Metal fusion bonding – Process – Metal to nonmetal with separate metallic filler
Patent
1984-12-04
1986-11-11
Godici, Nicholas P.
Metal fusion bonding
Process
Metal to nonmetal with separate metallic filler
228190, 228206, 22826312, 22826316, 22826321, B23K 3102
Patent
active
046217614
ABSTRACT:
This invention is a process for joining metals to ceramics to form very strong bonds using low brazing temperature, i.e., less than 750.degree. C., and particularly for joining nodular cast iron to partially stabilized zirconia. The process provides that the ceramic be coated with an active metal, such as titanium, that can form an intermetallic with a low melting point brazing alloy such as 60Ag-30Cu-10Sn. The nodular cast iron is coated with a noncarbon containing metal, such as copper, to prevent carbon in the nodular cast iron from dissolving in the brazing alloy. These coated surfaces can be brazed together with the brazing alloy between at less than 750.degree. C. to form a very strong joint. An even stronger bond can be formed if a transition piece is used between the metal and ceramic. It is preferred for the transition piece to have a coefficient of thermal compatible with the coefficient of thermal expansion of the ceramic, such as titanium.
REFERENCES:
patent: 1997538 (1935-04-01), Armstrong
patent: 2024150 (1935-12-01), Davignon
patent: 3063144 (1962-11-01), Palmour
patent: 3432913 (1969-03-01), Bronnes et al.
patent: 3736648 (1973-06-01), Spielberg et al.
patent: 4433230 (1984-02-01), Sano et al.
David Stan A.
Hammond Joseph P.
Woodhouse John J.
Cuda Carmine
Godici Nicholas P.
Hamel Stephen D.
Hightower Judson R.
Lovingood Katherine P.
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