Vacuum-tight assembly

Details Vacuum-tight assembly Vacuum-tight assembly

1980-11-21

1982-06-15

Dixon, Jr., William R.

Receptacles

Envelope for electric lamp or similar device

Tv tube

174 5061, 174 5063, 174152GM, 403 28, 403179, 428 35, H01J 6130, F16D 100, H05K 1506, H01B 1706

Patent

active

043346286

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, at least one closure member, and a sealing material. The closure member is formed from a molybdenum-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.

REFERENCES:
patent: 3061664 (1962-10-01), Kegg
patent: 3275358 (1966-09-01), Shonebarger
patent: 3435180 (1969-03-01), Kershaw
patent: 4197957 (1980-04-01), Buhrer
Hansen, "Constitution of Binary Alloys", McGraw-Hill, New York, (1958), pp. 976-978.

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