Joining of Zirconia and Ti-6A1-4V Using a Ti-based Amorphous Filler

Polycrystalline ZrO 2 -3 mol.%Y 2 O 3 was brazed to Ti-6AI-4V by using a Ti 47 Zr 28 Cu 4l Ni 11 (at.%) amorphous ribbon at 1123–1273 K in a high vacuum. The influences of brazing temperature on the microstructure and shear strength of the joints were investigated. The interfacial microstructures can be described as ZrO 2 /TiO+TiO 2 +Cu 2 Ti 4 O+Ni 2 Ti 4 O/α-Ti+(Ti,Zr) 2 (Cu,Ni) eutectic/acicular Widmanstaten structure/Ti-6AI-4V alloy. With the increase in the brazing temperature, the thickness of the TiO+TiO 2 +Cu 2 Ti 4 O+Ni 2 Ti 4 O layer reduced, the content of the α-Ti+(Ti,Zr) 2 (Cu,Ni) eutectic phase decreased, while that of the coarse α-Ti phase gradually increased. The shear strength of the joints did not show a close relationship with the thickness of the TiO+TiO 2 +Cu 2 Ti 4 O+Ni 2 Ti 4 O layer. However, when the coarse (Ti,Zr) 2 (Cu,Ni) phase was non-uniformly distributed in the α-Ti phase, or when α-Ti solely situated at the center of the joint, forming a coarse block or even connecting into a continuous strip, the shear strength greatly decreased.