Microstructure and mechanical property of Al₂O₃/Ti joint with biocompatibility

In this paper, the experimental materials of Al₂O₃ ceramic and pure Ti metal were modified by metals Mo and Ti by magnetron sputtering and brazed using Au filling metal. The effect of joining process and Ti metallizing layer thickness on the microstructure and mechanical property of the joints was investigated. The results show that the microstructure of the Al₂O₃/Ti joint mainly consisted of Au braze and (Au, Mo)ss. There were a few (Ti, Mo)ss and Ti_xAu_y intermetallic compounds (IMCs) among the (Au, Mo)ss. A few TiO₂ and Ti_xAu_y IMCs were also observed at the Al₂O₃/braze interface and in the weld. The kind of phases in the weld was free from influence of bonding temperature, holding time and Ti metallizing layer thickness. However, both the number and distribution of phases in the weld change with bonding temperature, holding time and Ti metallizing layer thickness. The shear strength of joints was changed by the bonding temperature, holding time and Ti metallizing layer thickness because these factors influenced the distribution uniformity of solid solution and the number of IMCs in the weld. When the thickness of Ti metallized layer was 0.2 μm, maximum shear strength of 138 MPa was achieved at 1 080℃ for 5 min.