SPHERICAL SILVER POWDER AND PREPARATION METHOD THEREFOR, AND CONDUCTIVE PASTE

• Main Authors: XIA, Xiaotian, LIAO, Yunhong
• Format: Patent
• Language: Chinese; English; French
• Published: 21.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CASTING; CONDUCTORS; ELECTRICITY; INSULATORS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; TRANSPORTING; WORKING METALLIC POWDER

A preparation method for spherical silver powder, comprising: performing a reduction reaction: performing a reduction reaction on inorganic silver salt, a reducing agent, an organic silver colloid and a dispersion liquid comprising a dispersing agent; and wrapping silver powder: adding a wrapping agent into the solution subjected to the reduction reaction, so as to obtain spherical silver powder. Also provided is silver powder, wherein the D50 of the silver powder is 0.5-2.0 μm, and the specific surface area of the silver powder is 0.2-1.0 m2/g. Further provided is a conductive paste comprising the silver powder. The silver powder prepared by means of the method is stable in key indexes such as particle size distribution and specific surface area; by adjusting the dosage of organic silver, the key indexes such as particle size distribution and specific surface area of the silver powder can be flexibly adjusted, so that the diversification of a silver powder product is achieved. Procédé de préparation de poudr