Fluxing technique for removing lead oxide

Details Fluxing technique for removing lead oxide Fluxing technique for removing lead oxide

1975-08-14

1976-07-20

Smith, Al Lawrence

Metal fusion bonding

Process

With protecting of work or filler or applying flux

228223, 148 23, 228263, B23K 35362

Patent

active

039702391

ABSTRACT:
A process for removing lead oxide from the surface of the lead solder of a semiconductor assembly in the inert atmosphere of a joining furnace by introducing into the joining furnace an acetate compound capable of reacting with lead oxide at the joining furnace temperature to form a coordinated lead compound. Both the acetate compound and the coordinated lead compound are gases at the joining furnace temperature. The acetate compound is preferably glacial acetic acid, acetic anhydride, or mixtures thereof.

REFERENCES:
patent: 3058210 (1962-10-01), Winters
patent: 3099590 (1963-07-01), Laudenslager
patent: 3412113 (1968-11-01), Fitch et al.
patent: 3665590 (1972-05-01), Percival
patent: 3754698 (1973-08-01), Bochinski et al.

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