Low temperature brazing of biomedical titanium and zirconia metallized with Sn-Ti metal foil.

Zirconia ceramic and titanium have been applied more and more extensively in biomedical fields. In this work, reliable brazed joints of ZrO 2 /Sn-3Ti/AuSn20/Ti were achieved by pre-metallized ZrO 2 using biocompatible Sn-3Ti foil. The interfacial microstructures and mechanical properties of the joints brazed at different brazing temperatures for different holding times were fully investigated. The typical interfacial microstructure of ZrO 2 /Sn-3Ti/AuSn20/Ti joint was ZrO 2 /Ti 2 O 3 + Ti 11.3 Sn 3 O 10 / β-Sn + Ti 6 Sn 5 + Ti 3 Sn + AuSn 2 + AuSn 4 + massive AuTi 5 Sn 3 /layered AuTi 5 Sn 3 /Ti. The brazing temperatures and holding times had great influences on the type, quantity and morphology of the intermetallic compounds (IMCs) in the joints. The main phase on the interface transformed from AuSn 2 to AuSn 4 and IMCs gradually agglomerated and grew up. Besides, the thickness of layered AuTi 5 Sn 3 increased. The optimal shear strength of ∼48.6 MPa was obtained at 550 °C for 30 min. The joint cracked at Ti 2 O 3 layer on the ZrO 2 side and extended along the AuSn 2 phase and the massive AuTi 5 Sn 3 phase. • Low temperature brazing of biomedical ZrO 2 /Ti was achieved by pre-metallized ZrO 2 using Sn-Ti foil. • The main phase in Zone II transformed from AuSn 2 to AuSn 4 and layered AuTi 5 Sn 3 thickened as the brazing parameters increased. • The thickness of layered AuTi 5 Sn 3 greatly affected the crack of the joints. • ftable The optimal shear strength of ∼48.6 MPa was obtained at 550 °C for 30 min. [ABSTRACT FROM AUTHOR]