基于微结构的陶瓷管膜渗透性能研究

Permeability of Ceramic Membrane Based on Microstructure

针对挤压成型工艺自行制备的微孔陶瓷管,采用SEM、EDS、压汞法和光学接触角测量仪研究了微孔陶瓷管膜的形貌、组成及元素分布、孔径和孔隙率。根据微结构测量结果,采用数形结合的方法计算得到陶瓷管膜的渗透率,通过渗透率理论值和试验值对比分析了去离子水在微孔陶瓷管上渗透过程中驱动力的组成,并计算得到了迂曲度。结果表明,陶瓷管膜具有狭窄的孔径分布和均一的孔隙率,最可几孔径为38~39μm,孔隙率约为42%。液滴渗透过程的驱动力由液滴重力和毛细管力提供,其体积变化与时间的关系为V=-7.952 5 t+14.142。陶瓷管膜的渗透率和迂曲度分别为5.79μm2和1.90。

Morphology,composition and elemental distribution,and pore size and porosity of microporous ceramic tube membrane prepared by extrusion forming were investigated by SEM,EDS,mercury intrusion porosimetry（MIP）and optical contact angle measuring instrument.According to results of microstructure measurement,permeability of ceramic tube membrane was calculated by combination of number with shape method.Composition of driving force during permeation of deionized water on microporous ceramic tube and tortuosity were analyzed by comparison of theoretical and experimental results.The results indicate that microporous ceramic tube has homogeneous porosity and narrow pore size distribution.The most probable pore size is 38～39μm and porosity is about 42%.Driving force of droplet penetration process is provided by droplet gravity and capillary force,and the relationship between volume change and time is V=-7.952 5 t＋14.142.Ceramic membrane permeability and tortuosity is 5.79μm^2 and 1.90 respectively.