Metal fusion bonding – Process – Preplacing solid filler
Patent
1988-07-25
1989-05-23
Godici, Nicholas P.
Metal fusion bonding
Process
Preplacing solid filler
228179, 228 41, 228 51, 228 563, 29874, 29877, 29879, B23K 300, H01L 2158
Patent
active
048322555
ABSTRACT:
This invention employs a carrier upon which a thin conductive film has been applied. The conductive film is of a metallic material which exhibits a surface energy such that it is not readily wetted by solder. A patterned mask is disposed on the conductive film, with the mask having openings which expose selected areas of the conductive film. Solder is deposited in the mask openings and is weakly adherent to the exposed areas of the conductive film. The carrier is then disposed over and in registration with conductive land areas of a circuit carrier, such that the solder in the mask openings is aligned with the land areas of the circuit carrier. Subsequently, the carrier and circuit land areas are brought into contact, heated, the solder bonded to the lands, and the carrier is lifted away for subsequent reuse.
In another species of the invention, a thin film layer of solder is directly deposited on and weakly adherent to a flexible base layer. Subsequently, tool means which registers with the areas to be soldered, presses the base layer/solder combination against the areas to be coated with solder, thereby causing the solder to adhere to the underlying circuit configuration.
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patent: 4209893 (1980-07-01), Dyce et al.
patent: 4354629 (1982-10-01), Grassauer et al.
patent: 4484704 (1984-11-01), Grassauer et al.
Bickford Harry R.
Grebe Kurt R.
Kovac Caroline A.
Palmer Michael J.
Godici Nicholas P.
Heinrich Samuel M.
International Business Machines - Corporation
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