Evaluation of low-temperature glass fillers and joining of reaction-bonded silicon carbide ceramics at vacuum

In this study, three distinct low-temperature glass fillers for vacuum-assisted joining of reaction-bonded silicon carbide (RB-SiC) were designed. Additionally, the physical properties, microscopic morphologies and joints strength of these glass fillers were investigated. The results indicate that Zinc Borosilicate (ZBS) glass filler is the most effective for joining RB-SiC under the specified conditions. ZBS demonstrates optimal glass skeleton for joining, a compatible coefficient of thermal expansion, and superior wettability compared to the other tested powders. Notably, the shear strength of the RB-SiC joints with ZBS reached 80 MPa, markedly surpassing that of Lead zinc borate (PZB) and Lead borosilicate (PBS) by 381 % and 400 %, respectively.