Abstract
Medical titanium and alumina (Al2O3) bioceramic are widely utilized as biomaterials. A reliable brazed joint of titanium and alumina was successfully obtained using biocompatible Au foil for implantable devices in the present study. The interfacial microstructure and reaction products of titanium/Au/Al2O3 joints brazed under different conditions were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). In this study, the typical interfacial microstructure of the titanium/Au/Al2O3 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/Au + granular TiAu4 layer/TiOx phase/Al2O3 ceramic. With increasing brazing temperature or holding time, the thicknesses of Ti3Au + TiAu + TiAu2 layers adjacent to the titanium substrate increased gradually. Shear tests indicated that the joint brazed at 1115 °C for 3 min exhibited the highest shear strength of 39.2 MPa. Typical fracture analysis displayed that the crack started at the Al2O3 ceramic and propagated along the interface of TiAu2 and TiAu4 reaction layers.
Highlights
Titanium and its alloys have been intensively investigated and applied for biomedical applications because of their excellent biocompatibilities, mechanical properties, and corrosion resistances [1,2,3,4,5,6].Applications have included dental implants, craniomaxillofacial implants, implants for artificial joint replacement and spinal components, internal fixation plates and screws, and housings for ventricular-assist devices and pacemaker cases [7,8,9]
Afterwards, in order to investigate the impact of brazing temperature microstructures andand mechanical properties of theof brazed joints, the brazing brazing temperatureononthethe microstructures mechanical properties the brazed joints, the specimens were held for min at different brazing temperatures
Vacuum brazing of titanium alloy and Al2 O3 ceramic was achieved using Au filler foil
Summary
Titanium and its alloys have been intensively investigated and applied for biomedical applications because of their excellent biocompatibilities, mechanical properties, and corrosion resistances [1,2,3,4,5,6]. The type of Ti oxide depends on the activity of Ti in the reaction layer, which could be decreased by the interaction between Ti and Ni from Kovar substrate to form Ni3 Ti, resulting in a shift of reaction product from TiO to Ti2 O3 or Ti3 O5 [35]. This is observed by other investigations [38,39,40]. Mechanical properties were analyzed from microhardness data for different phases as well as shear strength of the joints
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