Low back pressure porous cordierite ceramic honeycomb article and methods for manufacturing same

摘要

Disclosed are porous ceramic honeycomb articles, such as filters, which are composed predominately of a cordierite composition. The ceramic honeycomb articles possess a porous microstructure characterized by a unique combination of relatively high porosity (>45%), and moderately narrow pore size distribution wherein greater than 15% and less than 38% of the total porosity exhibits a pore diameter less than 10 mum, and low CTE wherein CTE<=6.0x10^-7/° C. (from 23° C. to 800° C.). The articles exhibit high thermal durability and high filtration efficiency coupled with low pressure drop. Such ceramic articles are particularly well suited for use in filtration applications, such as in diesel exhaust filters. Also disclosed are methods for manufacturing the porous ceramic honeycomb article.