摘要
以碳化硅(SiC)粉末为原料,氧化铝(Al2O3)和氧化钇(Y2O3)为添加剂,石墨粉、聚甲基丙烯酸甲酯(PMAA)为造孔剂,采用氧化烧结技术制备了多孔SiC陶瓷膜。采用XRD、SEM分析了多孔SiC陶瓷膜的物相组成及微观形貌,研究了造孔剂对多孔SiC陶瓷膜孔隙率、孔径分布、挠曲强度的影响。结果表明,PMAA作为造孔剂制备的P-SiC陶瓷膜具有良好的孔隙率、孔径分布、挠曲强度,孔隙率可达51%(质量分数)、平均孔径为0.69μm、挠曲强度为(28.04±0.48)MPa。XRD和SEM结果显示,P-SiC陶瓷膜主要晶相为SiC、Al2O3和YAlO3;P-SiC陶瓷膜中SiC晶体以球形颗粒为主,颗粒间间距均匀,颗粒与颗粒间相互结合形成牢固的多孔结构,颗粒直径大于气孔孔径。油水分离试验结果表明,试验开始前10 min,膜通量急速下降,50 min后,膜通量趋于稳定,达到平衡。当乳液流速为2 L/min、压力为2.0 bar时,P-SiC陶瓷膜稳态膜通量为726 L/(m^2·h),截留率为86.5%。
Porous SiC ceramic membranes were prepared by oxidation sintering process with SiC powder as raw material,alumina(Al2O3)and yttrium oxide(Y2O3)as additives,and graphite powder and polymethylmethacrylate(PMAA)as pore forming agents.The phase composition and microstructure of porous SiC ceramic membrane were analyzed by XRD and SEM.The effects of pore forming agent on porosity,pore size distribution and flexural strength of porous SiC ceramic membrane were studied.The results showed that the p-SiC ceramic membrane prepared by PMAA as pore forming agent had good porosity,pore size distribution and flexural strength.The porosity could reach 51 wt%,the average pore size was 0.69μm,and the flexural strength was(28.04±0.48)MPa.The results of XRD and SEM showed that the main crystalline phases of p-SiC ceramic membrane were SiC,Al2O3 and YAlO3,SiC crystal in p-SiC ceramic membrane was mainly spherical particles with uniform spacing.The particles were combined with each other to form a firm porous structure,and the particle diameter was larger than the pore size.The results of oil-water separation test showed that the membrane flux decreased rapidly in the first 10 min of the test,and stabilized and reached equilibrium after 50 min of the test.When the emulsion flow rate was 2 L/min and the pressure was 2.0 bar,the steady-state membrane flux of P-SiC ceramic membrane was 726 L/(m^2·h),and the retention rate was 86.5%.
作者
陈俐
CHEN Li(School of Civil Engineering,City College of Science and Technology, Chongqing University,Chongqing 402167, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第12期12204-12208,共5页
Journal of Functional Materials
基金
湖南科技大学页岩气资源利用湖南省重点实验室开放基金资助项目(E21721)。
关键词
SiC陶瓷膜
造孔剂
氧化烧结
油水分离
SiC ceramic membrane
pore forming agent
oxidation sintering
oil-water separation
