二氧化硅基多孔块材的制备及其热稳定性

doi:10.3724/SP.J.1077.2011.00949

无机材料学报 ›› 2011, Vol. 26 ›› Issue (9): 949-954.DOI: 10.3724/SP.J.1077.2011.00949

二氧化硅基多孔块材的制备及其热稳定性

张丽杰¹, 谷景华¹, 姚红英², 张跃¹

(1. 北京航空航天大学材料科学与工程学院, 空天材料与服役教育部重点实验室, 北京100191; 2. 复旦大学物理系, 上海200433)

收稿日期:2010-10-25 修回日期:2010-12-20 出版日期:2011-09-20 网络出版日期:2011-08-19
作者简介:张丽杰(1986-), 女, 硕士研究生. E-mail: lijiesany@yahoo.cn
基金资助:
国家自然科学基金(51072010)

Preparation and Thermal Stability of Porous Silica-based Monoliths

ZHANG Li-Jie¹, GU Jing-Hua¹, YAO Hong-Ying², ZHANG Yue¹

(1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China; 2. Department of Physics, Fudan University, Shanghai 200433, China)

Received:2010-10-25 Revised:2010-12-20 Published:2011-09-20 Online:2011-08-19
Supported by:
National Natural Science Foundation of China (51072010)

摘要/Abstract

摘要： 以非离子型表面活性剂P123和三甲基苯的微乳液为模板剂合成介孔SiO₂粉体. 以此粉体为原料, 经干压成型、烧结制备多孔SiO₂块材. 分别用AlOOH溶胶和TiO₂溶胶包覆多孔SiO₂粉体, 制成多孔SiO₂/Al₂O₃块材和SiO₂/TiO₂块材. 采用XRD、SEM、TEM、N₂吸附法和阿基米德排水法对所制粉体和块材进行了表征, 并研究了块材的热稳定性. 结果表明, 600~700℃烧结的多孔SiO₂基块材的孔隙率为74%~76%. 与多孔SiO₂块材相比, 在800~1000℃范围内, SiO₂/Al₂O₃块材的热稳定性显著提高, SiO₂/TiO₂块材的热稳定性在800~900℃范围内有一定改善.

关键词: 多孔块材, 介孔, 二氧化硅, 热稳定性, 三氧化二铝

Abstract: Porous monoliths with high porosity and improved high temperature stability are required in heat insulation. Mesoporous SiO₂ powder was synthesized from tetraethyl orthosilicate using oil-in-water microemulsions composed of non-ionic surfactant P123 and 1,3,5-trimethylbenzene as template. Porous SiO₂ monoliths were prepared from the mesoporous SiO₂ powder by dry pressing followed by sintering. Porous SiO₂/Al₂O₃monoliths and SiO₂/TiO₂ monoliths were prepared from mesoporous SiO₂ powders coated with boehmite Sol and titania Sol respectively. XRD, SEM, TEM, N2 adsorption and Archimedes method were employed to characterize the powders and the monoliths. The thermal stability of the monoliths was studied. The porosity of the silica-based monoliths sintered at 600-700℃ is about 74%?76%. Compared with SiO₂ monolith, porous SiO₂/Al₂O₃monolith has much better thermal stability at 800-1000℃ and porous SiO₂/TiO₂ monolith has an improved thermal stability at 800-900℃. It is indicated that alumina coating on porous silica particle surface can improve the high temperature stability of SiO₂/Al₂O₃ monolith.

Key words: porous monolith, mesoporous, silica, thermal stability, alumina

中图分类号:

TQ174

张丽杰, 谷景华, 姚红英, 张跃. 二氧化硅基多孔块材的制备及其热稳定性[J]. 无机材料学报, 2011, 26(9): 949-954.

ZHANG Li-Jie, GU Jing-Hua, YAO Hong-Ying, ZHANG Yue. Preparation and Thermal Stability of Porous Silica-based Monoliths[J]. Journal of Inorganic Materials, 2011, 26(9): 949-954.

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二氧化硅基多孔块材的制备及其热稳定性

Preparation and Thermal Stability of Porous Silica-based Monoliths

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