公开(公告)号：DE69105793D1

公开(公告)日：1995-01-26

申请号：DE69105793

申请日：1991-02-06

Applicant: IBM

Inventor： HUANG WU-SONG ,  KHANDROS IGOR YAN ,  SARAF RAVI ,  SHI LEATHEN

IPC: B23K35/22 ,  B23K35/26 ,  B23K35/36 ,  B23K35/363 ,  B23K101/36 ,  C08K3/08 ,  H05K3/32 ,  H05K3/34

Abstract: An improved solder/polymer fluxless composite paste interconnection material having a low reflow temperature to form electrical contacts having good bonding strength and low contact resistance. The present pastes comprise a major proportion of a meltable metal alloy powder filler, free of noble metals and preferably free of lead, a minor proportion of a solution of a temperature-stable thermoplastic polymer having a softening temperature above the melting temperature of the metal powder filler in a volatile solvent which evaporates during reflow, and a minor proportion of a fluxing agent having a boiling point lower than the reflow temperature of the composition and higher than the melting point of the eutectic alloy powder filler. An oxide-free, partially coalesced metal alloy connection is obtained, which is polymer strengthened and reworkable at a low reflow temperature, per se, or in the presence of polymer solvent.

公开(公告)号：DE69105793T2

公开(公告)日：1995-06-29

申请号：DE69105793

申请日：1991-02-06

Applicant: IBM

Inventor： HUANG WU-SONG ,  KHANDROS IGOR YAN ,  SARAF RAVI ,  SHI LEATHEN

IPC: B23K35/22 ,  B23K35/26 ,  B23K35/36 ,  B23K35/363 ,  B23K101/36 ,  C08K3/08 ,  H05K3/32 ,  H05K3/34

Abstract: An improved solder/polymer fluxless composite paste interconnection material having a low reflow temperature to form electrical contacts having good bonding strength and low contact resistance. The present pastes comprise a major proportion of a meltable metal alloy powder filler, free of noble metals and preferably free of lead, a minor proportion of a solution of a temperature-stable thermoplastic polymer having a softening temperature above the melting temperature of the metal powder filler in a volatile solvent which evaporates during reflow, and a minor proportion of a fluxing agent having a boiling point lower than the reflow temperature of the composition and higher than the melting point of the eutectic alloy powder filler. An oxide-free, partially coalesced metal alloy connection is obtained, which is polymer strengthened and reworkable at a low reflow temperature, per se, or in the presence of polymer solvent.