CORDIERITE ALUMINUM MAGNESIUM TITANATE COMPOSITIONS AND CERAMIC ARTICLES COMPRISING SAME
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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
30 Claims
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1-20. -20. (canceled)
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21. 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 (22, 23, 24, 25, 26)
- from 40 to 55% Al2O3;
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27. 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 (28, 29, 30)
- from 40 to 55% Al2O3;
Specification