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
分类号: TQ174
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.

基金项目:
国家“863”计划课题(2012AA03A606)、江苏高校优势学科建设工程资助项目

作者简介:
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

参考文献:
[1]任祥军, 程忠勇, 孟广耀, 等. 陶瓷膜用于气固分离的研究现状和前景[J]. 膜科学与技术, 2005, 25(2): 65-68.
[2]Pastila P, Helanti V, Nikkila A, et al. Environmental effects on microstructure and strength of SiC-based hot gas filters[J]. Journal of the European Ceramic Society, 2001, 21(9): 1261-1268.
[3]徐南平, 邢卫红, 赵宜江. 无机膜分离技术与应用[M]. 北京: 化学工业出版社, 2003.
[4]李俊峰, 林 红, 李建保. 碳化硅多孔陶瓷气孔率和强度影响因素[J]. 无机材料学报, 2011, 26(9): 944-948.
[5]刘有智, 石国亮, 郭 雨, 等. 新型多孔碳化硅陶瓷膜管的制备与性能表征[J]. 膜科学与技术, 2007, 27(1): 32-34.
[6]Isobe T, Ooyama A, Shimizu M, et al. Pore size control of Al2O3 ceramics using two-step sintering[J]. Ceramics International, 2012, 38(1): 787-793.
[7]张 锐, 高 濂, 程国锋, 等. 注浆成型SiC多孔陶瓷的工艺和性能研究[J]. 无机材料学报, 2002, 17(4): 725-730.
[8]Zhou Y, Fukushima M, Miyazaki H, et al. Preparation and characterization of tubular porous silicon carbide membrane supports[J]. Journal of Membrane Science, 2011, 369(1-2): 112-118.
[9]Park J K, Lee J S, Lee S I. preparation of porous cordierite using gelcasting method and its feasibility as a filter[J]. Journal of Porous Materials, 2002, 9(3): 203-210.
[10]Yi Z Z, Xie Z P, Huang Y, et al. Study on gelcasting and properties of recrystallized silicon carbide[J]. Ceramics International, 2002, 28(4): 369-376.
[11]Omatete O O, Janney M A, Strehlow R A, et al. Gelcasting-a new ceramic forming process[J]. American Ceramic Society Bulletin, 1991, 7(10): 1641-1649.
[12]Young A C, Omatete O O, Janney M A, et al. Gelcasting of alumina[J]. Journal of the American Ceramic Society, 1991, 74(3): 612–618.
[13]Gilissen R, Erauw J P, Smolders A, et al. Gelcasting, a near net shape technique[J]. Materials & Design, 2000, 21(4):251-257.
[14]Vandeperre L J, De Wilde A M, Luyten J. Gelatin gelcasting of ceramic components[J]. Journal of Materials Processing Technology, 2003, 135(2-3): 312-316.
[15]Yang J L, Yu J L, Huang Y. Recent developments in gelcasting of ceramics[J]. Journal of the European Ceramic Society, 2011, 31(14): 2569-2591.
[16]沈云进. 氧化铝/碳化硅陶瓷复合膜的制备与性能考察[D]. 南京: 南京工业大学, 2012.
[17]Zhang T, Zhang Z Q, Jiang D L, et al. Preparation of SiC ceramics by aqueous gelcasting and pressureless sintering[J]. Materials Science & Engineering A, 2007, 43(1-2): 257-261.
[18]Ding S Q, Zeng Y P, Jiang D L. In-situ reaction bonding of porous SiC ceramics[J]. Materials Characterization, 2008, 59(2): 140-143.
[19]Kumar M, Eom J H, Kim Y W, et al. Effect of aluminum hydroxide content on porosity and strength of porous mullite-bonded silicon carbide ceramics[J]. Journal of the Ceramic Society of Japan, 2011, 119(5): 367-370.
[20]董应超. 新型低成本多孔陶瓷分离膜的制备与性能研究[D]. 合肥: 中国科学技术大学, 2008.

服务与反馈:
文章下载】【加入收藏

《膜科学与技术》编辑部 地址:北京市朝阳区北三环东路19号蓝星大厦 邮政编码:100029 电话:010-80492417/010-80485372 传真:010-80485372邮箱:mkxyjs@163.com

京公网安备11011302000819号