Metal fusion bonding – Process – Preplacing solid filler
Patent
1990-03-26
1991-04-30
Heinrich, Sam
Metal fusion bonding
Process
Preplacing solid filler
228246, 228179, B23K 2300
Patent
active
050110675
ABSTRACT:
A standard tinned nickel-iron alloy lead frame has a plurality of pairs of extending tab portion positioned in a straight row. A long straight piece of an exothermically alloyable fuse wire, with a core of aluminum coaxially clad with palladium in approximately equal volumes, is held in contact with the plurality of pairs of lead frame tabs. Heat is applied to the fuse strand at two points; namely, on one and the other sides of each pair of tabs initiating progressive alloying in two directions from each heated point. When the progressive alloying and melting of the fuse strand reaches a tab, the tab is heated and heat sinks the fuse strand to stop the progressive alloying and melting. There is simultaneously formed a metallurgical bond between the ends of each remaining elemental fuse strand, respectively, and each of the pair of tabs that are bridged by that remaining elemental strand.
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IBM Technical Disclosure Bulletin, "Catalyst Soldering of Microcircuits", Mutter, vol. 5, No. 6, pp. 10, 11, Nov. 1962.
IBM Technical Disclosure Bulletin, "Current-Limited Chip Capacitor", vol. 27, No. 4A Sep. 1984, pp. 2026-2027.
Heinrich Sam
Sprague Electric Company
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