Abstract: A process based on the suspended particle technique was used to deposit Al₂O₃ micro-filtration membranes on α-Al₂O₃ support,α-Al₂O₃ supports with four different pore sizes were analyzed.The effects of surface roughness, pore size of support and matching condition between support pore size and suspension particle size on the integrity of micro-filtration membranes were discussed.The results showed that an integral crack-free membrane could be made with smooth support surface and fine matching between suspension particle size and support pore size.The test data showed that the limiting ratio between support pore size and suspension particle size was 10.When the ratio was more than 10,the membrane thus made would have surface cracks, wide distribution of pore size and small porosity.When the ratio was less than 10,the membrane thus made would have crack free surface, narrow of distribution of pore size and large porosity.

Key words: 支撑体, 微滤膜, 完整性, 孔径大小

关键词: 支撑体, 微滤膜, 完整性, 孔径大小