Abstract: A method of forming a superalloy part comprises: forming a preform from tape, said tape comprising a base metal layer and a braze alloy layer, said base metal layer comprising fibrillated polytetrafluoroethylene and an oxygen-sensitive superalloy base metal powder selected from the group consisting of titanium, aluminum, hafnium, and chromium, and said braze alloy layer comprising fibrilated polytetrafluoroethylene and braze alloy; heating the preform in an hydrogen or vacuum environment. Another method of forming a superalloy part comprises using a tape comprising fibrilated polytetrafluoroethylene, said oxygen-sensitive superalloy base metal powder, and powdered braze alloy.

Abstract: A braze paste is disclosed for brazing superalloys together which includes an organic binding system, a major amount of a nickel, cobalt, gold, silver, copper or palladium based braze alloy and ground polytetrafluoroethylene. The braze paste can be used to braze superalloys together without prior nickel treatment. In the brazing step, the polytetrafluoroethylene decomposes and forms fluoride ions which in turn acts on any oxide that may form during the brazing step to remove the oxide and permit a good braze between the metal objects.