Method for preparing aluminium powder with high tap density

Abstract

The invention discloses a method for preparing aluminum powder with high tap density, which comprises the following steps: dissolving 100 weight parts of silver nitrate and one weight part of hydrogen nitrite in deionized water to form 30 to 60 percent silver nitrate solution; dissolving 60 weight parts of sodium carbonate in deionized water to form 5 to 25 percent sodium carbonate solution; adding the silver nitrate solution into the sodium carbonate solution under the condition of continuous stirring to prepare a precursor silver carbonate system, wherein the mixture is alkalescent; keeping the temperature of the precursor silver carbonate system at 15-25 DEG C, quickly adding a formidable reductant to complete the reduction reaction under the condition of continuous stirring; washing the obtained product for 15-20 times by using deionized water after reaction, and then filtering the deionized water, and drying to consequently obtain the required silver powder. Compared with the conventional vacuum atomization method, the invention has the advantages of low cost and simple operation.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a method for preparing silver powder with high bulk density. Background technique [0002] Due to its high conductivity and low cost, silver powder has more and more important applications in the field of electronic information industry, such as fillers for conductive rubber, electronic pastes, conductive inks, shielding coatings, etc. [0003] The hole-filling conductive paste used in the electronic information industry now does not shrink during the sintering process, so the paste is required to have no sintering shrinkage during use, and most of the types of paste used now are due to In the high-temperature sintering stage, there is a powder metallization process, so after sintering, there will be shrinkage. In order to control this phenomenon, the best way is to use high-density silver powder. [0004] At present, the methods commonly used in the pre...

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Problems solved by technology

[0004] At present, the commonly used methods for preparing high bulk density silver powder at home and abroad are physical methods such as vacuum atomization method. Because the whole set of production equipment of vacuum atomization method is expensive and the cost is relatively high, it is not conducive to the promotion of industrialization. Therefore, a suitable method is sought. It is very necessary to prepare silver powder with high bulk density by chemical method with low cost and easy operation.