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AssigneeChloride Silent Power Limited
InventorsThomas I. Barry, Gary S. Schajer, Francis M. Stackpool
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A glass for sealing a beta-alumina tube in a sodium-sulphur cell has a composition suitable to resist attack by sodium at elevated temperatures and a coefficient of thermal expansion suitable for use with beta-alumina. The glass consists essentially of 28-48 mol % B.sub.2 O.sub.3, 0-20 mol % SiO.sub.2, 16-28 mol % Al.sub.2 O.sub.3, together with 18-33 mol % of at least one alkaline earth oxide selected from the group consisting of BaO, SrO, CaO and MgO, the proportions of the constituents being such that the combined total of B.sub.2 O.sub.3 and SiO.sub.2 is 40 to 60 mol % and furthermore being such that 0.0517 A.sub.1 +0.0354 A.sub.2 -0.0063 A.sub.3 +0.168 A.sub.4 +0.1336 A.sub.5 +0.098 A.sub.6 +0.1597 A.sub.7, lies between 5.7 and 6.4 where A.sub.1, A.sub.2, A.sub.3, A.sub.4, A.sub.5, A.sub.6 and A.sub.7 are the respective molar percentages of B.sub.2 O.sub.3, SiO.sub.2, Al.sub.2 O.sub.3, BaO, CaO, MgO and SrO. A cell sealed with such a glass is described.
A glass for sealing to beta-alumina in an electro-chemical cell or other energy conversion device containing sodium, said glass consisting essentially of:
A hermetic seal between an alpha-alumina component and a beta-alumina component in a sodium sulphur cell comprising a glass body fused between surfaces of these components, the glass consisting essentially of 28-48 mol % B.sub.2 O.sub.3, 0-20 mol % SiO.sub.2, 16-28 mol % Al.sub.2 O.sub.3, together with 18-33 mol % of at least one alkaline earth oxide selected from the group consisting of BaO, SrO, CaO and MgO, the proportions of the constituents being such that the combined total of B.sub.2 O.sub.3 and SiO.sub.2 is 40 to 60 mol % and furthermore being such that 0.0517 A.sub.1 +0.0354 A.sub.2 -0.0063 A.sub.3 +0.168 A.sub.4 +0.1336 A.sub.5 +0.098 A.sub.6 +0.1597 A.sub.7, lies between 5.7 and 6.4 where A.sub.1, A.sub.2, A.sub.3, A.sub.4, A.sub.5, A.sub.6 and A.sub.7 are the respective molar percentages of B.sub.2 O.sub.3, SiO.sub.2, Al.sub.2 O.sub.3, BaO, CaO, MgO and SrO.
In a sodium-sulphur cell having a housing containing a beta-alumina tube forming a separator between a cathodic region containing a cathodic reactant comprising sulphur and sodium polysulphides and an anodic region comprising sodium;
A glass for sealing beta-alumina in an electro-chemical cell or other energy conversion device, said glass comprising, in mol percentage, about 42.82% B.sub.2 O.sub.3, 15.26% SiO.sub.2, 22.48% Al.sub.2 O.sub.3 and 19.44% BaO.
A glass for sealing beta-alumina in an electro-chemical cell or other energy conversion device, said glass comprising, in mol percentage, about 44.9% B.sub.2 O.sub.3, 10.0% SiO.sub.2, 17.0% Al.sub.2 O.sub.3, 4.22% BaO, 5.61% CaO, 14.05% MgO and 4.22% SrO.
A glass for sealing beta-alumina in an electro-chemical cell or other energy conversion device, said glass comprising, in mol percentage, about 32.0% B.sub.2 O.sub.3, 20.0% SiO.sub.2, 19.7% Al.sub.2 O.sub.3 and 28.3% CaO.
An electro-chemical cell containing sodium and having a beta-alumina element sealed to another element by glass fused between the elements, said glass comprising, in mol percentage, about 42.82% B.sub.2 O.sub.3, 15.26% SiO.sub.2, 22.48% Al.sub.2 O.sub.3 and 19.44% BaO.
An electro-chemical cell containing sodium and having a beta-alumina element sealed to another element by glass fused between the elements, said glass comprising, in mol percentage, about 44.9% B.sub.2 O.sub.3, 10.0% SiO.sub.2, 17.0% Al.sub.2 O.sub.3, 4.22% BaO, 5.61% CaO, 14.05% MgO and 4.22% SrO.
An electro-chemical cell containing sodium and having a beta-alumina element sealed to another element by glass fused between the elements, said glass comprising, in mol percentage, about 32.0% B.sub.2 O.sub.3, 20.0% SiO.sub.2, 19.7% Al.sub.2 O.sub.3 and 28.3% CaO.
Dependencies are inferred from the claim text.