Lead-free soft solder

Abstract

The invention relates to a soft solder which includes the alloying constituents bismuth and two of the three metals silver, copper and nickel, wherein bismuth forms between 20% by weight and 99.8% by weight of the alloy, silver forms between 0.1% by weight and 50% by weight of the alloy, copper forms between 0.1% by weight and 30% by weight of the alloy and nickel forms between 0.1% by weight and 30% by weight of the alloy.

1 . A soft solder, in particular an electronics solder, comprising:
 alloying constituents bismuth, silver and copper, wherein bismuth forms between about 20% by weight and about 99.8% by weight of the alloy, silver forms between about 0.1% by weight and about 50% by weight of the alloy, and copper forms between about 0.1% by weight and about 30% by weight of the alloy.   
   
   
       2 . The soft solder of  claim 1 , wherein bismuth forms between about 63% by weight and about 77% by weight of the alloy, silver forms between about 20% by weight and about 30% by weight of the alloy, and copper forms between about 0.1% by weight and about 10% by weight of the alloy. 
   
   
       3 . The soft solder of  claim 1 , wherein bismuth forms between about 68% by weight and about 72% by weight of the alloy, silver forms between about 24% by weight and about 26% by weight of the alloy, and copper forms between about 4.8% by weight and about 5.2% by weight of the alloy. 
   
   
       4 . The soft solder of  claim 1 , wherein bismuth forms about 70% by weight of the alloy, silver forms about 25% by weight of the alloy and copper forms about 5% by weight of the alloy. 
   
   
       5 . The soft solder of  claim 1 , wherein bismuth forms between about 78% by weight and about 92% by weight of the alloy, silver forms between about 0.1% by weight and about 20% by weight of the alloy, and copper forms between about 0.1% by weight and about 10% by weight of the alloy. 
   
   
       6 . The soft solder of  claim 1 , wherein bismuth forms between about 83% by weight and about 87% by weight of the alloy, silver forms between about 9% by weight and about 11% by weight of the alloy and copper forms between about 4.8% by weight and about 5.2% by weight of the alloy. 
   
   
       7 . The soft solder of  claim 1 , wherein bismuth forms about 85% by weight of the alloy, silver forms about 10% by weight of the alloy and copper forms about 5% by weight of the alloy. 
   
   
       8 . The soft solder of  claim 1 , wherein bismuth forms between about 88% by weight and about 92% by weight of the alloy, silver forms between about 9% by weight and about 11% by weight of the alloy, and copper forms between about 0.1% by weight and about 0.5% by weight of the alloy. 
   
   
       9 . The soft solder of  claim 1 , wherein bismuth forms about 90% by weight of the alloy, silver forms about 10% by weight of the alloy and copper forms about 0.1% by weight of the alloy. 
   
   
       10 . The soft solder of  claim 1 , wherein bismuth forms between about 88% by weight and about 92% by weight of the alloy, silver forms between about 4.8% by weight and about 5.2% by weight of the alloy, and copper forms between about 4.8% by weight and about 5.2% by weight of the alloy. 
   
   
       11 . The soft solder of  claim 1 , wherein bismuth forms about 90% by weight of the alloy, silver forms about 5% by weight of the alloy and copper forms about 5% by weight of the alloy. 
   
   
       12 . A soft solder, in particular an electronics solder, comprising:
 alloying constituents bismuth, copper and nickel, wherein bismuth forms between about 40% by weight and about 99.8% by weight of the alloy, copper forms between about 0.1% by weight and about 20% by weight of the alloy and nickel forms between about 0.1% by weight and about 20% by weight of the alloy.   
   
   
       13 . The soft solder of  claim 12 , wherein bismuth forms between about 71% by weight and about 85% by weight of the alloy, copper forms between about 15% by weight and about 25% by weight of the alloy and nickel forms between about 0.1% by weight and about 5% by weight of the alloy. 
   
   
       14 . The soft solder of  claim 12 , wherein bismuth forms between about 76% by weight and about 80% by weight of the alloy, copper forms between about 18.5% by weight and about 21.5% by weight of the alloy and nickel forms between about 1.8% by weight and about 2.2% by weight of the alloy. 
   
   
       15 . The soft solder of  claim 12 , wherein bismuth forms about 78% by weight of the alloy, copper forms about 20% by weight of the alloy and nickel forms about 2% by weight of the alloy. 
   
   
       16 . The soft solder of  claim 12 , wherein bismuth forms between about 82% by weight and about 96% by weight of the alloy, copper forms between about 5% by weight and about 15% by weight of the alloy and nickel forms between about 0.1% by weight and about 3% by weight of the alloy. 
   
   
       17 . The soft solder of  claim 12 , wherein bismuth forms between about 87% by weight and about 91% by weight of the alloy, copper forms between about 9% by weight and about 11% by weight of the alloy and nickel forms between about 0.8% by weight and about 1.2% by weight of the alloy. 
   
   
       18 . The soft solder of  claim 12 , wherein bismuth forms about 89% by weight of the alloy, copper forms about 10% by weight of the alloy and nickel forms about 1% by weight of the alloy. 
   
   
       19 . The soft solder of  claim 12 , wherein bismuth forms between about 87% by weight and about 99.8% by weight of the alloy, copper forms between about 2% by weight and about 8% by weight of the alloy and nickel forms between about 0.1% by weight and about 3% by weight of the alloy. 
   
   
       20 . The soft solder of  claim 12 , wherein bismuth forms between about 92% by weight and about 96% by weight of the alloy, copper forms between about 4% by weight and about 6% by weight of the alloy and nickel forms between about 0.8% by weight and about 1.2% by weight of the alloy. 
   
   
       21 . The soft solder of  claim 12 , wherein bismuth forms about 94% by weight of the alloy, copper forms about 5% by weight of the alloy and nickel forms about 1% by weight of the alloy. 
   
   
       22 . The soft solder of  claim 12 , wherein bismuth forms between about 88% by weight and about 99.8% by weight of the alloy, copper forms between about 2% by weight and about 8% by weight of the alloy and nickel forms about 0.1% by weight of the alloy. 
   
   
       23 . The soft solder of  claim 12 , wherein bismuth forms between about 93% by weight and about 97% by weight of the alloy, copper forms between about 4% by weight and about 6% by weight of the alloy and nickel forms about 0.1% by weight of the alloy. 
   
   
       24 . The soft solder of  claim 12 , wherein bismuth forms about 95% by weight of the alloy, copper forms about 5% by weight of the alloy and nickel forms about 0.1% by weight of the alloy. 
   
   
       25 . A soft solder, in particular an electronics solder, comprising:
 alloying constituents bismuth, silver and nickel, wherein bismuth forms between about 20% by weight and about 99.8% by weight of the alloy, silver forms between about 0.1% by weight and about 50% by weight of the alloy and nickel forms between about 0.1% by weight and about 30% by weight of the alloy.   
   
   
       26 . The soft solder of  claim 25 , wherein bismuth forms between about 61% by weight and about 75% by weight of the alloy, silver forms between about 25% by weight and about 35% by weight of the alloy and nickel forms between about 0.1% by weight and about 5% by weight of the alloy. 
   
   
       27 . The soft solder of  claim 25 , wherein bismuth forms between about 66% by weight and about 70% by weight of the alloy, silver forms between about 28% by weight and about 32% by weight of the alloy and nickel forms between about 1.8% by weight and about 2.2% by weight of the alloy. 
   
   
       28 . The soft solder of  claim 25 , wherein bismuth forms about 68% by weight of the alloy, silver forms about 30% by weight of the alloy and nickel forms about 2% by weight of the alloy. 
   
   
       29 . The soft solder of  claim 25 , wherein bismuth forms between about 71% by weight and about 85% by weight of the alloy, silver forms between about 15% by weight and about 25% by weight of the alloy and nickel forms between about 0.1% by weight and about 5% by weight of the alloy. 
   
   
       30 . The soft solder of  claim 25 , wherein bismuth forms between about 76% by weight and about 80% by weight of the alloy, silver forms between about 19% by weight and about 21% by weight of the alloy and nickel forms between about 1.8% by weight and about 2.2% by weight of the alloy. 
   
   
       31 . The soft solder of  claim 25 , wherein bismuth forms about 78% by weight of the alloy, silver forms about 20% by weight of the alloy and nickel forms about 2% by weight of the alloy. 
   
   
       32 . The soft solder of  claim 25 , wherein bismuth forms between about 81% by weight and about 95% by weight of the alloy, silver forms between about 5% by weight and about 15% by weight of the alloy and nickel forms between about 0.1% by weight and 5% by weight of the alloy. 
   
   
       33 . The soft solder of claim  257 , wherein bismuth forms between about 86% by weight and about 90% by weight of the alloy, silver forms between about 8% by weight and about 12% by weight of the alloy, and nickel forms between about 1.8% by weight and about 2.2% by weight of the alloy. 
   
   
       34 . The soft solder of  claim 25 , wherein bismuth forms about 88% by weight of the alloy, silver forms about 10% by weight of the alloy and nickel forms about 2% by weight of the alloy. 
   
   
       35 . The soft solder of  claim 25 , wherein bismuth forms between about 82% by weight about 97% by weight of the alloy, silver forms between about 5% by weight and about 15% by weight of the alloy and nickel forms about 0.1% by weight of the alloy. 
   
   
       36 . The soft solder of  claim 25 , wherein bismuth forms between about 88% by weight and about 92% by weight of the alloy, silver forms between about 8% by weight and about 12% by weight of the alloy, and nickel forms about 0.1% by weight of the alloy. 
   
   
       37 . The soft solder of  claim 25 , wherein bismuth forms about 90% by weight of the alloy, silver forms about 10% by weight of the alloy and nickel forms about 0.1% by weight of the alloy.