Cordierite body
USRE38888E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2003 |
| Grant date | Nov 22, 2005 |
| Priority date | — |
| Expiry date | Sep 22, 2023 |
Classification
- Technology area (CPC —)General
Abstract
A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg2Al4Si5O18 and 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/cm3 and a volumetric heat capacity of at least 0.67 J cm−3 K−1 as measured at 500° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.