Interaction and infiltration behavior between calcium-ferrum-alumina-silicate and Yb₄Hf₃O₁₂ ceramics at various temperatures

The interaction and infiltration behavior between typical calcium-ferrumalumina-silicate (CFAS) and Yb4Hf3O12 ceramics at 1300, 1400, and 1500.C for different duration times were investigated. At 1300. C, the CFAS melt first crystallized and then generatedmassive anorthite with high-melting point, reducing the wettability of CFAS melt and physically blocking CFAS penetration paths. As the temperature increased to 1400.C and 1500 degrees C, the wettability of the molten CFAS correspondingly increases. A continuous reaction layer, composed of apatite, fluorite, and garnet, was formed over (YbHfO12)-Hf-4-O-3 ceramic due to the penetration of CFAS melt. Furthermore, the infiltration rate of CFAS decreases with increasing corrosion time because of the barrier effect primarily derived from the as-mentioned continuous reaction layer.