Thermal corrosion behavior of Yb4Hf3O12 ceramics exposed to calcium-ferrum-alumina-silicate (CFAS) at 1400 °C

In current work, the interaction between representative CFAS deposit (33CaO-10FeO1.5-13AlO1.5-44SiO2) and Yb4Hf3O12 ceramics at 1400 & DEG;C was investigated. Results indicated that the Yb4Hf3O12 ceramics are of high resistance to infiltration of CFAS melt. Microstructure characterization revealed that Yb4Hf3O12 reacted with CFAS to form a continuous reaction layer mainly composed of Yb-Ca-Si apatite, which inhibits CFAS further infiltration. Before the formation of the reaction layer, CFAS melts underwent a crystallization process at high temperatures, precipitating CaYbFeAlSi-garnet, which raised the viscosity of CFAS and thus inhibited the fluidity of CFAS.