INTERACTION OF CAO-FEO-SIO2 SLAGS WITH PARTIALLY-STABILIZED ZIRCONIA

Calcia- and magnesia-partially-stabilized zirconia samples were corrod ed under static and dynamic conditions in three slags from the CaO-FeO -SiO2 system. Low-basicity and high-FeO slags corroded the samples by leaching magnesia from the cubic phase in the specimen, causing its de stabilization and ultimate dissolution. However, a higher-basicity sla g which proved the most corrosive of the three promoted bulk dissoluti on of the cubic phase instead, the rate of which was controlled by the thickness of the adjacent slag boundary layer. The levels of sample c orrosion both at and below the slag line are used to illustrate the ef fects of experimental variables, including slag composition, specimen density, and slag motion.