Preparation method of silver coated copper powder for electronic slurry
A technology of silver-coated copper powder and electronic paste, applied in the direction of coating, etc., can solve the problems of complex process steps, complex raw material components, easy deposition of silver layer, etc., and achieve simple process steps, high oxidation resistance, and raw material composition simple effect
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[0022] Example 1:
[0023] Weigh 10 grams of 500nm spherical copper powder raw material, add it into the reaction vessel, then add 200 ml of nitric acid with a mass concentration of 5%, ultrasonically stir for 5 minutes to remove oxides on the surface of the copper powder raw material, then filter and collect the filter residue, and use distilled water to clean the filter residue. 3 times to get the copper powder after pickling. Weigh 12 grams of EDTA and add it to 400 ml of deionized water to form a complex solution, then add the acid-washed copper powder into the complex solution, and stir evenly to obtain a reducing solution. Weigh 3 grams of silver nitrate into 150 ml of deionized water, then add 3 ml of ammonia water with a mass concentration of 28%, and stir to obtain a transparent silver ammonia solution. Under the dispersion and stirring of an ultrasonic disperser with a power of 500W, the silver ammonia solution was added to the reducing solution at a dropping rate o...
Example Embodiment
[0024] Example 2:
[0025] Weigh 52 grams of 800nm spherical copper powder raw material, add it to the reaction vessel, then add 200 ml of sulfuric acid with a mass concentration of 5%, ultrasonically stir for 10 min to remove oxides on the surface of the copper powder raw material, then filter and collect the filter residue, and use distilled water to clean the filter residue. 3 times to get the copper powder after pickling. Weigh 74.43 grams of EDTA-2Na into 2000 ml of deionized water to form a complex solution, then add the acid-washed copper powder into the complex solution, and stir evenly to obtain a reducing solution. Weigh 31.4 grams of silver nitrate and add it to 600 milliliters of deionized water, then add 42.9 milliliters of ammonia water with a mass concentration of 25%, and stir to obtain a transparent silver ammonia solution. Under the dispersion and stirring of an ultrasonic disperser with a power of 300W, the silver ammonia solution was added to the reducin...
Example Embodiment
[0026] Example 3:
[0027] Weigh 100 grams of 3um flake copper powder raw material, add it to the reaction vessel, then add 400 ml of formic acid with a mass concentration of 8%, ultrasonically stir for 15 min to remove oxides on the surface of the copper powder raw material, then filter and collect the filter residue, and the filter residue is subjected to distilled water. Wash 3 times to get pickled copper powder. Weigh 68.89 grams of EDTA and add it to 4000 ml of deionized water to form a complex solution, then add the acid-washed copper powder into the complex solution, and stir evenly to obtain a reducing solution. Weigh 33.05 g of silver nitrate and add it to 600 ml of deionized water, then add 45.1 ml of ammonia water with a mass concentration of 25%, and stir to obtain a transparent silver ammonia solution. Under the dispersion and stirring of an ultrasonic disperser with a power of 300W, the silver ammonia solution was added to the reducing solution at a dropping rat...
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