Lead-free solder
A lead-free solder and solder technology, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of environmental pollution, low wettability, high melting point, etc.
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[0018] Below in conjunction with embodiment the utility model is described further in detail, but content of the present invention is not limited to embodiment.
[0019] 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: Tin-silver master alloy: Add the refined tin containing 99.95% tin and the silver ingot containing 99.99% silver to the crucible according to the mass ratio of 70:30 and put it into the intermediate frequency furnace for smelting, vacuumize and fill with nitrogen, and heat up Heat it to 1200°C, keep it warm for 3 hours, stir for 30 minutes, take it out of the furnace, cool ...
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