Preparation and characterization of porous YSZ--Al{2}O{3} composite membrane
YSZ-Al2O3多孔复合膜的制备和表征

YSZ--Al$_{2}$O$_{3}$ composite membranes with different composition were introduced to reduce the stress occurred during heat treatment, which could make the membrane have defects and microcracks. The degree of components and the thickness of the composite membrane were considered simultaneously. The data showed that linear expansion coefficient and sintered shrinkage increased with the increase of YSZ content. The sintered shrinkage was an important factor to choose the composition. Two composite membranes with 20\% (volume fraction) and 80\% of YSZ content were prepared. And the pore sizes of two composite membranes are 0.72 $\mu$m and 0.36 $\mu$m, respectively. The composite membrane is an excellent microfiltration membrane and a support for the preparation of YSZ ultrafiltration membrane and nanofiltration membrane.