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Preparation and Characterization of SiC Ceramic Composite Filtration Membrane materials

Authors： SU Kui-fan1, DENG Xiang-yun1.2 , LI Jian-bao1., WANG Chun-peng1,ZHAN Guo-qin1, JiING Ya-ni1,BAI, Cheng-ying

Units： 1.Key Laboratory Advanced Materials of Tropical Island Resources, Ministry of Education; Hainan Provincial Key Laboratory 0f Re search on Utilization of Si-Zr-Ti Resources，Materials and Chemical Engineering Institute, Hainan University, Haikou, Hainan 570228，China 2.College of Physics and Electronic Information，Tianjin Normal University， Tianjin 300387，China)

KeyWords： silicon carbide, filtration membrane, ceramic fiber layer, tape casting, porosity, pore size

ClassificationCode：TQ174

year,volume(issue):pagination： 2013,33(2):18-23

Abstract：

Various compositions of ceramic fiber slurry were prepared to discuss the influence of ceramic fiber layer on structure of SiC filtration membrane ,effect of bonding agents on porosity and pore size distribution of filtration membrane, when bonding agentss at 15wt%,,effect of pore-forming agent on porosity of filtration membrane. Tape casting method was used to prepare the filtration membrane covering on the SiC green body. And XRD and SEM were performed to examine the phase constitution and morphology. The porosity and pore size distribution of filtration membrane were tested by Archimedes method and bubble point method respectively. The results show that, there is a SiO2 diffraction peak with the 2θ =22°in the filtration membrane sample sintered at 1300℃ for 3h. When the composition of ceramic fiber slurry in mass ratio of aluminum silicate fibers: mullite fibers: CMC: water is 1: X（X=0,0.5,1.0,1.5）: 1.5: 65, and 0≤X≤1.0, the SiC ceramic filtration membrane becomes more uniform and complete with the increasing content of mullite fibers. Meanwhile, ceramic fiber layer can prevent the filtration membrane falling into the gaps of SiC support body. While X﹥1.0(X=1.5), excess mullite fibers lead a bad adhesive quality of SiC support body and filtration membrane. X=1.0 is an appropriate content of mullite fibers, and the whole complex SiC ceramic filtration system has a perfect structure. However, if there is not any ceramic fiber layer, the filtration membrane drops into the gaps of SiC support body easily which has an impact on the structures and properties of complex SiC ceramic filtration membrane material.When the content of bonding agents increased from 5wt% to 25%, however, the porosity dropped from 46% to 29% and average pore size decreased from 11.916μm to 4.017μm. The porosity was changed from 41% to 60% with the amount of bonding agents was fixed at 15% but the content of pore-forming agents became from 5wt% to 25%.

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