Nano-silver powder, manufacturing method and application thereof

A technology of nano silver powder and manufacturing method, applied in cable/conductor manufacturing, metal/alloy conductors, electrical components and other directions, can solve the problems of small electrode coverage, silver electrode erosion, etc., and achieve improved solder resistance, large specific surface area, The effect of improving electrode coverage

Active Publication Date: 2010-05-12
GRIKIN ADVANCED MATERIALS
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AI-Extracted Technical Summary

Problems solved by technology

The electrode coverage is small, and the silver electrode is easily eroded by the S...
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Abstract

The invention relates to nano-silver powder used for DC electrode sizing agents and low-temperature bonding nano-silver paste, and a manufacturing method thereof. The physical properties of nano-silver powder are as follows: particle size distribution between 10 and 100 mu m, average particle size between 20 and 50 nm, specific surface area between 30 and 50 m2/g, and apparent density between 1.5 and 3.0 g/cm3. The nano-silver powder adopts a chemical reduction method and is prepared by adopting hydrazine hydrate, glycerine or triethanolamine to reduce silver compounds at 90 to 92 DEG C. The nano-silver powder manufactured by the method is applied to the DC electrode sizing agents sintered at 800 DEG C. When the nano-silver powder is applied to the nano-silver paste of SiC or GaN and other chips bonded at 260 to 270 DEG C, electrodes have the advantages of good weldability, high conductivity, stable electrical property, high bonding strength, high reliability and the like.

Application Domain

Fixed capacitor electrodesMetal/alloy conductors +1

Technology Topic

NanometreTriethanolamine +10

Examples

  • Experimental program(2)

Example Embodiment

[0048] Embodiment 1, a kind of nano silver powder (1kg), its production technique is as follows:
[0049] 1 Preparation of silver carbonate
[0050] Weigh 1575 grams of analytically pure silver nitrate (silver content of 1kg), modulate it into a silver nitrate solution with a molar concentration of 1.25mol/L with ion-exchanged water in a container, add dropwise anhydrous sodium carbonate solution, and adjust the pH value to 9~ 10. To obtain silver carbonate, use the siphon method to wash the silver carbonate to neutrality with ion-exchanged water.
[0051] 2 Preparation of reducing agent mixture
[0052] Measure 0.15L of hydrazine hydrate according to 0.1~1.2L/1kg silver, and measure 0.12L of 5wt% polyvinyl alcohol aqueous solution (containing 6.5g of polyvinyl alcohol) according to 5~15g/1kg silver, mix hydrazine hydrate and 5wt% polyvinyl alcohol The solution is stirred and mixed uniformly to obtain a mixed solution of reducing agent.
[0053] 3. Preparation of nano-silver powder by chemical reduction method
[0054] In the silver carbonate prepared in the step 1 of silver carbonate preparation, add the deionized water amount of 7.5L by the amount of silver nitrate raw material of every 1000 grams, add deionized water, and be prepared by the silver nitrate of 1575 grams to the amount of raw material Add 11.8L of deionized water to the silver carbonate to obtain a suspension, and heat it to 90-92°C; pour the reducing agent mixture obtained in step 2 of the reducing agent mixture preparation into the above suspension, Stir with a stirrer until the supernatant is clear as the reaction is over, and after filtration, nano-silver powder is obtained.
[0055] 4 nanometer silver powder washing and drying
[0056] The nano-silver powder obtained in step 3 of preparing the nano-silver powder by chemical reduction method is washed with ion-exchanged water to a pH value of 7, and the whole process is completed by drying at 80°C.
[0057] 5. Detect the properties of the dried nano-silver powder:
[0058] 1) Particle size range: 20~80nm
[0059] 2) Average particle size: 35nm
[0060] 3) Specific surface area: 31~38m 2 /g
[0061] 4) Loose packing density: 1.8cm 3 /g

Example Embodiment

[0062] Embodiment two, a kind of nanometer silver powder (1kg), its production technique is as follows:
[0063] 1 Silver oxide preparation
[0064] Weigh 1575 grams of analytically pure silver nitrate (silver content of 1kg), prepare a silver nitrate solution with a molar concentration of 2.2 mol/L with ion-exchanged water in the container, add sodium hydroxide alkali solution dropwise, and adjust the pH value to 9~ 10. The silver oxide is prepared, and the silver oxide is washed with ion-exchanged water by the siphon method to neutrality.
[0065] 2 Preparation of reducing agent mixture
[0066] Measure 1.0L of glycerol according to 0.1~1.2L/1kg silver, weigh 15g of rosin according to 5~20g/1kg silver (dissolve in ethanol), stir and mix the glycerol and rosin solution evenly to obtain a mixed solution of reducing agent .
[0067] 3. Preparation of nano-silver powder by chemical reduction method
[0068] In the silver oxide prepared in the step 1 of silver oxide preparation, add the amount of deionized water of 7.5L by the amount of silver nitrate raw material per 1000 grams, add deionized water, that is, the amount of raw material is 1575 grams of silver nitrate prepared by Add 11.8L of deionized water to the silver oxide silver to obtain a suspension, and heat it to 90-92 ° C; and pour the reducing agent mixture obtained in step 2 of the reducing agent mixture preparation into the above suspension. , stir with a stirrer, until the supernatant is clear, it is regarded as the end of the reaction, and the nano-silver powder is obtained after filtration.
[0069] 4 nanometer silver powder washing and drying
[0070] The nano-silver powder obtained in step 3 was washed with ion-exchanged water until the pH value was 7, and the whole process was completed by drying at 80°C.
[0071] 5. Detect the properties of the dried nano-silver powder:
[0072] 1) Particle size range: 10~60nm
[0073] 2) Average particle size: 30nm
[0074] 3) Specific surface area: 35~42m 2 /g
[0075] 4) Loose packing density: 2.1cm 3 /g.
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PUM

PropertyMeasurementUnit
Particle size distribution10.0 ~ 100.0nm
Average particle size20.0 ~ 50.0nm
Specific surface area30.0 ~ 50.0m²/g
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Large specific surface area
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