Strontium feldspar aluminum titanate for high temperature applications
AssigneeCorning Incorporated
InventorSteven B. Ogunwumi
Life of this patent
Estimating the term…
Abstract
A structure for use in high temperature applications and including a porous ceramic material consisting essentially of about 50-90 percent by weight iron or magnesium stabilized aluminum titanate (AlTiO5) and about 10-50 percent by weight strontium feldspar (SrO.Al2O3.2SiO2), and having a coefficient of thermal expansion over a temperature range from room temperature to 1000° C. of about −10×10−7/° C. to +15×10−7/° C., a heat capacity at 500° C. greater than 3.2 J/cm3K, a porosity of about 15-50 percent by volume, preferably 40-50 percent by volume, and a median pore size of about 5-50 micrometers, preferably 8-15 micrometers. The structure is especially useful as a diesel exhaust particulate filter.
Claims20
A structure comprising a porous ceramic material consisting essentially of about 50-90 percent by weight aluminum titanate (AlTiO5) and about 10-50 percent by weight strontium feldspar (SrO.Al2O3.2SiO2),
- wherein the aluminum titanate is stabilized by iron (Fe) or magnesium (Mg), the substitution of iron or magnesium into the aluminum titanate phase being at 0-60 mole %;
- and,
- wherein the structure has a coefficient of thermal expansion over a temperature range from room temperature to 1000° C. of about −10×10−7/° C. to +15×10−7/° C., a heat capacity at 500° C. of greater than 3.2 J/cm3K, a porosity of about 15-50 percent by volume, and a uniform pore size distribution with a median pore size of about 5-50 micrometers.
A diesel exhaust particulate filter comprising a plugged, wall-flow honeycomb filter body composed of porous ceramic material and comprising a plurality of parallel end-plugged cell channels traversing the body from a frontal inlet end to an outlet end thereof, wherein:
- the ceramic consists essentially of 50-90 percent by weight aluminum titanate (AlTiO5) and about 10-50 percent by weight strontium feldspar (SrO.Al2O3.2SiO2),
- wherein the aluminum titanate is stabilized by iron (Fe) or magnesium (Mg), the substitution of iron or magnesium into the aluminum titanate phase being at 0-60 mole %.
Dependencies are inferred from the claim text.