Effect of Interface Shape on Bonding Strength of TiB₂-Ni Joined Body

Abstract

Possibility of decreasing the residual stress on the metal-ceramics interface was investigated with a TiB₂-Ni system. The ceramics surface was deformed by an electrical discharge machining with a metal electrode. In this study, outer and/or inner shapes effects were investigated with a cylindrical joining material. Six joining shapes were produced by a direct diffusion bonding method under a high vacuum and high temperature condition.
The following results are obtained:
In the changing of outer shapes, the highest bonding strength is obtained at the suitable joining temperature region and the interface slop. On the suitable joining temperature region, the fracture behavior transfers from interface fracture to ceramics side failure. Also the bonding strength and fracture behaviors are affected by the inner and the outer interface shapes. From the abovementioned results, the bonding strength will be controlled by the interface surface shapes and the bonding temperature.