Synthesis of Al2O3-SiO2-MgO ceramics with hierarchical porous structure

作     者：Elena F.KRIVOSHAPKINA Pavel V.KRIVOSHAPKIN Aleksey A.VEDYAGIN 

作者机构：Institute of Chemistry of Komi SC UB RAS Syktyvkar 167982 Russia ITMO University St.Petersburg 197101 Russia Boreskov Institute of Catalysis SB RAS Novosibirsk 630090 Russia National Research Tomsk Polytechnic University Tomsk 634050 Russia 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2017年第6卷第1期

页      面：92-页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financial support of the Russian Foundation of Basic Research the Russian Academy of Sciences and Federal Agency of Scientific Organizations 

主　　题：sol–gel method aerogels cordierite Al 2 O 3 –SiO 2 –MgO hierarchical porous structure 

摘      要：A series of asymmetric cordierite ceramics with hierarchical porous structure were prepared and characterized. The macroporous support was obtained from natural raw materials (bauxite, silica sand, kaolinite, talc, and alumina) via ceramic technology. The prepared ceramic discs were characterized by a narrow pore size distribution. The average pore size was about 9.5 μm, and the open porosity was estimated to be 30%. Coating the discs with micro/mesoporous cordierite layer was performed using the sol–gel approach. Three-component sols were obtained from organic or inorganic precursors. Corresponding gels were calcined at 1200 °C to form the cordierite structure. The nature of precursor was found to affect the pore volume distribution. Narrow pore volume distribution was observed when organic precursors were used. Another key factor to control the parameters of final material was the drying condition. Supercritical drying of the gels has allowed us to increase the surface area in two orders of magnitude comparing with conventional drying procedure.