Ceramic discharge vessel having a sealing composition
AssigneeOsram Sylvania Inc.
InventorArlene Hecker
Life of this patent
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Abstract
A sealing composition for ceramic discharge vessels is described. The sealing composition contains about 20 to about 40 mole percent MgO, about 20 to about 45 mole percent Y2O3, and about 20 to about 60 mole percent Al2O3 and has a melting point of less than about 1800° C., and preferably from about 1700° C. to about 1800° C. The sealing composition may be used for making ceramic-to-ceramic or ceramic-to-metal seals in ceramic discharge vessels.
Claims18
A ceramic discharge vessel, comprising:
- a ceramic body, at least one electrode assembly, and at least one seal, the ceramic body enclosing a discharge chamber, the seal containing a sealing composition having a melting point of less than about 1800° C. and consisting of about 20 to about 40 mole percent MgO, about 20 to about 45 mole percent Y2O3, about 20 to about 60 mole percent Al2O3 and less than about 5 weight percent silica.
A sealed ceramic article, comprising a first part comprised of a first ceramic material and a second part comprised of either a second ceramic material or a metal, a sealing composition joining the first and second parts to form the seal, the sealing composition having a melting point of less than about 1800° C. and consisting of about 20 to about 40 mole percent MgO, about 20 to about 45 mole percent Y2O3, about 20 to about 60 mole percent Al2O3 and less than about 5 weight percent silica.
Dependencies are inferred from the claim text.