| US 7,470,640 B2 | ||
| Glass-ceramic seals for use in solid oxide fuel cells | ||
| Michael Edward Badding, Campbell, N.Y. (US); Sasha Marjanovic, Painted Post, N.Y. (US); Linda Ruth Pinckney, Corning, N.Y. (US); and Dell Joseph St Julien, Watkins Glen, N.Y. (US) | ||
| Assigned to Corning Incorporated, Corning, N.Y. (US) | ||
| Filed on Oct. 11, 2006, as Appl. No. 11/546,237. | ||
| Application 11/546237 is a continuation in part of application No. 11/402761, filed on Apr. 11, 2006, granted, now 7,378,361. | ||
| Prior Publication US 2008/0090715 A1, Apr. 17, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C03C 10/04 (2006.01); C03C 8/24 (2006.01) | ||
| U.S. Cl. 501—5 [501/8; 501/9; 501/15; 501/21; 501/26] | 15 Claims |
| 1. A glass-ceramic seal composition, said seal composition comprising a glass-ceramic having a glass component and a crystalline
component,
wherein:
said glass-ceramic comprises 30-50 wt. % SiO2, 2-8 wt. % Al2O3, 10-40 wt. % CaO, and at least one of 0-40 wt. % SrO, 0-35 wt. % BaO, 0-10 wt. % MgO;
said glass-ceramic is boron free;
the crystalline component of said glass-ceramic is >50% and the glass component is <50% of the glass-ceramic seal;
referring only to the crystalline component, >50 wt. % of the crystalline component comprises a primary crystalline phase
in which the crystals of the crystalline phase have a structure selected from the structures represented by the group consisting
of walstromite, cyclowollastonite, and μ-(Ca,Sr)SiO3), kalsilite, kaliophilite and wollastonite, and
the remaining <50% of the crystalline component comprises at least one secondary crystalline phase;
the primary crystalline phase is >50% of the crystalline component; and
the glass ceramic has a CTE in the range 70-130×10−7/° C.
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