Seal for vacuum devices and methods for making same

Details Seal for vacuum devices and methods for making same Seal for vacuum devices and methods for making same

1997-06-30

1999-04-27

Silverman, Stanley S.

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

65 34, 65 591, 65 5921, 220 22, 228 31, 228 60, 228115, E06B 324

Patent

active

058979271

ABSTRACT:
A method for permanently sealing an ultra-high vacuum within a glass enclosure. This is accomplished by first forming a hole, either in one of the flat plates that form the enclosure or in one of the standoffs that separate the plates, and then sealing a metal tube to the glass. In one embodiment, the metal tube is positioned so as to be partly inside the hole while in another a flange at the end of the tube is positioned to cover the hole. In both cases, a glass frit paste is then applied all around the glass metal interface. This is followed by heating so that the frit softens and becomes a glass-to-metal seal. Once the structure has cooled down the attached metal tube is used as a pumping port to evacuate it and, while still under vacuum, the metal tube is pinched off to form a permanent seal.

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