Brazing of Alumina to Copper Using Cu-Ti-Co

Abstract

Joint of alumina ceramics (98.1% Al₂O₃) to copper was made using Cu-(10-50wt%)Ti-(5wt%)Co brazing filler metals. The Cu-30wt%Ti-5wt%Co brazing achieved the highest shear strength 195 MPa at room temperature.
The composition and structure of the ceramic-metal bond zone in the Al₂O₃-Cu joints were analyzed by SEM, EPMA and X-ray diffraction.
The microstructure of interface between Al₂O₃ and Cu-Ti-Co brazing filler metal was shown to form the reaction layer consisting of (Al, Ti)₂O₃ solid solution oxide, titanium oxide TiO_x and CoAl₂O₄ compound.