High porosity filters for 4-way exhaust gas treatment
AssigneeCorning Incorporated
InventorsIsabelle Marie Melscoet-Chauvel, Gregory Albert Merkel, Steven Bolaji Ogunwumi, Tinghong Tao, Jianguo Wang
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Abstract
Cordierite ceramic articles with high volume percent porosities of at least 64% but less than 80% have controlled median pore sizes and mean coefficients of thermal expansion that impart substantially improved modulus of rupture strengths (MOR) and thermal shock resistance (TSR) to the ceramic articles.
Claims8
A cordierite ceramic article having at least 64% porosity and less than 80% porosity, a median pore diameter (d50) of at least 10 μm and not more than 45 μm, a mean CTE (25-800° C.) in the axial direction wherein 0.5(d50-24.0)<CTE (25-800° C.)<0.5(d50-5.0) wherein d50 is expressed in micrometers and CTE (25-800° C.) is expressed in units of 10−7/° C., and a modulus of rupture MOR flexural strength of at least 500 psi as measured on a non-cellular rod or bar, or a ratio of modulus of rupture strength /closed frontal area MOR/CFA of at least 500 psi as measured on a cellular bar.
Dependencies are inferred from the claim text.