Effect of different joining temperatures on IN600/SiC brazed joints

Abstract

Abstract IN600 superalloy and SiC ceramics has been conducted using an active AgCuTi filler, and the composite joints were characterized using scanning electron microscopy coupled with energy-dispersive x-ray spectrometry (SEM–EDS). The results demonstrate successful joining by carefully selecting brazing temperatures and holding times to produce high-integrity joints. The interfacial microanalysis revealed the formation of TiC and Ti5Si3 near the SiC side due to the reaction between titanium, carbon, and silicon. On the IN600 superalloy side, a Ti-Ni compound (TiNi3) was formed as a result of titanium reacting with nickel. The typical microstructure of the brazing joint interface includes: TiC+TiNi3, TiC, Cu(s,s)+Ag(s,s) and TiC+Ti5Si3. Furthermore, the shear strength evaluation of the joints was also conducted at ambient temperatures using a shear test. The experimental findings showed that the sample exhibited the highest shear strength (38 MPa) when subjected to brazing at 910 °C for 10 min. Fracture occurred at the interface between the base material and AgCuTi filler at higher brazing temperature (930 °C).