Effect of CaO Impurity on Mullite Formation from SiO_(2) Gel and Al_(2)O_(3) Powders  

作　　者：GENG Qiankun TIAN Xuekun WANG Hongsen SHEN Jiaxin OUYANG Deze ZHAO Fei LIU Xinhong 

机构地区：[1]Henan Key Laboratory of High Temperature Functional Ceramics,School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450052,China

出　　处：《China's Refractories》2024年第1期34-39,共6页中国耐火材料（英文版）

基　　金：This work was financially supported by National Natural Science Foundation of China(Nos.52172031 and 51872266).

摘　　要：To broaden the application of SiO_(2) sol-bonded castables,using micro-or nano-Al_(2)O_(3) powder and SiO_(2) gel powder as the main raw materials,the effects of CaO impurity on the formation of mullite by the reaction of Al_(2)O_(3) and SiO_(2) at different temperatures(1350,1400,1500,and 1600℃)in different atmospheres(oxidation atmosphere and reduction atmosphere)were studied.The results show that in the oxidizing atmosphere,the introduction of CaO can promote the formation of mullite.When the temperature increases from 1350℃to 1600℃,the amount of mullite formed gradually increases.In the reducing atmosphere,the introduction of CaO is not conducive to the formation of mullite,and the amount of mullite decreases with the increasing temperature.The smaller the particle size of Al_(2)O_(3),the more easily it reacts with SiO_(2) gel powder to form mullite.

关 键 词：CAO MULLITE ATMOSPHERE temperature particle size 

分 类 号：TQ175.712.1[化学工程—硅酸盐工业]