Microstructure evolution and bonding mechanism of ZrO2 ceramic and Ti-6Al-4V alloy joints brazed by Bi2O3-B2O3-ZnO glass paste

Ceramics and metal joinings have been widely employed in aerospace, dental implants , and the electronic packaging industry for fabricating multifunctional components. In this study, the 35Bi 2 O 3 -50B 2 O 3 -15ZnO (mol.%) glass has been employed for joining the ZrO 2 ceramic and Ti-6Al-4V alloy. The effect of brazing temperature on the microstructure evolution, mechanical properties , and bonding mechanism of brazed joints has been analyzed. The microstructure of the ZrO 2 /glass/Ti-6Al-4V joints and the content of Bi 4 B 2 O 9 , Bi 2 O 3 and Bi 24 B 2 O 39 precipitated crystals in glass were found to be dependent on the brazing temperature. The reaction product of Bi 4 Ti 3 O 12 was identified in the glass/Ti-6Al-4V interface because of the chemical reaction between the oxidized layer of Ti-6Al-4V alloy and glass. A maximum shear strength as high as 48.8 ± 5.2 MPa was obtained. Our work, thus, demonstrates that the 35Bi 2 O 3 -50B 2 O 3 -15ZnO glass is an effective bonding material for joining ZrO 2 ceramic and Ti-6Al-4V alloy under low temperature in an ambient atmosphere.