Preparation method of platinized copper powder lead-free soldering paste
A lead-free solder, platinum copper technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of low surface insulation resistance, shortened template life, easy to produce solder balls, etc., and achieve high surface insulation resistance and low cost. , the effect of prolonging the service life
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example 1
[0019] First, according to the mass ratio of 1:5, the copper powder was stirred and mixed with the mass concentration of 5% sulfuric acid solution and placed in a beaker, ultrasonically dispersed at 300W for 15min, and then left to age for 10h, filtered and collected filter cake, at 80 Dry at ℃ for 8 hours to prepare the deoxidized copper powder; then according to the mass ratio of 1:5, stir and mix the deoxidized copper powder prepared above with the mass concentration of 10% tin chloride solution and place it in a beaker, at 1800r / min for 15 min, then collect the lower precipitate, wash 5 times with deionized water, and dry at 80°C for 8 h to prepare activated copper powder; then weigh 55 parts of polyvinyl alcohol and 10 parts of the above-mentioned The prepared activated copper powder and 35 parts of absolute ethanol were placed in a three-necked flask, magnetically stirred at 1600r / min for 15min, and then 0.8mol / L platinum nitrate solution was added dropwise to it, and th...
example 2
[0021]First, according to the mass ratio of 1:5, the copper powder was stirred and mixed with the mass concentration of 5% sulfuric acid solution and placed in a beaker, ultrasonically dispersed at 200W for 10min, and then left to age for 8h, filtered and collected filter cake, at 65 Dry at ℃ for 6 hours to prepare the deoxidized copper powder; then according to the mass ratio of 1:5, stir and mix the deoxidized copper powder prepared above with a mass concentration of 10% tin chloride solution and place it in a beaker, and heat it at 1500r / min for 10 min, then collect the lower precipitate, wash with deionized water three times, and dry at 65°C for 6 h to prepare activated copper powder; then weigh 45 parts of polyvinyl alcohol and 15 parts of the above-mentioned The prepared activated copper powder and 40 parts of absolute ethanol were placed in a three-necked flask, magnetically stirred at 1350r / min for 10min, and then 0.8mol / L platinum nitrate solution was added dropwise t...
example 3
[0024] First, according to the mass ratio of 1:5, the copper powder and the mass concentration of 5% sulfuric acid solution were stirred and mixed and placed in a beaker, ultrasonically dispersed at 250W for 12min, and then left to age for 9h, filtered and collected filter cake, at 70 Dry at ℃ for 7 hours to prepare the de-oxidized copper powder; then according to the mass ratio of 1:5, mix the de-oxidized copper powder prepared above with a mass concentration of 10% tin chloride solution and put it in a beaker, and heat it at 1700r / Centrifuge at 1 min for 12 min, then collect the lower precipitate, wash 4 times with deionized water, and dry at 70°C for 7 h to prepare activated copper powder; then weigh 50 parts of polyvinyl alcohol, 10 parts of the above-mentioned The prepared activated copper powder and 40 parts of absolute ethanol were placed in a three-necked flask, magnetically stirred at 1500r / min for 12min, and then 0.8mol / L platinum nitrate solution was added dropwise ...
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