Bodies composed of at least two parts, sealing glass and method

Details Bodies composed of at least two parts, sealing glass and method Bodies composed of at least two parts, sealing glass and method

1980-11-24

1982-05-18

Bell, Mark

Stock material or miscellaneous articles

Composite

Of quartz or glass

501 49, 501 52, 501 79, 428432, B32B 1706, C03C 314

Patent

active

043305962

ABSTRACT:
In practice no sealing glasses are known with which glass or ceramic material having a coefficient of thermal expansion .alpha..sub.30.degree.-300.degree. C. in the range between 31 to 36.times.10.sup.-7 per .degree.C. can be sealed together.
The invention provides bodies which are composed of at least two parts, these parts having been made from a material having a coefficient of expansion as mentioned above, the parts having been sealed together by means of a sealing glass containing 8-10 weight % vanadium pentoxide, 1.5-3.0 weight % copper (II) oxide, 1-3 weight % lead (II) oxide, 0-1 weight % silicon oxide, 0-5 weight % aluminium oxide, 26-28 weight % boron oxide and 58-61 weight % zinc oxide. The weight ratio of boron oxide to zinc oxide is in the range from 0.45 to 0.47.
The body is composed of parts (1 and 3), which have been sealed together by means of the sealing glass (2).

REFERENCES:
patent: 3446695 (1969-05-01), Janakirama-Rao et al.
patent: 3970464 (1976-07-01), Shill

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