Patent ID: 9095936
Filing Date: 2015-08-04
Classification: B23K

Abstract:
1. A composition for a variable melting point solder, comprising: a) an alloy; said alloy including b) an additive metal separate from said alloy, being one of Ni, Sb, or combinations thereof; wherein said additive metal is present in an amount such that upon heating the composition to a soldering temperature above said initial solidus temperature, said alloy at least partially melts to form a liquid alloy, whereby said melting point depressant metal Sn dissolved in said liquid alloy reacts with at least said additive metal to remove all of said melting point depressant metal Sn dissolved in said liquid alloy, such that said liquid alloy solidifies isothermally at said soldering temperature to form a resultant solder consisting primarily of said base metal Bi, said resultant solder having a final solidus temperature; and at least one intermetallic compound between said melting point depressant metal Sn and said additive metal, such that said final solidus temperature is greater than said soldering temperature.