder of the present embodiment may further comprise the steps:

[0028] ① Silver nitrate solution is now prepared, the concentration of silver nitrate in the solution is 2.4mol / L ~ 3.0mol / L; the preparation method of silver nitrate solution can be to dissolve metallic silver in excess nitric acid, and the concentration of nitric acid used is 20% ~ 40% %, to obtain a silver nitrate solution of the above concentration; or to obtain a solution of the above concentration after dissolving silver nitrate crystals in nitric acid.

[0029] The concentration of the silver nitrate solution configured in this embodiment is 2.6 mol / L.

[0030] ② Add the hydrazine hydrate aqueous solution with a concentration of 80% to the silver nitrate solution prepared in step ①, mix evenly to obtain a mixed solution, and react the mixed solution at 60°C-90°C for 15-30min, and the reduction of silver nitrate after the reduction reaction is comple...

Embodiment 2）

[0039] All the other are identical with embodiment 1 of the preparation method of the leaf shape silver powder of the present embodiment, difference is:

[0040] The concentration of the hydrazine hydrate aqueous solution used in the step 2. is 60%; the ratio of the amount of hydrazine hydrate and silver nitrate in the mixed solution obtained after the hydrazine hydrate aqueous solution and the silver nitrate solution are uniformly mixed is 1:3.

[0041] The specific surface area of ​​the gained silver powder is 0.4m 2 / g, the particle size D(10) is 4μm, the particle size D(50) is 15μm, the particle size D(90) is 27μm, and the bulk density is 1.00g / cm 3 , the tap density is 2.1g / cm 3 .

[0042] After stirring evenly at a low speed in step ③, set the speed of ball milling at 150rpm for 5 hours.

[0043] See figure 2 , The appearance of the silver powder after ball milling in the present embodiment is leaf-like, and the purity is more than 99.9%. The specific surface area ...

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Abstract

The invention discloses a preparation method for leaf-shaped silver powder. Silver nitrate is subjected to reduction by hydrazine hydrate to be silver powder, then the silver powder obtained after reduction is washed and dried, then the silver powder is subjected to ball-milling in a ball mill by controlling the ball-milling time and ball-milling dispersing agents, and the silver in a leaf shape is obtained through separation and drying after ball-milling is finished. The preparation method for the leaf-shaped silver powder is simple; crystal-type leading agents or crystal-type conditioning agents do not need to be added when the silver powder is subjected to reduction, preparation of ultra-fine copper powder in advance is not needed either, and therefore industrial large-scale production is achieved easily. The prepared leaf-shaped silver powder is applicable to silver contact production of alloys for electrical equipment.

Description

technical field [0001] The invention relates to a preparation method of silver powder, in particular to a preparation method of leaf-shaped silver powder suitable for preparing electrical alloy contacts. Background technique [0002] In addition to high purity and good dispersion, the silver powder in the electronics industry also has special requirements for its shape. The performance of powders of different shapes will vary greatly under the same use environment. Flake silver powder is widely used in electronic components such as carbon film potentiometers, capacitors, membrane switches, and semiconductor chip bonding. Flake silver powder is an important component of electrode paste for surface mount components. [0003] Flake silver powder refers to flake powder with one-dimensional thickness less than 100nm. Compared with spherical silver powder, flake silver powder has the following advantages: 1. Good electrical conductivity, the shape of silver particles is closely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F9/04
Inventor 王自伟尚通明刘维桥魏成文何沁华
Owner LIYANG LIFANG PRECIOUS METALS MATERIAL CO LTD