Ceramic articles having a nonporous core and porous outer layer

摘要

Fired ceramic article, which exhibits a uniform, porous sheath and a core. The porous sheath or outer layer of the article can be filled with various infiltrates, e.g., catalysts, in order to provide the article with useful properties. The article can be prepared by treating a fired ceramic article with a leachant, e.g., hydrofluoric acid or a precursor thereof.