Brazing of alumina with Ti4CU2O and Ti3CU3O interlayers

Alumina sections were joined using Ti4Cu20 and Ti3Cu3O braze interlayers and the microstructure, reaction products and mechanical strengths of the joints investigated. Results revealed that the final phase assemblages correspond to those expected based on the Ti-Cu-O ternary phase diagram. No cavitation was observed at the interfaces in the final microstructure. While the samples were robust under normal handling, many joints failed during preparation of mechanical test specimens and those few that remained exhibited very low four-point bend strengths. 11 refs.