초록 ▼

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 lithium. Optionally, the brazing alloy may further inc

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 lithium. 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, barium 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 beryllium. 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 requirements imposed on the brazing atmosphere from those imposed when using similar brazing alloys which, however, do not contain the last-mentioned elements.

대표청구항 ▼

In the process of joining aluminum containing articles which comprises heating in contact with said aluminum articles an aluminum silicon filler metal, the improvement which comprises interposing between said articles an aluminum-silicon base brazing alloy consisting predominantly of aluminum and co

In the process of joining aluminum containing articles which comprises heating in contact with said aluminum articles an aluminum silicon filler metal, the improvement which comprises interposing between said articles an aluminum-silicon base brazing alloy consisting predominantly of aluminum and containing from about 0.0001 to about 1% by weight of a substance selected from the group consisting of sodium, potassium and lithium, from about 0.00001 to about 1.0% by weight of said brazing alloy of berylium, and from about 0.01 to 10% by weight of at least one material selected from the group consisting of bismuth, strontium, barium, and antimony, maintaining said aluminum articles and said brazing alloy under an inert gas atmosphere or under a vacuum, brazing said articles with said alloy, and performing said brazing operation in the absence of a flux.