Production method of silver coated nickel powder

Abstract

The invention discloses a production method of silver coated nickel powder. The method comprises three main steps of surface preprocessing, plating and surface post-processing to prepare the nickel powder, wherein the preprocessing include washing and surface modifying of the nickel powder; the plating is performed by a chemical plating method using a silver-ammonia solution; the nickel powder isactivated through a surfactant containing water solution and is subjected to surface modification before silver plating, so that the nickel powder is easily plated; a complexing agent is added to a reduction solution in the plating process so as to decrease the deposition speed of silver atoms, and the nickel powder can be coated with the silver atoms; after plating, the surface is further processed through a thermal processing method in order to repair few coating defects in the silver plating link by a reductive thermal treatment technology, and thus the coating density is improved; and meanwhile, the processes are environmentally friendly, and easily operated; and industrial massive production is realized. The silver coated nickel powder prepared by the method is uniform and dense in ametal plating layer, free from exposed pores, and high in electricity conductivity while being used in an electrical material.

Description

technical field [0001] The invention belongs to the field of electronic functional materials and metal powder materials, in particular to a method for preparing a metal-coated powder, more specifically, a production of silver-coated nickel powder coated and densely applied to medium-high temperature electronic paste method. Background technique [0002] With the rapid development of the modern electronics industry, the number of various commercial and household electronic products has increased dramatically. The miniaturization, integration, light weight, and digitization of electronic circuits and components have caused electronic products in daily use to be susceptible to electromagnetic interference and cause malfunctions and image disturbances. At the same time, these electronic products themselves also emit electromagnetic waves, thus forming a public hazard problem of electromagnetic waves. At present, to solve the electromagnetic wave interference and shielding prob...

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Problems solved by technology

[0003] Chinese patent CN 1416986 discloses a production method of a high-temperature-resistant and anti-oxidation base silver-coated nickel powder composition. The nickel powder of the invention uses cleaning, activation, and sensitization before plating, and the process is relatively complicated and the cost is high; and silver plating During the process, it is easy to produce nickel ammonium ions to wrap on the nickel powder particles, hindering the deposition of silver atoms, and the coating is loose and not dense.

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