压汞法在氧化铝陶瓷膜制备中的应用

Application of mercury intrusion method in manufacturing the alumina membrane

用压汞法测定非对称氧化铝（Al2O3）陶瓷膜从原料粉到支撑体和成品膜制备过程中各阶段样品的孔径及其分布、孔隙率和密度等参数,并与扫描电子显微镜（SEM）的结果进行比较。研究表明,用压汞法测定原料粉体粒子间的孔的孔径及其分布与支撑体中孔的孔径及其分布一致,其最可几孔径与理论计算结果接近,因此可以通过压汞法测定原料粉粒子间的孔的孔径及其分布来预测陶瓷膜支撑体的孔径及其分布。用压汞法测定非对称Al2O3陶瓷膜,可以直观地看出膜中多孔支撑体、过渡层和分离层各层的孔径及其分布。结合SEM的测试结果,压汞法对陶瓷膜生产过程中各样品的孔径及其分布、孔隙率、体积密度等进行了量化,合理解释了陶瓷膜生产中结构与性能的变化规律,可以用于指导陶瓷膜的生产。

The interparticle pore size distribution,interparticle porosity,and volume density of the alumina（Al2O3） powder are characterized by mercury intrusion method.The pore size distribution,porosity,volume density of the Al2O3 support layer and asymmetrical Al2O3 membrane are also characterized by this method.It shows that the interparticle pore size distribution of the Al2O3 powder particles is consistent with the pore size distribution of the support layer,and the most probabilistic pore diameter of the powder is identical to the theoretical calculated pore size value.So it is possible to forecast the pore size distribution of support layer by determining the interparticle pore size distribution of Al2O3 powder with mercury intrusion method.Moreover,when the asymmetrical Al2O3 membrane is analyzed by mercury intrusion method,the pore size distributions of support layer,interlay and separated layer can be directly observed and calculated.Combined with the scanning electron microscopy（SEM） image results,the pore size distribution,porosity,volume density of those samples produced from the membrane manufacture process can be quantified.The relationship between the structure and properties of the Al2O3 membrane can be reasonably elucidated by the mercury intrusion method.It is instructive to the Al2O3 membrane production.