Patent ID: 7618699

Claim:
A porous ceramic honeycomb structure, comprising: a primary cordierite ceramic phase exhibiting low microcracking and cordierite crystallite orientation and having a room temperature elastic modulus (E RT ), room temperature modulus of rupture strength (MOR RT ), and high temperature (500-900° C.) thermal expansion coefficient (CTE H ) such that a thermal shock parameter (TSP) of the structure calculated as: TSP=MOR RT /[E RT ][CTE H ] is at least 400° C.; CTE (25-800° C.)≦15×10 −7 /° C.; a total porosity ≧46%; and wherein low microcracking is characterized by an E ratio ≦1.05, wherein E ratio =E H /E RT and (E H ) is a high temperature (1000° C.) elastic modulus.