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Browse Prior Art Database

Obtaining Bubble Free Seals in Glass Structures

IP.com Disclosure Number: IPCOM000082557D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Berkenblit, M: AUTHOR [+4]

Abstract

Copper containing solder glasses are subject to two distinct phenomena which are detrimental to the seals made in structures such as gas panels. First, there is a tendency for crystallization of Cu(2)O and/or Cu to occur in the seal during panel fabrication. Another problem encountered with such solder glasses is the formation of bubble trains through the center of the seal glass region.

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Obtaining Bubble Free Seals in Glass Structures

Copper containing solder glasses are subject to two distinct phenomena which are detrimental to the seals made in structures such as gas panels. First, there is a tendency for crystallization of Cu(2)O and/or Cu to occur in the seal during panel fabrication. Another problem encountered with such solder glasses is the formation of bubble trains through the center of the seal glass region.

A variety of cleaning and etching experiments (both acid and base solutions) were tried to remove a suspected surface contamination without any success. Cleaning (using acetone, trichloroethylene, or water) with and without prior etching of the solder glass cane had an adverse effect. It was found that such treatments led to a more pronounced bubble train in the seal region.

Experiments have indicated that water outgasses from the cane glass, which is trapped between the solder glass and the glass plates being sealed together. By keeping the solder glass at a high enough temperature to permit outgassing, but at a low enough temperature to prevent appreciable flow of the solder glass and interaction with the plate glass, it is possible to obtain seals with a markedly reduced bubble train formation.

Assembly of the panel is unchanged, the solder glass cane is first formed into a frame the size of the seal region and sandwiched between the two pieces of plate glass that are to be joined. The sealing cycle is modified to accommodate the...