Composite nano silver paste and rapid sintering packaging method
A technology of rapid sintering and encapsulation method, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of shortened device life, volume shrinkage, high cost, short heating time and reduced volume Shrinkage and the effect of little thermal influence
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Embodiment 1
[0028] Embodiment 1 A kind of composite nano-silver paste and rapid sintering packaging method, comprising:
[0029] (1) Mixing nano-silver particles with an average particle diameter of 50 nm and surface-coated polyvinylpyrrolidone into ethylene glycol to obtain a nano-silver paste.
[0030] (2) Glutaric acid and terpineol are dissolved in ethylene glycol, and mixed with nano-silver slurry, fully mechanically stirred and ultrasonically dispersed to obtain a composite nano-silver paste, wherein the total mass percentage of nano-silver particles is 74.7% , the mass percentage of glutaric acid is 0.3%, and the mass percentage of terpineol is 5%.
[0031] (3) Apply the obtained nano-silver paste on the surface of the copper substrate by dispensing, and align and stack to form a packaging structure.
[0032] (4) Use pulse thermocompression welding to heat and apply pressure to the area that needs to be interconnected. The heating temperature is 300°C, the heating time is 40s, and...
Embodiment 2
[0034] Embodiment 2 A composite nano-silver paste and a rapid sintering packaging method, comprising:
[0035] (1) Use 2.5% formic acid to clean micron silver flakes with an average of 2-5 μm, and use ethanol solution to wash and centrifuge several times to obtain clean micron silver flakes;
[0036] (2) Mix the nano-silver particles with an average of 50nm and a sodium citrate coating layer on the surface with the micro-silver flakes, and add a mixed solution of ethanol and ethylene glycol with a mass ratio of 1:4 to obtain a nano-silver paste , wherein the solid content of micron silver flakes is 20%.
[0037] (3) Dissolve abietic acid and polyvinyl alcohol into a mixed solution of ethanol and ethylene glycol with a mass ratio of 1:4, and mix them with nano-silver paste. After fully ultrasonically dispersed, use a planetary gravity stirrer to stir to obtain a composite Nano silver paste, wherein the total mass percentage of micron silver flakes and nano silver particles is ...
Embodiment 3
[0041] Embodiment 3 A kind of composite nano-silver paste and fast sintering packaging method, comprising:
[0042] (1) use the formic acid alcohol solution that is 2% by mass percent to clean the micron silver flakes with an average of 500nm, and use ethanol solution to wash and centrifuge several times to obtain clean micron silver flakes;
[0043] (2) Mix the nano-silver particles with an average of 13nm and a sodium citrate coating on the surface with the micro-silver flakes, and mix into a mixed solution of ethanol and propylene glycol with a mass ratio of 1:4 to obtain a nano-silver paste, wherein the micro-silver The solids content of the tablet was 10%.
[0044] (3) Dissolve abietic acid and ethyl cellulose into a mixed solution of ethanol and propylene glycol with a mass ratio of 1:4, mix with nano-silver paste, ultrasonically disperse and stir with a planetary gravity stirrer to obtain a composite nano-silver In the silver paste, the total mass percentage of micron ...
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