Effect of Raw Bauxite Addition on Thermal Behaviour of Ultra-low Cement Al_2O_3-SiO_2 Castables

作     者：HOU Wanguo ZHOU Ningsheng 

作者机构：High Temperature Materials Institute Henan University of Science and Technology Luoyang 471003 China 

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

年 卷 期：2009年第18卷第3期

页      面：15-17页

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Raw bauxite Thermo-gravimetric change,Explosion resistance ULC castables Alumina silicasystem 

摘      要：This work investigated the thermo-gravimetric （TG） change and explosion resistance of ultra-low cement Al2O3 - SiO2 castables added with 0, 5%, 10%, 15% and 20% of 474 μm raw bauxite powders containing 72.8% Al2O3, respectively. The castables were prepared using white fused alumina as aggregate, powders of white fused alumina, fused mullite,α-Al2O3 ultrafines, 3% CA cement and 5% microsilica as the matrix portion. TG change of the castables was investigated by a thermo-gravimetric analyzer for large size specimen. When the raw bauxite addition is less than 10%, the mass-losing behavior of the castables is similar to that without raw bauxite, tending to reach a constant mass around 400 ℃ , before which the mass-loss is mild and producing little destructive influence. With more than 10% raw bauxite addition, however, the mass-loss increases significantly, and the temperature to reach a constant mass increases to 600 ℃ or higher, unfavorable to structural stabilization. With the raw bauxite addition up to 20% , no negative influence on explosion resistance is found.