摘要
CMA72 bonded Al2 O3 - MgO castable is promising for application of steel ladle wall, because of unique combination of thermo-mechanical properties, slag corro- sion resistance and cost benefit. In these castables, mi- crosilica can be introduced to counterbalance the expan- sion generated by spinel formation. In this paper, the of microsilica dosage on properties of eastables was evaluated. Expansion, expressed by the permanent linear change （PLC）, is highly dependent on the dosage of microsilica. Unexpected expansion occurs when the dos- age of microsilica is too low due to dominant effect of spinel and CA6 formation. Too high dosage results in sintering shrinkage, which is related to amount of liquid phase generated by microsilica addition. In addition, HMOR declines dramatically with increasing microsilica dosage. Considering the balance between expansion con- trol and hot property retention, 1.0 mass% of microsili- ca is recommended for the castable containing 4 mass% of magnesia.
CMA72 bonded Al2 O3 - MgO castable is promising for application of steel ladle wall, because of unique combination of thermo-mechanical properties, slag corro- sion resistance and cost benefit. In these castables, mi- crosilica can be introduced to counterbalance the expan- sion generated by spinel formation. In this paper, the of microsilica dosage on properties of eastables was evaluated. Expansion, expressed by the permanent linear change （PLC）, is highly dependent on the dosage of microsilica. Unexpected expansion occurs when the dos- age of microsilica is too low due to dominant effect of spinel and CA6 formation. Too high dosage results in sintering shrinkage, which is related to amount of liquid phase generated by microsilica addition. In addition, HMOR declines dramatically with increasing microsilica dosage. Considering the balance between expansion con- trol and hot property retention, 1.0 mass% of microsili- ca is recommended for the castable containing 4 mass% of magnesia.
