Selective Leaching for the Preparation of Functional Porous Ceramics

Abstract

Preparation of various porous ceramics by selective leaching method and their properties were summa rized and reviewed in this paper. Porous ceramics can be prepared utilizing variety of composite microtextures and crystal structures. Using interconnected microtexture in phase separated glasses formed by spinodal decomposition, porous glasses have been prepared and used for filter materials because they have crack free piercing pores in uniform size and good mechanical strength. Porous materials can be also prepared using nanocomposite microtextures formed by phase separation, crystallization and etc. In these porous materials, pores were formed by selective leaching of amorphous matrix. Since very fine nanocrystalline grains were spatially separated and exposed in the surface of pores, various interesting prop erties were obtained. Porous materials with unique porous properties can be prepared by selective leaching method from crystals with characteristic structures such as chain, layered and framework utilizing solubility difference in various components.