Abstract
In recent years, ultrafine copper powder has become one of the most promising industrial materials due to its unique physical and chemical properties. For example, the high electrical conductivity of the powder allows to use it as a conductive paste or screen for protection against electromagnetic waves. JSC Uralelectromed is a unique enterprise in Russia with multi-tonnage production of copper electrolytic powder. The particle size of the powders varies depending on the brand in a wide range — from 5 to 250 microns. It is necessary to obtain ultrafine copper powder with an average particle size of 3 to 6 μm. The literature review showed the possibility to obtain ultrapowders by chemical methods and electrolysis from various media. However, the above examples of obtaining ultrafine copper powder differ significantly from the JSC Uralelectromed technology. Therefore, laboratory experiments were performed to optimize the existing electrolysis mode and determine the effect of the electrolyte components concentration and cathode current density on the process of obtaining a powder with a high content of fractions up to 5 μm. Regression equations were compiled, which showed the predominant effect of chloride ions and sulfuric acid, whose growth results in increase in the content of the required fraction. Industrial tests, in addition to the modified electrolysis step, included experiments on the separation of the powder on an air-centrifugal classifier. The range of the optimal specific surface and the average particle size of the initial (before classification) powder was determined. The modes of operation of the air classifier to obtain the required fractional composition of the powder were also determined. The specific surface area of the obtained ultrapowders ranged from 4400 to 5600 cm2/g.
Published Version
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