High porosity honeycomb and method

Details High porosity honeycomb and method High porosity honeycomb and method

2003-09-30

2008-10-28

Speer, Timothy M. (Department: 1794)

Stock material or miscellaneous articles

Structurally defined web or sheet

Honeycomb-like

C422S180000, C422S177000, C264S044000, C264S630000, C264S631000, C428S117000

Reexamination Certificate

active

07442425

ABSTRACT:
A ceramic honeycomb substrate for use in an automotive catalytic converter system which exhibits improved light-off performance by virtue of a high porosity of 45 to 75% while still maintaining a wall thickness of greater than 2.0 mil (0.0020 inch, 0.0508 mm), preferably 2.5 mil (0.0025 in., 0.0635 mm) to 7 mil (0.0070 in., 0.1778 mm), and more preferably 2.5 mil (0.0025 in., 0.0635 mm) to 3 mil (0.0030 in., 0.0762 mm). The median pore size is in the range of 2-10 micrometers, and a coefficient of thermal expansion (CTE) (25-800° C.) of less than 15×10−7/° C.

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