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采用浸渍法在多孔氧化铝基板表面依次制备微孔过渡膜和超滤膜,形成具有梯度孔结构的陶瓷超滤膜。详细考察了浸浆次数和烧结温度对膜微观结构和孔径大小的影响。结果表明,通过二次涂膜,在多孔氧化铝基板表面获得了膜厚约30μm,孔径约200 nm的微孔过渡膜,其最佳烧结温度为1200℃;通过一次涂膜,在过渡膜表面获得了孔径小于3.6nm的超滤膜,其最佳烧结温度为1100℃。
The porous transitional membrane and the ultrafiltration membrane were sequentially prepared on the surface of the porous alumina substrate by impregnation method to form a ceramic ultrafiltration membrane with a gradient pore structure. The effects of the number of impregnation and the sintering temperature on the microstructure and pore size of the membrane were investigated in detail. The results show that the microporous transition membrane with a thickness of about 30μm and a pore size of about 200 nm can be obtained on the surface of a porous alumina substrate by the secondary coating. The optimal sintering temperature is 1200 ℃. An ultrafiltration membrane with a pore size of less than 3.6 nm was obtained. The optimum sintering temperature was 1100 ℃.