Cordierite honeycomb article and method of manufacture

Abstract

Disclosed are ceramic honeycomb articles which are composed predominately of a crystalline phase cordierite composition. The porous cordierite ceramic honeycomb articles has a plurality of cell channels and intersecting porous walls and possess a microstructure characterized by a pore size distribution wherein greater than or equal to 75% of the pore size distribution of the porosity of the porous walls, by volume, have a pore diameter (dv) wherein dv<10.0 μm and less than or equal to 35% of the pore size distribution have dv≦4.0 μm. Additionally, the pore diameter dv90≦14.0 μm, and CTE≦12.0×10−7/° C. from 25° C. to 800° C. The articles exhibits high filtration efficiency coupled with low pressure drop across the filter. Additionally, high porosity articles having porosity greater than or equal to 40% and low surface roughness of Ra<4.0 μm are described. Additionally, a method for manufacturing the ceramic honeycomb articles wherein fine talc, fine silica-forming source and a fine pore former are disclose.

Dependencies are inferred from the claim text.