Micrometer silver-copper granule containing nano level surface structure and preparation and application thereof
A technology of surface structure and micron silver, which is applied in the field of micron silver-copper particles and its preparation, can solve problems such as inability to sinter filler particles, achieve stable and reliable product performance, easy process flow, and reduce surface sintering or melting temperature.
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[0023] Example 1
[0024] At room temperature, 1 kg of flake sterling silver powder (99.5%) with an average particle size of 30 microns and 2 g (0.5%) of 3,4-dihydroxyphenylpropionic acid were used. Stir in 10 liters of ethanol solution at 100 rpm for 30 minutes, then add 17 g of silver nitrate and 4 g of sodium borohydride; continue to stir at 100 rpm for 60 minutes. The silver powder is filtered out, the powder liquid is removed from the solvent by a centrifuge at 500 rpm, and the excess solvent is removed by a vacuum pump to obtain a micron flake silver powder with a nano-surface structure.
[0025] As shown in FIG. 1 , the tiny particles displayed on the surface of the micron silver powder are nanometer silver powders produced by this process.
Example Embodiment
[0026] Example 2
[0027] At room temperature, 20 kg of flake silver-coated copper powder with an average particle size of 24 microns (the mass ratio of silver: copper is 5:5) was stirred in 200 liters of ethanol solution for 30 minutes. Then add 560 grams of silver chloride powder and 780 grams of citric acid; continue to stir for 120 minutes at a speed of 100 rpm. The powder solution is filtered through filter paper and drained to obtain micron flake silver-coated copper powder with nanometer surface structure.
Example Embodiment
[0028] Example 3
[0029] At room temperature, 5 kg of flake pure silver powder (99.5%) with an average particle size of 30 microns was dispersed in 50 liters of ethanol solution, stirred for 30 minutes, and 500 ml of ethanol solution containing 22 grams of acetaldehyde and 85 grams of nitric acid were added dropwise. Ag solution in 500 ml of ethanol and continued stirring at 100 rpm for 120 minutes. The powder solution is filtered through filter paper and drained to obtain micron flake silver powder with nanometer surface structure.
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