Composite body useful in gas discharge lamp

Compositions – Electrically conductive or emissive compositions – Free metal containing

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252512, 252514, 252515, 252521, 313220, 313221, 106 52, 106 54, 106 732, H01B 102

Patent

active

041220420

ABSTRACT:
A composite body consisting of two or more formed parts of densely sintered aluminum oxide and a metal such as an envelope for a mercury vapor discharge lamp with a metal halide filling. The parts are connected together with material which comprises at least two of the oxides SiO.sub.2, Al.sub.2 O.sub.3 and B.sub.2 O.sub.3 and at least one of the trivalent oxides La.sub.2 O.sub.3 and Y.sub.2 O.sub.3. This material is applied at a relatively low temperature and is resistant to the gas filling up to approximately 1350.degree. C.

REFERENCES:
patent: 3173779 (1965-03-01), Navias
patent: 3563773 (1971-02-01), Bromer et al.
patent: 3588573 (1971-06-01), Chen et al.
patent: 3609437 (1971-09-01), Tol et al.
patent: 4001625 (1977-01-01), Schat et al.

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