Effect of Microsilica Addition on Properties of CMA72 Bonded Al2O3-MgO Castables  

作　　者：GAO Jianying ZHANG Ziyi BRUNO Touzo CAO Biao 

机构地区：[1]Kerneos Research Center Asia,Tianjin 300457,China [2]Kerneos(China)Aluminate Technologies Co.,Ltd.,Tianjin 300457,China

出　　处：《China's Refractories》2016年第2期1-6,共6页中国耐火材料（英文版）

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.

关 键 词：alumina - magnesia castable microsilicadosage permanent linear change CMA72 

分 类 号：TQ175.732[化学工程—硅酸盐工业] TM912.1[电气工程—电力电子与电力传动]