Stephen F. Corbin - Waterloo, Ontario, N2J 4Y3, CA
Douglas J. McIsaac - Waterloo, Ontario, N2L 6E5, CA
Xin Qiao - Boise ID, 83706
75255, 75245, 148 24, 252513, 252514, 2525181, 2525201
Variable melting point solders and brazes having compositions comprising a metal or metal alloy powder having a low melting point with a metal powder having a higher melting point. Upon heating, in-situ alloying occurs between the low and high melting point powders such that solidification occurs at the solder or braze temperature thus creating a new, higher solidus (or melting) temperature with little or no intermetallic formation. A solder comprising Sn powder mixed with a SnâBi eutectic powder having a composition of 63 wt % Sn:57 wt % Bi such that the bulk composition of the mixture is 3 wt % Bi has an initial melting point of 140Â° C. and a re-melt temperature of 220Â° C. after heating due to in-situ alloying. A composition of Pb powder mixed with a PbâSn eutectic powder having a composition of 62 wt % Sn:58 wt % Pb such that the bulk composition of the mixture is 15 wt % Sn has an initial melting point of 183Â° C. and a re-melt temperature of 250Â° C.