Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1981-12-17
1987-01-06
Ramsey, Kenneth J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428672, H05K 706
Patent
active
046346384
ABSTRACT:
Brazing of elements to electronic chip carrying substrates requires brazing materials strong at high temperatures used to remove and replace chips. Flanges and pins are brazed with Au:Sn brazing alloys modified during brazing by addition of copper to the brazing material to promote formation of the higher melting point .beta. phase of the alloy and a Group VIII metal to draw Sn out of the melt by gettering, also to promote formation of the .beta. phase of the alloy and to thicken the braze material. A copper preform is plated with Ni and juxtaposed with surfaces to be brazed and the brazing material to add Ni and copper to the melt.
REFERENCES:
patent: 3496630 (1970-02-01), Duff et al.
patent: 3844026 (1974-10-01), Hutchins
patent: 4278990 (1981-07-01), Fichot
patent: 4360142 (1982-11-01), Carpenter
patent: 4418857 (1983-12-01), Ainslee
patent: 4465223 (1984-08-01), Cammarano et al.
Ainslie Norman G.
Harvilchuck Joseph M.
Interrante Mario J.
King, Jr. William J.
Palmateer Paul H.
International Business Machines - Corporation
Jones II Graham S.
Ramsey Kenneth J.
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