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Preparation method for core-shell structural nickel-silver bimetallic powder

A technology of metal powder and shell structure, applied in the direction of coating, etc., can solve the problems of unfavorable product performance stability and production cost, reduction, complicated process, etc., and achieve the effect that is beneficial to product performance

Inactive Publication Date: 2012-09-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is complex in process and requires multiple washings and filtrations, which is not conducive to the stability of product performance and the reduction of production costs.

Method used

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  • Preparation method for core-shell structural nickel-silver bimetallic powder
  • Preparation method for core-shell structural nickel-silver bimetallic powder
  • Preparation method for core-shell structural nickel-silver bimetallic powder

Examples

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Embodiment 1

[0023] The preparation method of the core-shell structure nickel-silver bimetallic powder in this embodiment comprises the following steps:

[0024] (1) Add 25g of nickel powder and 8.33g of dispersant PVP into 1L of ethanol-water mixed solvent, then place it in a water bath, keep the temperature of the water bath at 50°C, stir for 1 hour at a stirring speed of 500rpm, and obtain a nickel powder dispersion Solution, wherein the nickel powder is composed of spherical nickel particles with an average particle diameter of 1.0 μm, and the volume ratio of ethanol and water in the ethanol-water mixed solvent is: ethanol: water=2: 5;

[0025] (2) mixing the reducing agent hydrazine hydrate with water to obtain a hydrazine hydrate aqueous solution with a hydrazine hydrate concentration of 2.5mol / L, adjusting the pH value of the hydrazine hydrate aqueous solution to 11 to obtain a reducing agent solution;

[0026] (3) Nickel powder dispersion solution and reducing agent solution are mi...

Embodiment 2

[0033] The preparation method of the core-shell structure nickel-silver bimetallic powder in this embodiment comprises the following steps:

[0034] (1) Add 25g of nickel powder and 8.33g of dispersant sodium tartrate into 1L of ethanol-water mixed solvent, then place it in a water bath, keep the temperature of the water bath at 50°C, stir for 1 hour, and the stirring speed is 500rpm to obtain nickel powder Dispersion solution, wherein the nickel powder is composed of spherical nickel particles with an average particle diameter of 1.0 μm, and the volume ratio of ethanol and water in the ethanol-water mixed solvent is: ethanol: water=2:5;

[0035] (2) mixing the reducing agent hydrazine hydrate with water to obtain a hydrazine hydrate aqueous solution with a hydrazine hydrate concentration of 2.5 mol / L, and adjusting the pH value of the hydrazine hydrate aqueous solution to 12 to obtain a reducing agent solution;

[0036] (3) Nickel powder dispersion solution and reducing agent s...

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Abstract

The invention relates to the technical field of the preparation of metal powder materials and particularly discloses a preparation method for core-shell structural nickel-silver bimetallic powder. The preparation method comprises the following steps of: adding nickel powder and a dispersing agent in an ethanol-water mixed solvent, and stirring to obtain a nickel powder dispersing solution; preparing hydrazine hydrate solution with the hydrazine hydrate concentration of 2.5 mol / L, and adjusting the pH value of the hydrazine hydrate solution to more than 10 to obtain a reducing agent solution; mixing the nickel powder dispersing solution with the reducing agent solution to obtain a reaction solution A; dropwise adding an ammonia-silver solution in the reaction solution A and reacting for 70-100 minutes to obtain turbid liquid; performing centrifugal separation, washing and vacuum-drying the obtained solid to obtain the core-shell structural nickel-silver bimetallic powder. The preparation method provided by the invention has simple process; the obtained core-shell structural nickel-silver bimetallic powder has the advantages of controllable thickness of a silver coating layer, narrow distribution of grain diameter, good dispersing property and high vibrating density.

Description

technical field [0001] The invention relates to the technical field of metal powder material preparation, in particular to a method for preparing a core-shell structure nickel-silver bimetallic powder. Background technique [0002] Metal powder is an important raw material, which can be directly dispersed and used, or it can be pressed and sintered into bulk materials, and can also be made into film materials, etc. Taking the modern electronics industry as an example, Multilayer ceramic capacitors (MLCC for short) have become mainstream products in the capacitor industry and are widely used in communication, computer and consumer electronics products. One of the main development directions of MLCC is the base metallization of electrodes, that is, the use of low-priced base metals to replace expensive palladium, silver and other precious metals to reduce costs. After base metallization, the internal electrodes can save 2 to 5 times the cost. Nickel is cheap and easy to obtai...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24
Inventor 徐锐陈权杜西刚姚大虎吴峰敏许爱荣
Owner HENAN UNIV OF SCI & TECH
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