Thermal Diffusion Bonding of Pure Titanium to 304 Stainless Steel Using Aluminum Interlayer

Abstract

As for thermal diffusion bonding of pure titanium to 304 stainless steel using aluminum interlayer, the temperature is ranged from 550 °C to 650 °C for 2 h under 2 MPa load in vacuum. The microstructures, chemical compositions and reaction products of the transition joints were revealed in SEM, EDS and XRD, respectively. The results have shown that the thickness of the diffusion layer increases with the increase of treatment temperature and the diffusion layer appears on the titanium side at the temperature of 650 °C. In this process, aluminum not only plays a mid sole element to prevent iron diffusion to titanium master alloys forming brittle intermetallic phase Fe-Ti, but also makes iron elements, titanium and the aluminum element form a stable diffusion layer.