膜科学与技术

凝胶注模法制备多孔碳化硅支撑体

作者：卞强，张晗宇，范益群

单位：南京工业大学化学化工学院, 材料化学工程国家重点实验室, 南京 210009

关键词：多孔碳化硅陶瓷；凝胶注模；原位反应；高温气固分离

出版年,卷(期):页码： 2014,34(1):29-33

摘要：

以大颗粒碳化硅(SiC)为陶瓷骨料, 采用凝胶注模法制备支撑体生坯, 原位反应烧结制备大孔径、高渗透性的多孔SiC陶瓷支撑体, 主要考察了有机单体含量和烧结制度对高温气固分离用陶瓷膜支撑体性能的影响. 研究结果表明: 适宜的有机单体含量有助于SiC颗粒稳定分散在悬浮液中, 提高烧结温度和延长保温时间均可增加SiC颗粒的氧化程度, 在1550 oC时, XRD图谱显示莫来石相生成, 支撑体的抗弯强度有一定程度的提高. 采用凝胶注模法制备的生坯在1550 oC保温4 h烧结后具有良好的性能：抗弯强度为20.4 MPa, 孔隙率为37%, 平均孔径为23 μm, 气体渗透率为2.01×10-12 m2.

Porous silicon carbide(SiC) ceramics used for hot gas purification were prepared from SiC particle by an in-situ reaction, the ceramic green body was fabricated by gelcasting. This work mainly investigated the influences of monomer content and sintering procedure on the performance of porous SiC ceramic. The results indicate that the SiC particles dispersed stably in the slurry with suitable monomer content. The oxidation degree of SiC is raised with the sintering temperature and holding time increasing. The XRD analysis reveals the mullite is formed when the temperature reaches to 1550 oC which could obviously improve the flexural strength. Porous SiC ceramics with good properties can be prepared by gelcasting when sintered at 1550 oC for 4 h. The flexural strength, porosity, average pore size, and N2 permeability of the porous ceramics are about 20.4 MPa, 37%, 23 μm and of 2.01×10-12 m2, respectively.

卞强(1988-), 男, 江苏省张家港市人, 硕士, 从事膜分离材料的研究与应用. *通讯联系人

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