Lead-free solder
A technology of lead-free solder and solder, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., which can solve the problems of low wettability, harmfulness to humans, and high melting point
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[0017] The present invention will be further specifically described below in conjunction with the examples, but the content of the present invention is not limited to the examples.
[0018] Because the melting points of silver, copper, tin, and phosphorus are different from those of tin, among them, silver and copper have higher melting points. In order to balance the melting point in tin-based smelting, and to more accurately grasp the addition amount of indium, a relatively precious metal, on the production site , the method of preparing master alloy can be adopted. The master alloy and its preparation method are as follows:
[0019] Tin-silver master alloy: put refined tin containing 99.95% tin and silver ingots containing 99.99% silver into a crucible at a mass ratio of 70:30 and put them into an intermediate frequency furnace for melting, vacuumize and fill with nitrogen, heat up to 1200°C, and keep warm for 3 hours. Stir for 30 minutes, take it out of the furnace, cool ...
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