Abstract
Abstract Porous ceramic membranes have been widely studied recently owing to their outstanding thermal and chemical stability. In this paper, we investigate the preparation of an alumina coating over a diatomite-kaolin composite support layer in order to reliably tailor the porous coating structure and avoid defects, such as cracks. In particular, the effect of hydraulic pressure on the alumina coating was investigated using a flat-sheet membrane support. A flat-sheet diatomite-kaolin composite support filter was manufactured by an extrusion process. The characteristics of the membrane pores in an alumina coating on the diatomite-kaolin composite support layer were studied using scanning with electron microscopy, mercury porosimetry, and capillary flow porometer.
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