Cordierite aluminum magnesium titanate compositions and ceramic articles comprising same
First Claim
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1. A ceramic article, comprising:
- a honeycomb monolith structure having an inlet end and an outlet end, and a multiplicity of cells formed by walls extending from the inlet end to the outlet end, wherein each of the walls of the honeycomb monolith structure comprises;
at least about 50 wt % of a pseudobrookite phase comprising predominately alumina, magnesia, and titania;
a second phase comprising cordierite; and
a sintering aid;
wherein the article has a composition, as expressed in weight percent on an oxide basis, of from 4% to 10% MgO;
from 40% to 55% Al2O3;
from 25% to 44% TiO2; and
from 5% to 25% SiO2, andwherein the honeycomb monolith structure further comprises;
median pore diameter d50 of at least 10 μ
m, anddf that does not exceed 0.50.
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Abstract
Disclosed are ceramic bodies comprised of composite cordierite aluminum magnesium titanate ceramic compositions and methods for the manufacture of same.
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Citations
24 Claims
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1. A ceramic article, comprising:
a honeycomb monolith structure having an inlet end and an outlet end, and a multiplicity of cells formed by walls extending from the inlet end to the outlet end, wherein each of the walls of the honeycomb monolith structure comprises; at least about 50 wt % of a pseudobrookite phase comprising predominately alumina, magnesia, and titania; a second phase comprising cordierite; and a sintering aid; wherein the article has a composition, as expressed in weight percent on an oxide basis, of from 4% to 10% MgO;
from 40% to 55% Al2O3;
from 25% to 44% TiO2; and
from 5% to 25% SiO2, andwherein the honeycomb monolith structure further comprises; median pore diameter d50 of at least 10 μ
m, anddf that does not exceed 0.50. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A ceramic article, comprising:
a honeycomb monolith structure having an inlet end and an outlet end, and a multiplicity of cells formed by porous walls extending from the inlet end to the outlet end, wherein the porous walls of the honeycomb monolith structure further comprise; at least about 50 wt % of a pseudobrookite phase comprising predominately alumina, magnesia, and titania and including 15 wt % to 35 wt % of MgTiO5; a second phase comprising cordierite; a third phase comprising mullite, and wherein the porous walls of the honeycomb monolith structure comprise a composition, as expressed in weight percent on an oxide basis, of from 4% to 10% MgO;
from 40% to 55% Al2O3;
from 25% to 44% TiO2; and
from 5% to 25% SiO2, andwherein the honeycomb monolith structure further comprises; a coefficient of thermal expansion, as measured between 25°
C.-1000°
C., of less than or equal to 14×
10−
7/°
C.;total porosity % P of at least 40% by volume; median pore diameter d50 of at least 10 μ
m; anddf that does not exceed 0.50.
Specification