LOW-MELTING BRAZING FILLER METAL

摘要

The purpose of the present invention is to inhibit the formation of Cu3SnIMC in a lead-free, low-melting, Sn-Cu based brazing filler metal and thereby provide a low-melting brazing filler metal which can attain improved joint reliability. This brazing filler metal is an Sn-Cu alloy which further contains 0.1 to 2.0mass% of Ni. Specifically, the brazing filler metal has an Sn-Cu-Ni alloy composition that contains 0.1 to 2.0mass% of Ni and 7.6 to 41.4mass%, which corresponds to a hyper-eutectic range, of Cu with the balance being Sn and unavoidable impurities. Thus, the present invention makes it possible to inhibit the formation of Cu3SnIMC in a joint. Further, the melting point of the brazing filler metal is adjustable within a range of 415 to 640ºC, so that the brazing filler metal can be easily processed into various shapes.