A kind of micro-nano mixed solder paste that can be used for pressureless sintering and its preparation method
A hybrid welding, micro-nano technology, applied in the direction of welding equipment, manufacturing tools, welding media, etc., can solve the problems of obvious volume shrinkage, low stacking density, high production cost, etc., to achieve increased stacking density, smooth particle surface, and equipment simple effect
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Embodiment 1
[0037] Embodiment 1 A preparation method of a micro-nano hybrid solder paste that can be used for pressureless sintering, comprising:
[0038] (S1) using the formic acid alcohol solution with a volume fraction of 5% to clean the micron copper particles with an average particle size of 500 nm, and then performing centrifugation and drying to obtain clean micron copper particles on the surface;
[0039] (S2) mechanically mixing the micron silver particles with succinic acid, terpineol, ethanol and ethylene glycol to obtain a mixture A, wherein the mass percentage of micron copper is 80%, the mass percentage of succinic acid is 0.5%, terpineol is The mass percentage of ethanol is 4.5%, the mass percentage of ethanol is 5%, and the rest are ethylene glycol;
[0040] (S3) be 70nm and be coated with the nano-silver particles of sodium citrate and gelatin, terpineol, ethanol and ethylene glycol mechanically mix, obtain mixture B, wherein nano-silver mass percentage is 80%, and gelati...
Embodiment 2
[0042] Embodiment 2 A preparation method of a micro-nano hybrid solder paste that can be used for pressureless sintering, comprising:
[0043] (S1) using the dilute nitric acid alcohol solution that volume fraction is 5% to clean the micron silver particles with an average particle size of 1 μm, and then carry out centrifugation and drying treatment to obtain the micron silver particles with clean surface;
[0044] (S2) mechanically mixing micron silver particles with glutaric acid, ethyl cellulose, butanol and ethylene glycol to obtain mixture A, wherein the mass percentage of micron silver is 84%, the mass percentage of glutaric acid is 0.5%, and the pine oil The mass percentage of alcohol is 3.5%, the mass percentage of butanol is 7%, and the rest are ethylene glycol;
[0045] (S3) be 50nm and be coated with the nano silver particles of sodium citrate and fish oil, ethyl cellulose, butanol and ethylene glycol mechanically mix, obtain mixture B, wherein nano silver mass perc...
Embodiment 3
[0047] Embodiment 3 A preparation method of micro-nano hybrid solder paste that can be used for pressureless sintering, comprising:
[0048] (S1) will use the dilute hydrochloric acid alcohol solution that volume fraction is 5% to clean the micron silver particles that the average particle size is 3 μm, and then carry out centrifugation and drying treatment to obtain the micron silver particles that the surface is clean;
[0049] (S2) mechanically mixing micron silver particles with rosin acid, butyl carbitol acetate, butanol and propylene glycol to obtain mixture A, wherein the mass percentage of micron silver is 70%, the mass percentage of rosin acid is 0.2%, and the mass percentage of butyl carbitol is 0.2%. The mass percentage of bisphenol acetate is 3.4%, the mass percentage of butanol is 9%, and the rest is ethylene glycol;
[0050] (S3) the nano-silver particles with an average particle size of 20nm and coated with sodium citrate are mechanically mixed with sodium dodec...
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