Wetting and joining of silicon carbide with a molten glass under air

摘要

A method for joining silicon carbide between 1300°C and 1600°C under air atmosphere using calcium aluminosilicate glasses has been developed. This technology avoids protective atmosphere resulting in high production cost and allows repairing more easily damaged joined components. Many studies have been performed on the joining of SiC or SiC_f/SiC composites using glass-ceramics under vacuum or in neutral gases. Only a few studies are available in the literature on wetting and interfacial interactions between molten glasses and SiC as well as on the joining of SiC by glass-ceramics under air. Thus, the aim of this work is to study the wetting and the joining of SiC by calcium aluminosilicate glasses under air atmosphere. Wetting of calcium aluminosilicate glasses on SiC is studied by sessile drop technique under air between 1100°C and 1590°C. Good wetting is observed regardless of the experimental temperature when it is higher than 1300°C. Joining experiments are performed under air between 1300°C and 1600°C. A good filling of the joint by the glass is obtained as well as a high mechanical strength (the average shear strength at room temperature is 42 MPa).