Fabrication and Improving Properties of Lightweight Al_(2)O_(3)-MgO Castables for L adle Working Lining  

作　　者：WANG Zhiqiang LEI Zhongxing XU Guotao PENG Xiaoqian ZHU Boquan LIU Li GUO Zongqi 

机构地区：[1]Wugang Refractory Co.,Ltd.,Wuhan 430080,China [2]R&D Center of Wuhan Iron and Steel Co.,Ltd.,Baosteel Central Research Institute,Wuhan 430080,China [3]Wuhan University of Science and Technology,Wuhan 430081,China [4]Xi’an University of Architecture and Technology,Xi’an 710055,ChinaAbstract

出　　处：《China's Refractories》2023年第1期6-13,共8页中国耐火材料（英文版）

基　　金：the National Natural Science Foundation of China(grant no.51774218 and 51374162)for providing financial support for this work.

摘　　要：Three lightweight Al_(2)O_(3)-MgO castables were fabricated with tabular alumina or microporous corundum as the aggregates,reactiveα-Al_(2)O_(3)micropowder,tabular alumina powder,and fused magnesia powder as the matrix,calcium aluminate cement as the binder,and MgO ultrafine powder(d50=5.4μm)and Al(OH)3 ultrafine powder(d50=8.2μm)as additives.The influence of aggregates and ultrafine powders on the properties,including pore size distribution,heat conductivity,thermal shock resistance,and slag resistance of lightweight refractory castables was investigated.The results show that the incorporation of microporous corundum reduces the bulk density of Al_(2)O_(3)-MgO castables,and MgO and Al(OH)3 ultrafine powders further increases the proportion of micropores in castables,which is beneficial to reducing the heat conductivity,and improving the thermal shock resistance and slag resistance of castables.Additionally,MgO ultrafine powder and Al(OH)3 ultrafine powder increase the fluidity and the strength of castables.

关 键 词：lightweight alumina-magnesia castables microporous corundum ultrafine powder1 

分 类 号：TF703[冶金工程—钢铁冶金] TQ175.732[化学工程—硅酸盐工业]