Abstract
In this study, implantable Al2O3/Ti-13Nb-13Zr (TNZ) alloy joints were achieved by diffusion bonding. The effects of bonding temperature and holding time on interfacial microstructure and mechanical properties were investigated. The interfacial microstructures of the joints bonded at various temperatures and holding time were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The typical microstructure of the Al2O3/TNZ joint, which was obtained at 1175 °C for 60 min under a pressure of 3 MPa, was Al2O3 ceramic/TiAl layer + TiO2 + Nb2O5 + AlNb2/continuous Ti3Al layer/acicular Ti3Al + Ti (s,s)/TNZ substrate. The presence of Ti element mainly contributed to the metallurgical bonding between TNZ and Al2O3 ceramic. Nb reacted with Al2O3 ceramic forming Nb2O5 and AlNb2 phases which played important roles in interfacial bonding. With the increase of bonding temperature or holding time, TiAl layer and Ti3Al layer thickened gradually while the number of Nb2O5 and AlNb2 first increased and then decreased. This corresponded to the change of average shear strength of these joints, which initially rose and then declined. The maximum of average shear strength reached 52.0 MPa when joints bonded at 1175 °C for 60 min under a pressure of 3 MPa, and the bonded joints mainly fractured at Al2O3 ceramic.
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