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Mesoporous Al 2 O 3 -SiO 2  ceramics were prepared by one-pot method. In this process, aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) 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 200m 2 /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.

Effect of Microwave Sintering on Morphology and Structure of Porous Al2O3-SiO2 Ceramics

Effect of Microwave Sintering on Morphology and Structure of Porous Al₂O₃-SiO₂ Ceramics