Joining of SiC ceramics by induction heated combustion synthesis of Ti3SiC2

Induction heating has been utilized to ignited the Self-Propagating High-Temperature Synthesis of Ti-Si-C(3∶1∶2 molar ratio)and Ti-Si-C-Al(3∶1∶2∶0.1 molar ratio)and SiC ceramics was joined by the induction heated combustion synthesis. From the perspective of the effect of processing parameters on the relative contents of Ti3SiC2phase in the synthesized products, the optimized processing parameters were preliminarily obtained: induction heating current of 50 A，holding current of 30 A for 30 minutes and joining pressure of 1 MPa. The shear strength of SiC/TSC/SiC and SiC/TSC-Al/SiC joints obtained by the optimized processing parameters were 32.9 and 66.8 MPa, respectively. The results of microstructural and component analysis showed that no obvious pores or cracks were detected from the SiC/TSC/SiC and SiC/TSC-Al/SiC interfaces. The results from XRD analysis revealed that the synthesized products mainly consisted of Ti3SiC2, little of TiC and Ti-Si compounds in the SiC/TSC-Al/SiC joint. And the contents of TiC phase were dominant in the SiC/TSC/SiC joint, which resulted in the average shear strength of the SiC/TSC-Al/SiC joint more than twice of the SiC/TSC/SiC joint.