Method for preparing high-fluidity micron silver particles and device

Abstract

The invention discloses a method for preparing high-fluidity micron silver particles, and belongs to the technical field of powder materials. The preparation method can effectively solve the problem of crystal grain agglomeration of the silver powder in a liquid phase reaction in a traditional preparation method, and meanwhile, the solution can be mixed without stirring before the liquid phase reaction, so that the defect that larger crystal particles cannot be formed is avoided; and a dispersing agent in a traditional liquid phase reaction is replaced by a flow aid, the problem of subsequent silver powder cleaning residues is effectively avoided, the effects of dispersing the silver powder and improving the particle surface property are achieved, meanwhile, gas in silver particles can be preferentially adsorbed, and the finally prepared product is high in tap density and high in fluidity. The invention further discloses a dot screen type dispersing device for preparing the high-fluidity micron particles, the device can effectively and synchronously add a shaped silver source solution and a reducing agent solution into a flow aid solution, the uniformity of the mixed solution is improved, and the problem of crystal grain agglomeration of the silver particles is solved.

Description

technical field [0001] The invention relates to the technical field of powder materials, in particular to a method and device for preparing highly fluid micron silver particles. Background technique [0002] In the prior art, the principle of preparing silver powder by the liquid phase reduction method is to use a reducing agent to deposit silver from silver salts, silver complex aqueous solutions or organic systems in powder form. This method has the following advantages: low equipment requirements, low preparation costs Low, the shape and particle size of silver powder can be easily controlled by adjusting process parameters such as temperature, reaction time, and reactant dosage during the reaction process, and the process is simple. The liquid phase reduction method is widely used in the field of electronics industry, but the silver powder prepared by the chemical reduction method is prone to agglomeration, and the pH value and reaction temperature will affect the reacti...

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Problems solved by technology

[0003] Based on the defects existing in the prior art, the purpose of the present invention is to provide a preparation method of highly fluid micron silver particles, the silver powder prepared by the preparation method can realize close packing in the vibration process and can be used to solve the problem of preparing silver powder in the prior art. There is a large number of pores after sintering to form a film; the preparation method can effectively solve the problem of silver powder crystal grain agglomeration, and at the same time avoid the residual problem of silver powder cleaning process after liquid phase reaction, which is efficient and simple

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