Method capable of continuously preparing micron-sized spherical gold powder

Abstract

The invention provides a method capable of continuously preparing micron-sized spherical gold powder with uniform particle size. According to the method, a rapid rotation nucleation method capable of effectively reducing interference of the external environment on gold grain nucleation is adopted, the gold-containing mother liquor and a reducing agent are introduced into a rapid rotation nucleation reactor at the same time, mass transfer reaction is rapidly completed in micro-nano liquid drops generated through high-speed rotation cutting, a huge amount of uniform crystal nuclei are formed, then the crystal nuclei are introduced into a rear reactor, and the gold-containing mother liquor is obtained. And the controllable growth of the spherical gold powder crystal grains is continuously completed until the spherical gold powder particles in the micron-sized particle size range are obtained, then the obtained micron-sized spherical gold powder precipitate is washed and dried, and the spherical gold powder with the uniform particle size can be obtained. The spherical gold powder which is high in purity, good in dispersity, smooth in surface and more uniform in particle size distribution compared with a common liquid phase reduction method can be continuously prepared through the method, and the average particle size D50 of the spherical gold powder ranges from 1 micrometer to 3 micrometers.

Description

technical field

[0001] The invention relates to the technical field of functional materials, in particular to a method for continuously preparing micron-sized spherical gold powder for electronic paste. Background technique

[0002] With the rapid development of advanced manufacturing industries such as 5G communications, radar electronics, and smart cars in the electronic information industry, the market is increasingly interested in electronic components such as hybrid multi-chip modules (MCM-C / D), microwave hybrid integrated circuits, and high-power micro-assembled chips. Demand has also exploded. Since gold has electrical conductivity second only to silver and copper, excellent corrosion resistance and oxidation resistance, and gold usually has no electromigration, these points jointly determine the preparation of high-frequency, high-frequency, high-frequency, Due to the inherent advantages of low-loss and long-life electronic components, gold conductor paste has becom...

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