Patent ID: 7470640
Filing Date: 2008-12-30
Classification: C03C,H01M,Y02E

Abstract:
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. % SiO 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)SiO 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