Preparation method of silver-coated copper composite powders
A composite powder, silver-coated copper technology, applied in the direction of coating, etc., can solve the problems of deposition on the inner wall of the plating tank, many times of plating, waste of silver on the silver layer, etc., achieve high conductivity, reduce costs, and strong oxidation resistance performance effect
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Embodiment 1
[0021] Take 40g of copper powder, add 6% dilute sulfuric acid to activate the oxide on the surface of the copper powder, and wash with ultrapure water for 3 times. Add 10g / LSnCl to the washed copper powder after activation 2 Sensitized in hydrochloric acid solution, stirred at room temperature for 2 hours, washed with pure water 3 times for use. Take 1000ml of 100g / L silver nitrate and ammonia water 100g / L. Preparation of mixed reducing solution: 68.5g of L-ascorbic acid and 6.7g of polyvinylpyrrolidone were prepared with ultrapure water, and treated copper powder was added, and stirred for 40 minutes. Then, mix the above-mentioned mixed reducing solution and silver ammonia solution under high-speed stirring, control the reaction temperature at 25° C., and the reaction time is 10 minutes. Finally, the precipitate was washed three times with ultrapure water, and then washed once with absolute alcohol, and finally dried in a blast drying oven at 50° C. for 24 hours, and pulver...
Embodiment 2
[0023] Take 30g of copper powder, add 8% dilute sulfuric acid for activation to remove oxides on the surface of the copper powder, and wash with pure water twice. Add 6g / LSnCl to the washed copper powder after activation 2 Sensitized in hydrochloric acid solution, stirred at room temperature for 1.5 hours, washed with pure water 3 times for use. Get the silver nitrate of 1000ml120g / L, ammoniacal liquor 130g / L. Preparation of mixed reducing solution: 77.6g of L-ascorbic acid and 8.1g of ammonium stearate were prepared with ultrapure water, and treated copper powder was added, and stirred for 50 minutes. Then, the above-mentioned mixed reducing solution and silver ammonia solution were mixed under high-speed stirring, the reaction temperature was controlled at 20° C., and the reaction time was 15 minutes. After the reaction was settled for 1 hour, the supernatant was poured out to obtain the precipitate. Finally, the precipitate was washed three times with ultrapure water, and...
Embodiment 3
[0025] Take 25g of copper powder, add 5% dilute sulfuric acid for activation to remove oxides on the surface of the copper powder, and wash with pure water twice. Add 5g / LSnCl to the washed copper powder after activation 2 Sensitized in hydrochloric acid solution, stirred at room temperature for 1 hour, washed with pure water 3 times for use. Get the silver nitrate of 1000ml130g / L, ammoniacal liquor 140g / L. Preparation of mixed reducing solution: L-ascorbic acid 82.5g, gelatin 9.5g were prepared with ultrapure water, and treated copper powder was added, and stirred for 45 minutes. Then, mix the above-mentioned mixed reducing solution and silver ammonia solution under high-speed stirring, control the reaction temperature at 15°C, and the reaction time is 10 minutes. Finally, the precipitate was washed three times with ultrapure water, and then washed once with absolute alcohol, and finally dried in a blast drying oven at 55°C for 24 hours, and powdered.
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