耐火材料 ›› 2021, Vol. 55 ›› Issue (5): 448-451.DOI: 10.3969/j.issn.1001-1935.2021.05.016

• 生产应用 • 上一篇    下一篇

熔盐造孔法制备六铝酸钙多孔材料

康国卫(), 刘苗伟, 杨亚峰, 刘新红, 贾全利()   

  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:2021-07-18 出版日期:2021-10-15 发布日期:2021-10-25
  • 通讯作者: 贾全利,男,1972年生,博士,教授。E-mail: jiaquanli@zzu.edu.cn
  • 作者简介:康国卫:男,1996年生,硕士研究生。E-mail: 1803720882@qq.com

Preparation of calcium hexaaluminate porous materials by molten salt pore-forming method

Kang Guowei(), Liu Miaowei, Yang Yafeng, Liu Xinhong, ()   

  1. Henan Key laboratory of High Temperature Functional Ceramics,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450052,Henan,China
  • Received:2021-07-18 Online:2021-10-15 Published:2021-10-25
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摘要:

为探究熔盐的加入对六铝酸钙(CA6)多孔材料性能的影响,以工业CaCO3为钙源,α-Al2O3为铝源,添加KCl熔盐,经1 400、1 500、1 600 ℃保温3 h高温烧成制备了六铝酸钙(CA6)多孔材料。结果表明:1)KCl的加入不仅作为造孔剂造孔,而且还降低了CA6生成温度和促进CA6片状晶粒的生长;2)当烧成温度为1 500 ℃,铝钙质原料与KCl的质量比为4∶1时,所制备的CA6多孔材料显气孔率为59.42%,耐压强度为46.15 MPa,1 000 ℃ 时热导率为1.02 W·m-1·K-1,孔径主要分布在5~15 μm,平均孔径约为10 μm,孔面积占比64%,材料内部孔隙分布较为均匀,综合性能较好。

关键词: 六铝酸钙, 多孔材料, 熔盐法, 热导率

Abstract:

To explore the effect of the molten salt addition on their properties,calcium hexaaluminate (CA6) porous materials were prepared using industrial CaCO3 as the calcium source and α-Al2O3 as the aluminum source,adding molten salt of KCl and firing at 1 400,1 500,and 1 600 ℃ for 3 h.The results show that the KCl addition not only plays as a pore-forming agent,but also reduces the formation temperature of CA6 and promotes the growth of CA6 flake grains.With the firing temperature of 1 500 ℃ and the mass ratio of CaCO3 and α-Al2O3 to KCl=4∶1,the prepared CA6 porous material has the apparent porosity of 59.42%,the compressive strength of 46.15 MPa,the thermal conductivity of 1.02 W·(m·K)-1 at 1 000 ℃,the main pore diameter distribution at 5-15 μm,the average pore size of 10 μm and the pore area ratio of 64%,showing relatively uniform distribution of internal pores and good comprehensive performance.

Key words: calcium hexaaluminate, porous materials, molten salt method, thermal conductivity

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