Vacuum-tight assembly particularly for a discharge tube

Details Vacuum-tight assembly particularly for a discharge tube Vacuum-tight assembly particularly for a discharge tube

1980-11-21

1982-12-28

Smith, Alfred E.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

220 21R, 313220, 403 28, H01J 6130, F16D 100, H05K 1516, H01B 1706

Patent

active

043664105

ABSTRACT:
A vacuum-tight assembly, such as a discharge tube for a sodium vapor arc lamp, includes a high density polycrystalline ceramic body, such as alumina or yttria, having a cavity and at least one closure member and a sealing material for sealing the cavity from the atmosphere. The closure member is formed from a molybdenum alloy containing titanium, vanadium, chromium or mixtures thereof. 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.

REFERENCES:
patent: 3061664 (1962-10-01), Kegg
patent: 3275358 (1966-09-01), Shonebarger
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patent: 3588577 (1971-06-01), McVey
patent: 3761744 (1973-02-01), Delombre
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patent: 4160186 (1979-07-01), Kerekes
patent: 4197957 (1980-04-01), Buhrer
patent: 4291250 (1981-09-01), Bhalla
Hansen, Constitution of Binary Alloys, McGraw-Hill, N.Y., 1958, pp. 537-539, 976-978 & 980.
Thermophysical Properties of Matter, IFI-Plenum, N.Y. 1975, vol. 12, pp. 923-925 & 713-718.

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