C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/79
C22C 21/04 (2006.01) B23K 35/28 (2006.01)
Patent
CA 1051693
PROCESS AND ALLOY FOR BRAZING ALUMINUM-CONTAINING ARTICLES ABSTRACT OF THE DISCLOSURE An aluminum-silicon base brazing alloy contains between 4 and 20 percent by weight of silicon and between 0.0001 and 1.0 percent by weight, preferably between 0.005 and 0.1 percent by weight, of at least one of the elements sodium, potassium and lith- ium. Optionally,the brazing alloy may further include between 0.01 and 10 percent by weight, preferably between 0.05 and 2 percent by weight, of at least one of the elements bismuth, strontium, bar- ium and antimony as well as between 0.00001 and 1.0 percent by weight, preferably between 0.0002 and 0.1 percent by weight of ber- yllium. The remainder of the alloy consists essentially of aluminum and impurities conditioned by production of the brazing alloy. The alloy is used for the fluxless brazing of aluminum-containing articles in substantially non-oxidizing atmospheres. The elements sodium, potassium and lithium make it possible to relax the require- ments imposed on the brazing atmosphere from those imposed when using similar brazing alloys which, however, do not contain the last- mentioned elements. -1-
204512
Schoer Heinz
Schultze Werner
LandOfFree
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