Cordierite body

Details Cordierite body Cordierite body

2005-11-22

2005-11-22

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S009000, C501S128000, C501S080000, C055S523000, C055SDIG003, C264S631000

Reissue Patent

active

RE038888

ABSTRACT:
A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg2Al4Si5O18and having a coefficient of thermal expansion (25-800° C.) of greater than 4×10−7/° C. and less than 13×10−7/° C. and a permeability and a pore size distribution which satisfy the relation 2.108 (permeability)+18.511 (total pore volume)+0.1863 (percentage of total pore volume comprised of pores between 4 and 40 micrometers)>24.6. The ceramic is suitable in the fabrication of cellular, wall-flow, diesel particulate filters having a pressure drop in kPa that at an artificial carbon soot loading of 5 grams/liter and a flow rate of 26 scfm is less than 8.9-0.035 (number of cells per square inch)+300 (cell wall thickness in inches), a bulk filter density of at least 0.60 g/cm3and a volumetric heat capacity of at least 0.67 J cm−3K−1as measured at 500° C.

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