Vacuum-tight assembly

Details Vacuum-tight assembly Vacuum-tight assembly

H - Electricity

01

J

313/135, 313/170

H01J 61/36 (2006.01) H01J 5/20 (2006.01) H01J 61/30 (2006.01)

Patent

CA 1165378

22, 515 ABSTRACT OF THE DISCLOSURE A vacuum-tight assembly, such as a discharge tube for a sodium vapor arc lamp, includes a high density poly- crystalline ceramic body, such as alumina or yttria, hav- ing a cavity and at least one closure member and a seal- ing material for sealing the cavity from the atmosphere. the closure member is formed from a molybdenum alloy containing titanium, vanadium, chromium or mixtures there- of. The closure member and the sealing material have thermal coefficients of expansion closely matched to the thermal coefficient of expansion of the ceramic body over a wide temperature range. In a preferred embodiment, an alumina discharge tube is sealed by a closure member formed from a molybdenum alloy containing 50 atom percent titanium.

390446

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