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
CN102672168BInactive Publication Date: 2015-01-14HENAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HENAN UNIV OF SCI & TECH
Publication Date
2015-01-14
Estimated Expiration
Not applicable · inactive patent

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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.
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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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