Nano-silver coated micron copper soldering paste and preparation method thereof
A technology of micron copper and silver-clad copper, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of high cost of nano-solder, harsh sintering conditions, complex sintering conditions, etc., to overcome the difficulty of storage and oxidation resistance Good, the effect of overcoming the high cost
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[0039] Example 1
[0040] The preparation of nano-silver-coated micro-copper solder paste includes the following steps:
[0041] (1) Put 5g of micron copper particles into a beaker, add 50ml of dilute nitric acid with a mass fraction of 5% for acidification, ultrasonically vibrate for 5min, use a high-speed centrifuge to carry out liquid-solid separation under the condition of 4000r / min, and the obtained copper particles are deionized Washed with water three times to obtain product A, that is, acidified micron copper particles.
[0042](2) put the product A obtained in step (1) into a beaker, add 300ml of deionized water, add 4g of ascorbic acid, 4g of polyvinylpyrrolidone (PVP), stir and dissolve by heating in a water bath at 40°C, dropwise the concentration of 0.3mol / L Silver nitrate solution 60mL, continue to stir during the dropwise addition, keep the stirring rate of 300r / min after the dropwise addition, continue to react in a 40℃ water bath for 1h, after the reaction is...
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[0045] Example 2
[0046] The preparation of nano-silver-coated micro-copper solder paste, the steps are as follows:
[0047] (1) Put 10g of micron copper particles into a beaker, acidify with 100ml of dilute sulfuric acid with a mass fraction of 8%, ultrasonically vibrate for 8min, use a high-speed centrifuge to carry out liquid-solid separation under the condition of 4000r / min, and the obtained copper particles are deionized The product A was obtained by washing with water three times.
[0048] (2) Put product A into a beaker, add 300ml of deionized water, add 6g of hydrazine hydrate, 2g of cetyltrimethylammonium bromide, heat in a water bath at 50°C, stir and dissolve, and dropwise add a concentration of 0.4mol / L. Silver nitrate solution 80mL, continue to stir during the dropwise addition, keep the stirring rate of 400r / min after the dropwise addition, and continue to react in a 50°C water bath for 2h. After the reaction is completed, use a high-speed centrifuge to conduct...
Example Embodiment
[0050] Example 3
[0051] The preparation of nano-silver-coated micro-copper solder paste includes the following steps:
[0052] (1) Put 15g of micron copper particles into a beaker, acidify with 150ml of dilute nitric acid with a mass fraction of 5%, ultrasonically vibrate for 10min, use a high-speed centrifuge to carry out liquid-solid separation under the condition of 4000r / min, and the obtained copper particles are deionized The product A was obtained by washing with water three times.
[0053] (2) Put product A into a beaker, add 300ml of deionized water, add 8g of sodium borohydride, 24g of PVP, heat at 70°C and stir to dissolve, dropwise add 1100mL of silver nitrate solution with a concentration of 1mol / L, and continue during the dropping process. Stir, keep the stirring rate of 500r / min after the dropwise addition is completed, and continue to react in a 70°C water bath for 3h. After the reaction is completed, use a high-speed centrifuge to carry out liquid-solid sepa...
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