Abstract
Diffusion welding of titanium cylinders to an alumina cylinder (Ti/Al2O3/Ti) was carried out at temperatures above the α–β transition temperature of titanium. Titanium and alumina were welded under the following conditions: maximum heating temperature greater than 1400 K, holding time of 30 s, heating (cooling) rate of 1–10 K s−1, welding pressure of 1·6 MPa, and an air atmosphere. The shear strength of Ti/Al2O3/Ti welds was very low because of the residual stress at the welded interface. Alumina cylinders were welded using titanium foil as an insert (AI2O3/Ti foil/Al2O3). The shear strength of Al2O3/Ti foil/Al2O3 welds increased slightly with the decrease of foil thickness, and attained a maximum value of 82 MN m−2. When the foil thickness was less than 10 μm, the welds failed at the welded interface, but the welds with foil of 100 μm thickness failed in alumina close to the interface.
MST/1114
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