The press-sintering process was developed to prepare Al~2O~3 microporous ceramics, and these ceramics were coated with Al~2O~3, ZrO~2 and TiO~2 membrane by sol-gel method to obtain the unsymmetrical composite ceramics membranes in this paper. In the press-sintering process, the powder was agglomerated, and the w(PVA) was controlled at 15%, 25% and 30%, the agglomerated powder was 10μm is size, then pressed and sintered at 1250℃, and microporous ceramics with pore diameter of 2μm, 6μm and 10μm, open pore ratio higher than 40%, crushing strength of 50N could be achieved. Using the microporous ceramics with pore diameter of 2μm, 6μm and 10μm as substrate, sol-gel concentration of 0.5g/mL (salt), the substrates were dried slowly at 25℃ and 80℃ successively, then sintered at 1000℃, the unsymmetrical composite ceramics membranes with pore diameter of 200nm, 400nm and 600nm, thickness of about 40μm could be developed by the sol-gel method. The membranes can be used as filter for gas or liquid, especially be used as substrate for Pd-Ag alloy membrane.

Key words: LAMINATED FILMS, CERAMICS, SOL-GEL PROCESS, CLINKERING, ALUMINIUM OXIDE, ZIRCONIUM OXIDE