US US2004148916A1
A cordierite ceramic body having (i) a pore size distribution and a porosity which satisfy the relationship 10.2474/[(d50)<2>(pore fraction)]+0.0366183(d90)-0.00040119(d90)<2>+0.468815(1/pore fraction)<2>+0.0297715(d50)+1.61 639(d50-d10)/d50<=3.65, and (ii) a CTE (25°-800° C.) of <=15X10<-7>/° C., wherein the cordierite ceramic body is produced from a moldable mixture comprising cordierite-forming raw materials including (a) a fine talc having a median particle diameter, as measured by laser diffraction, of less than 10 micrometers, and a B.E.T. specific surface area of greater than 5 m<2>/g, and (b) a pore former. The cordierite ceramic body is suitable in the fabrication of cellular, wall-flow diesel particulate filters having a low pressure drop, high filtration efficiency and improved strength.
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