Very low expansion sealing frits

Details Very low expansion sealing frits Very low expansion sealing frits

1980-12-19

1982-02-16

Hearn, Brian E.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 4, 501 69, 65 43, C03C 100, C03C 322

Patent

active

043159915

ABSTRACT:
This invention is drawn to thermally devitrifiable sealing glasses capable of forming sound seals with glasses, glass-ceramics, and ceramics having coefficients of thermal expansion (0.degree.-300.degree. C.) between about 0.5-5.times.10.sup.-7 /.degree. C. In finely fritted form, the glasses can be sintered and crystallized in situ at about 900.degree.-1000.degree. C. The glasses consist essentially, expressed in weight percent on the oxide basis, of about 1-2% Li.sub.2 O, 0.7-1.5% MgO, 9-13% ZnO, 19-23% Al.sub.2 O.sub.3, 62-68% SiO.sub.2, and at least 1% K.sub.2 O+Rb.sub.2 O+Cs.sub.2 O in the indicated proportions of 0-3% K.sub.2 O, 0-4% Rb.sub.2 O, and 0-6% Cs.sub.2 O.

REFERENCES:
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patent: 3220815 (1965-11-01), McMillan
patent: 3499787 (1970-03-01), Inoue
patent: 3634111 (1972-01-01), Foster
patent: 3812689 (1974-05-01), Reade
patent: 3856497 (1974-12-01), Hummel
patent: 3907577 (1975-09-01), Kiefer
patent: 3929494 (1975-12-01), Veres
patent: 3978315 (1976-08-01), Martin
patent: 4111708 (1978-09-01), Flannery
Petzold, "Metastabile Mischkrimstalle mit Quarzstruktur mit Oxidsystem Li.sub.2 O--MgO-ZnO--Al.sub.2 O.sub.3 --SiO.sub.2 ", Glasstechn. Ber., vol. 40, No. 10 (1967) pp. 385-395.

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