Cordierite aluminum magnesium titanate compositions and ceramic articles comprising same
First Claim
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1. A ceramic article comprising a first crystalline phase comprised predominantly of a solid solution of aluminum titanate and magnesium dititanate and a second crystalline phase comprising cordierite, the article having 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 35% TiO2;
from 5 to 25% SiO2, and a metal oxide sintering aid, wherein the ceramic article comprises a total porosity % P greater than 40% by volume and a coefficient of thermal expansion, as measured between 25-1000°
C., of less than or equal to 15×
10−
7/°
C.
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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
10 Claims
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1. A ceramic article comprising a first crystalline phase comprised predominantly of a solid solution of aluminum titanate and magnesium dititanate and a second crystalline phase comprising cordierite, the article having 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 35% TiO2;
from 5 to 25% SiO2, and a metal oxide sintering aid, wherein the ceramic article comprises a total porosity % P greater than 40% by volume and a coefficient of thermal expansion, as measured between 25-1000°
C., of less than or equal to 15×
10−
7/°
C. - View Dependent Claims (2, 3, 4, 5, 6)
- from 40 to 55% Al2O3;
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7. A ceramic article comprising a first crystalline phase comprised predominantly of a solid solution of aluminum titanate and magnesium dititanate and a second crystalline phase comprising cordierite, the article having 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 35% TiO2;
from 5 to 25% SiO2, and at least one metal oxide sintering aid, wherein the ceramic article comprises a total porosity % P greater than 40% by volume. - View Dependent Claims (8, 9, 10)
- from 40 to 55% Al2O3;
Specification