Arc tube for a discharge lamp

Details Arc tube for a discharge lamp Arc tube for a discharge lamp

1989-07-12

1992-03-24

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313636, 501 69, H01J 6136, H01J 926

Patent

active

050991744

ABSTRACT:
A sealing composition is provided for joining crystalline ceramic or cermet parts, e.g. in an arc tube for a discharge lamp. The sealing composition comprises, as starting materials, a mixture of alumina (Al.sub.2,O.sub.3), silica (SiO.sub.2) and magnesia (MgO), the mixture comprising in the ranges of from 22% to 24.5% by weight of Al.sub.2 O.sub.3, from 45.5% to 49.5% by weight of SiO.sub.2, and from 26.0% to 32.5% by weight of MgO. The sealing composition contains less than 40% by weight, of the mixture, of the crystalline phase .alpha.-Cordierite when subjected to the following test procedure.

REFERENCES:
patent: 3940255 (1976-02-01), Harrington et al.
patent: 4694219 (1987-09-01), Hing
Navy Technical Disclosure Bulletin, vol. 5, No. 5, May 1980, pp. 33-38, Navy Case No. 64135, by Kretschmer et al.

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