| Summary: | Titanium and zirconia (ZrO<sub>2</sub>) ceramics are widely used in biomedical fields. This study aims to achieve reliable brazed joints of titanium/ZrO<sub>2</sub> using biocompatible Au filler for implantable medical products. The effects of brazing temperature and holding time on the interfacial microstructures and mechanical properties of titanium/Au/ZrO<sub>2</sub> joints were fully investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results indicated that the typical interfacial microstructure of the titanium/Au/ZrO<sub>2</sub> joint was titanium/Ti<sub>3</sub>Au layer/TiAu layer/TiAu<sub>2</sub> layer/TiAu<sub>4</sub> layer/TiO layer/ZrO<sub>2</sub> ceramic. With an increasing brazing temperature or holding time, the thickness of the Ti<sub>3</sub>Au + TiAu + TiAu<sub>2</sub> layer increased gradually. The growth of the TiO layer was observed, which promoted metallurgical bonding between the filler metal and ZrO<sub>2</sub> ceramic. The optimal shear strength of ~35.0 MPa was obtained at 1150 °C for 10 min. SEM characterization revealed that cracks initiated and propagated along the interface of TiAu<sub>2</sub> and TiAu<sub>4</sub> reaction layers.
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