Patent ID: 8377370

Claim:
A method for making a porous ceramic honeycomb body, the method comprising: providing a plasticized ceramic forming precursor batch composition, comprising: an inorganic powder batch composition comprising: an inorganic powder batch mixture comprising a magnesium source having a median particle size diameter D 50 less than or equal to 15 microns, an alumina forming source having a median particle size diameter D 50 less than or equal to 8 microns, and a silica forming source having a median particle size diameter D 50 less than or equal to 15 microns at least 0.5 wt % of at least one glass forming metal oxide source comprising an yttrium source, a lanthanum source, or a combination thereof; an organic binder; a pore-forming agent present in a sufficient amount to achieve a porosity of at least 50% in the resulting fired honeycomb body; and a liquid vehicle present as a super addition in an amount of from 15 to 60 wt % of the inorganic powder batch composition; forming a honeycomb green body from the precursor batch composition; and firing the honeycomb green body to form the porous ceramic honeycomb body comprising a primary cordierite ceramic phase having a median pore size diameter d 50 less than 7.9 microns; an elastic modulus ratio E 900° C. /E 25° C . of not greater than 1.01; and a thermal shock parameter (TSP) of at least 450° C.; where TSP is (MOR 25° C. /E 25° C. )(CTE 500-900° C. ) −1 , MOR 25° C. /E 25° C . is at least 0.14×10 −2 (0.14%), MOR 25° C . is the modulus of rupture strength at 25° C., E 25° C . is the Young's elastic modulus at 25° C., E 900° C . is the elastic modulus at 900° C. measured during heating, and CTE 500-900° C . is the high temperature thermal expansion coefficient at from about 500° C. to 900° C. during heating.