Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Reexamination Certificate
2006-10-11
2008-12-30
Group, Karl E (Department: 1793)
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C501S008000, C501S009000, C501S015000, C501S021000, C501S026000
Reexamination Certificate
active
07470640
ABSTRACT:
The invention is directed to highly crystalline, frit-sintered glass-ceramic materials and seals made using them that are suitable for solid oxide fuel cell applications. The seals have a coefficient of thermal expansion in the range of 70-130×10−7° C., preferably 85-115×10−7° C. The glass-ceramic materials have a crystalline component and a glass component, the crystalline component being>50% of the glass-ceramic and the glass component being<50%. In one preferred embodiment the crystalline component is >75%. Regarding the crystalline component only,>50% of the crystals in the crystalline component of the glass-ceramic has a structure selected from the structural groups represented by walstromite, cyclowollastonite, μ-(Ca,Sr)SiO3, kalsilite, kaliophilite and wollastonite (the primary crystalline phase) and the remaining <50% of the crystalline component is at least one secondary crystalline phase. Generally, the glass-ceramics of the invention are useful as metal-to-metal, metal-to-ceramic and ceramic-to-ceramic sealing agents.
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Badding Michael Edward
Marjanovic Sasha
Pinckney Linda Ruth
St Julien Dell Joseph
Corning Incorporated
Douglas Walter M.
Group Karl E
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