Abstract
Mesoporous Al2O3-SiO2 ceramics were prepared by one-pot method. In this process, aluminum chloride hexahydrate (AlCl3·6H2O) and tetraethyl orthosilicate (TEOS) acted as the common precursors, and then the composite porous ceramics were obtained by vacuum freeze-drying (FD). Subsequently, the samples were sintered at 800°C, 1000°C and 1200°C by muffle furnace and microwave sintering device (MSD) respectively, and the crystalline transformation process has been characterized by X-ray powder diffraction (XRD). Furthermore, the properties of porous materials were characterized by Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that the sintered samples still retain super high specific surface area (over 200m2/g), and microwave sintering can greatly reduce the crystallization temperature of porous alumina ceramics. This rapid sintering method also transforms porous ceramics from leaf-like structure to granular structure, and finally forms nanorod structure. The sintering mechanism was explained from the point of view of crystal growth law.
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