Alumina, calcia, baria sealing composition optionally modified w

Details Alumina, calcia, baria sealing composition optionally modified w Alumina, calcia, baria sealing composition optionally modified w

1979-04-02

1980-06-17

Vertiz, O. R.

Electric lamp and discharge devices

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

For plural electrodes of discharge device

106 47R, 428432, 428433, 428472, C03C 300, C03C 330, H01J 1718, H01J 6136

Patent

active

042086051

ABSTRACT:
An improved sealing composition for use between alumina ceramic parts, or between alumina ceramic and refractory metal, is based on 47 weight percent Al.sub.2 O.sub.3, 37 weight percent CaO and 16 weight percent BaO. Up to 3 weight percent B.sub.2 O.sub.3 may be added for improved wetting and flow characteristics. The composition has a lower liquidus temperature (1325.degree. C.) than an otherwise similar one previously used which included 5% MgO, and its thermal expansion coefficient is less affected by dissolved Al.sub.2 O.sub.3. As a result, a closer thermal match with alumina ceramic can be maintained during seal processing and the rejection rate is reduced.

REFERENCES:
patent: 3469729 (1969-09-01), Grekils et al.
patent: 3480823 (1969-11-01), Chen
patent: 3588577 (1971-06-01), McVey et al.
patent: 3852079 (1974-12-01), Davis

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