High porosity cordierite ceramic honeycomb article and method

Details High porosity cordierite ceramic honeycomb article and method High porosity cordierite ceramic honeycomb article and method

2005-12-21

2009-06-02

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Pore-forming

C501S081000, C501S082000, C501S119000, C264S043000, C264S044000, C264S631000

Reexamination Certificate

active

07541303

ABSTRACT:
The present invention provides materials and methods for the manufacture of high porosity ceramic exhaust filters employing relatively low amounts of pore formers, the filters combining efficient diesel particulate filtration with effective support for exhaust emissions control catalysts. Cordierite-forming ceramic batches comprising non-hydrated transition alumina powders of relatively large particle size provide high porosities with well-controlled pore sizes and with low filter thermal expansion coefficients and good mechanical strengths.

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