Preparation and Characterization of Al₂O₃-Based Composite Membranes by Sol-Gel Method

Abstract:

Porous Al₂O₃-SiO₂-ZrO₂ ceramic composite membranes were fabricated by the sol-gel method. The effects of constitution of the composite sol, dip-coating parameters and calcination parameters on the morphology, phase composition, pore size distribution and BET surface area of the membranes were investigated extensively. The thermogravimetric analysis (TGA)/differential scanning calorimeters (TG/DSC), scanning Electron Microscopy (SEM), XRD analysis and N₂ adsorption-desorption analysis was employed for the membranes characterization. TG/DSC curve shows that the suitable calcination temperature of Al₂O₃-SiO₂-ZrO₂ membranes is 1000°C. The SEM morphology displays a smooth and free-crack layer of Al₂O₃-SiO₂-ZrO₂ composite membranes on the surface of the support after calcination at 1000°C. Furthermore, the membranes were also successfully coated with a good adhesion to the support. The optimal composite membranes were obtained when the moral ratio of Al₂O₃-SiO₂-ZrO₂ was 10:2.3:1, the dip-coating parameters were four times dip-coating with every time of 60s respectively.

• Periodical: Key Engineering Materials (Volume 655)
• Pages: 108-113
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.655.108
• Online since: July 2015
• Authors: Rui Ping Liu, Wei Ming Su, Chang An Wang*
• Keywords: Al₂O₃-SiO₂-ZrO₂, Ceramic Membranes, Dip-Coating, Sol-Gel Process

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