无机材料学报2011，Vol.26Issue(9)：949-954,6.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
Preparation and Thermal Stability of Porous Silica-based Monoliths
摘要
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/Al2O3 monoliths 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/Al2O3 monolith 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.关键词
多孔块材/介孔/二氧化硅/热稳定性/三氧化二铝Key words
porous monolith/ mesoporous/ silica/ thermal stability/ alumina分类
化学化工引用本文复制引用
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):949-954,6.基金项目
国家自然科学基金(51072010) （51072010）
