Brazed joint between a beryllium-base part and a part primarily of a metal that is retractable with beryllium to form a brittle intermetallic compound

In combination, a first part that is primarily of beryllium, a second part that is primarily of a metal that forms brittle intermetallic compounds with beryllium at temperatures above a predetermined level, and a brazed joint between said first part and said second part that is made using temperatures above said predetermined level, said brazed joint comprising:

• a. a first layer of brazing alloy in contact with said first part along a predetermined broad interface and brazed thereto along said interface, said brazing alloy just prior to being brazed to said first part consisting essentially of silver and a minor constituent selected from the group consisting of tin, silicon, indium and combinations of two or more of said elemental minor constituents;
• the tin being present in a range of 4 to 15% by weight of the alloy in the case of a silver-tin alloy;
• the silicon being present in a range of 1 to 5% by weight of the alloy in the case of a silver-silicon alloy;
• the indium being present in a range of 6 to 25% by weight of the alloy in the case of a silver-indium alloy;
• and the combination being present in such a weight percentage that the alloy has a solidus temperature of between 675.degree. C. and 900.degree. C. in the case of an alloy of silver and said combination of elemental minor constituents;
• b. and means forming a brazed connection between said first layer and said second part,
• c. said first layer being sufficiently thick to preclude any significant amount of diffusion through said first layer into said interface of such metal from said second part or from said brazed connection that will form a brittle intermetallic compound with beryllium at temperatures used in making said brazed connection.