耐火材料 ›› 2023, Vol. 57 ›› Issue (2): 107-112.DOI: 10.3969/j.issn.1001-1935.2023.02.004

• 研究开发 • 上一篇    下一篇

CaO杂质对SiO2凝胶粉与Al2O3粉反应生成莫来石的影响

耿乾坤, 杨卓冉, 胡倩影, 田学坤, 汪洪森, 申家欣, 欧阳德泽, 刘新红   

  1. 郑州大学材料科学与工程学院 河南省高温功能材料重点实验室 河南郑州 450052
  • 收稿日期:2022-04-25 出版日期:2023-04-15 发布日期:2023-04-17
  • 作者简介:耿乾坤:男,1997年生,硕士研究生。E-mail:gengqiankk@163.com
  • 基金资助:
    国家自然科学基金项目(51872266,52172031);河南省科技攻关项目(No.222102230030)。

Effect of CaO impurity on mullite formation from SiO2 gel and Al2O3 powders

Geng Qiankun, Yang Zhuoran, Hu Qianying, Tian Xuekun, Wang Hongsen, Shen Jiaxin, Ouyang Deze, Liu Xinhong   

  1. First author’s address: Henan Key Laboratory of High Temperature Functional Ceramics, School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450052, Henan, China
  • Received:2022-04-25 Online:2023-04-15 Published:2023-04-17

摘要: 为拓宽SiO2溶胶结合浇注料的应用,以微米或纳米级Al2O3粉和SiO2凝胶粉为主要原料,研究在不同温度(1 350、1 400、1 500、1 600 ℃)、不同气氛(氧化气氛、还原气氛)下CaO杂质对Al2O3和SiO2反应生成莫来石的影响。结果表明:1)氧化气氛下,CaO的引入可以促进莫来石的生成,当温度从1 350 ℃升高到1 600 ℃时,莫来石的生成量会逐渐增多。2)还原气氛下,CaO的引入不利于莫来石的生成,温度升高,莫来石生成量反而降低。3)Al2O3粒度越小,越易与SiO2凝胶粉反应生成莫来石。

关键词: CaO, 莫来石, 气氛, 温度, 粒度

Abstract: To broaden the application of SiO2 sol-bonded castables,using micro- or nano-Al2O3 powder and SiO2 gel powder as the main raw materials,the effects of CaO impurity on the formation of mullite from the reaction of Al2O3 and SiO2 at different temperatures (1 350,1 400,1 500,and 1 600 ℃) and in different atmospheres (oxidation atmosphere and reduction atmosphere) were studied.The results show that:(1)in oxidizing atmosphere,the introduction of CaO can promote the formation of mullite;when the temperature increases from 1 350 ℃ to 1 600 ℃,the formation of mullite gradually increases;(2)in reducing atmosphere,the introduction of CaO is not conducive to the formation of mullite,and the mullite formation decreases with the increasing temperature;(3)the smaller the particle size of Al2O3,the more easily it reacts with SiO2 gel powder to generate mullite.

Key words: calcia, mullite, atmosphere, temperature, particle size

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