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Vacuum brazing of Nb and stainless steel with Cu-Ti and Cu-Co-Ti filler metals

Yaoyong Cheng

Abstract

Vacuum brazing of Nb and stainless steel using Cu-Ti and Cu-Co-Ti filler metals was studied.Under the brazing condition of 960 ℃/20 min two Fe-and-Nb-rich reaction layers were formed respectively at the interfaces between Nb and the brazing seam,and between the brazing seam and the stainless steel.Compared with the joint brazed with Cu-Ti filler metal,the content of Cu in the reaction layer adjacent to the stainless steel is higher than the joint brazed with Cu-Co-Ti filler metal,so is the content of Nb in the brazing seam.The ambient-temperature tensile strength of the joint brazed with Cu-Co-Ti filler metal is slightly higher than that brazed with Cu-Ti filler.

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Key concepts: Brazing, Materials science, Filler metal, Metallurgy, Filler (materials), Ultimate tensile strength, Joint (building), Layer (electronics)