High cordierite-to-mullite ratio cordierite-mullite-aluminum magnesium titanate compositions and ceramic articles comprising same
AssigneeCorning Incorporated
InventorsMonika Backhaus-Ricoult, Patrick David Tepesch, Bryan Ray Wheaton
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Abstract
Disclosed are ceramic bodies comprised of composite cordierite-mullite-aluminum magnesium titanate (CMAT) ceramic compositions having high cordierite-to-mullite ratio and methods for the manufacture of same.
Claims21
A ceramic article, comprising:
- a pseudobrookite phase comprising predominately alumina, magnesia, and titania;
- a second phase comprising cordierite;
- and
- a third phase comprising mullite,
- wherein the cordierite-to-mullite phase weight ratio is greater than or equal to 1.3 and less than or equal to 7.
A ceramic article comprising a first crystalline phase comprised predominantly of a solid solution of aluminum titanate and magnesium dititanate, a second crystalline phase comprising cordierite, and a third crystalline phase comprising mullite, 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 44% TiO2;
- from 5 to 25% SiO2, and a sintering aid, wherein the cordierite-to-mullite phase weight ratio is greater than or equal to 1.3 and less than or equal to 7.
A method of manufacturing a ceramic article, comprising:
- providing an inorganic batch composition comprising a magnesia source, a silica source, an alumina source, a titania source, and at least one sintering aid;
- mixing the inorganic batch composition together with one or more processing aid selected from the group consisting of a plasticizer, lubricant, binder, pore former, and solvent, to form a plasticized ceramic precursor batch composition;
- shaping the plasticized ceramic precursor batch composition into a green body;
- and
- firing the green body under conditions effective to convert the green body into a ceramic article comprising a pseudobrookite phase comprising predominately alumina, magnesia, and titania, a second phase comprising cordierite, and a third phase comprising mullite,
- wherein the cordierite-to-mullite phase weight ratio is greater than or equal to 1.3 and less than or equal to 4.
Dependencies are inferred from the claim text.