Alumina, calcia, baria, strontia sealing composition and article

Details Alumina, calcia, baria, strontia sealing composition and article Alumina, calcia, baria, strontia sealing composition and article

1979-03-15

1980-04-22

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

041997042

ABSTRACT:
An improved sealing composition for use between alumina ceramic parts, or between alumina ceramic and refractory metal, is based on 40 wt% Al.sub.2 O.sub.3, 35 wt% CaO, 15 wt% BaO and 10 wt% SrO, and has an average thermal expansion coefficient of 95.times.10.sup.-7 /.degree.C. between 25.degree. C. and 600.degree. C. This composition after sealing achieves a closer match to the coefficient of thermal expansion of high density polycrystalline alumina (86.times.10.sup.-7 /.degree.C.) than previously available materials. In addition, it has a wider sealing range which facilitates seal processing.

REFERENCES:
patent: 3441421 (1969-04-01), Sarver et al.
patent: 3469729 (1969-09-01), Grekila 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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