Silver-nickel alloy powder and preparation method thereof and conductive slurry including silver-nickel alloy powder

Abstract

The invention discloses silver-nickel alloy powder. The particle size of nickel particles ranges from 0.1 micrometer to 5.0 micrometers, and silver accounts for 0% to 60% of the total weight of silverparticles and the nickel particles. A method for preparing the silver-nickel alloy powder comprises the steps that a reducing agent I is used firstly, the silver particles are primarily separated outon the surfaces of the nickel particles, and therefore a precursor is prepared; and then the precursor is in full contact with a dispersing agent, a complexing agent, the silver particles and a reducing agent II of the silver particles in deionized water, and therefore silver is further replaced and separated out on the surface of the precursor. A silver coating layer on the surfaces of the silver particles and the nickel particles prepared through the method is high in density and has fewer holes, and therefore surface oxidization of the nickel particles and resistance reduction of the silver-nickel alloy powder can be controlled well, it is guaranteed that the conductive performance of the silver-nickel alloy powder after long-time storage is still good, and the silver-nickel alloy powder can be applied to conductive slurry.

Description

technical field [0001] The invention relates to the fields of electronic functional materials and metal powder materials, in particular to silver-coated nickel alloy powder and a manufacturing method thereof. Background technique [0002] The conductive fillers used for conductive coatings and conductive pastes include silver, palladium, gold and other precious metals. Among them, silver powder has the best conductivity, and the price of silver powder is much lower than that of palladium powder and gold powder. The scope of use in the industry is relatively wide. Although silver powder is an important raw material widely used in the electronics industry, as the price of silver soars, the cost of many electronic components also rises rapidly, so we need to consider how to reduce the use of precious metals from the perspective of production costs , so it is necessary to find a powder that can replace silver powder and is relatively cheap. Metal nickel powder has good electri...

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Problems solved by technology

For example, there are literatures that have proposed a method for preparing conductive powder coated with a silver layer on the surface of nickel powder, specifically mixing a complex solution of silver ions with a slurry containing nickel powder, a complexing agent and a dispersant to form a suspoemulsion , the silver ions are evenly precipitated on the surface of the nickel powder by stirring. This method uses the displacement reaction to precipitate the silver ions to coat the surface of the nickel powder. However, the surface coating of the powder prepared by this reaction has a high porosity and the coating is not dense.

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