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 1165377

23,127 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, having a cavity, at least one closure member, and a seal- ing material. The closure member is formed from a molyb- denum-titanium alloy containing a small amount of nickel, cobalt, or copper. The nickel, cobalt, or copper forms a relatively low melting eutectic with titanium, thereby facilitating fabrication of closure members by sintering. 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.

390435

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