Spontaneous infiltration and wetting behaviors of a Zr-based alloy melt on a porous SiC substrate

摘要

The spontaneous infiltration and wetting behaviors of a Zr-based alloy melt on porous a SiC ceramic plate were studied using the sessile drop method by continuous heating and holding for 1800 s at different temperatures in a high-vacuum furnace. The results showed that the Zr-based alloy melt could partly infiltrate the porous SiC substrate without pressure due to the effect of capillary pressure. Wettability and infiltration rates increased with increasing temperature, and interfacial reaction products (ZrC0.7 and TiC) were detected in the Zr-based alloy/SiC ceramic system, likely because of the reaction of the active elements Zr and Ti with elemental C. Furthermore, the redundant element Si diffused into the alloy melt.