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 WANG Zhiqiang;LEI Zhongxing;XU Guotao;PENG Xiaoqian;ZHU Boquan;LIU Li;GUO Zongqi

作者机构：Wugang Refractory Co.Ltd.Wuhan 430080China R&D Center of Wuhan Iron and Steel Co.Ltd.Baosteel Central Research InstituteWuhan 430080China Wuhan University of Science and TechnologyWuhan 430081China Xi’an University of Architecture and TechnologyXi’an 710055ChinaAbstract 

出 版 物：《China's Refractories》 (中国耐火材料（英文版）)

年 卷 期：2023年第32卷第1期

页      面：6-13页

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 

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

主　　题：lightweight alumina-magnesia castables microporous corundum ultrafine powder1 

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.