Joining SiC ceramics with ZrSi2-SiC filler at low temperatures

ZrSi2-SiC powder was employed as the joining material to join SiC ceramics in this study. The effects of SiC particle (SiCp) content and joining temperature on the phase composition, microstructure, and shear strength of SiC joints were studied and reported for the first time. Research results showed that introduction of SiCp into the interlayer improved the mechanical performance of the joint. When 10 wt.% SiCp was introduced into the interlayer, the optimal shear strength measured of the joint was 116.7 +/- 6.7 MPa under the joining condition of 1500 degrees C for 10 min. With the joining temperature increased, the shear strength of the joint gradually increases. When the joint was performed at 1600 degrees C for 10 min, an ultra-high temperature phase of ZrC was detected in the interlayer, and the shear strength of the joint was 168.1 +/- 12.6 MPa. The SiC joint with high mechanical strength might have the potential for application in the field of nuclear industry.