VACUUM BRAZING BETWEEN SiCp/6063 Al MMCs AND Fe-Ni ALLOYS

Article history: Received: 4.9.2015. Received in revised form: 1.12.2015. Accepted: 2.12.2015. This research paper deals with the joining of different materials such as SiCp/6063Al MMCs and Fe-Ni alloys by means of vacuum brazing with active filler metal Ag47-Cu18-In17-Sn17-Ti1. With the optimal process parameters, i.e., brazing temperature 580 °C, soaking time of 30 min and vacuum degree of 6.5×10 Pa, the joint shear strength can achieve the maximum of 56 MPa. Once the brazing temperature of 580 °C has exceeded the solidus temperature of SiCp/6063Al MMCs, the specimen can still keep the original shape due to the stiffness of composites. Sufficient diffusion between brazing filler metal and SiCp/6063Al MMCs could occur across the interface in liquid phase considerably faster than that in solid phase. The component analysis indicates that the elements in filler metal such as Ag, Sn and In can diffuse into SiCp/6063Al MMCs, which is believed to be beneficial for the joint quality.