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Gas Panel Retubulation Process

IP.com Disclosure Number: IPCOM000050846D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chaiken, A: AUTHOR [+2]

Abstract

During gas panel fabrication, a small but significant number of gas inlet tubulations are broken from the panels during the normal processing procedures. Since most of the panel fabrication has been completed by the time the inlet tube is sealed to the panel, scrapping panels having broken tubes results in a considerable loss. A process that successfully reclaims panels having broken gas inlet tubulations is, therefore, highly desirable.

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Gas Panel Retubulation Process

During gas panel fabrication, a small but significant number of gas inlet tubulations are broken from the panels during the normal processing procedures. Since most of the panel fabrication has been completed by the time the inlet tube is sealed to the panel, scrapping panels having broken tubes results in a considerable loss. A process that successfully reclaims panels having broken gas inlet tubulations is, therefore, highly desirable.

Referring to the drawing, for panels constructed using composite tubulation seals, i.e., seals composed of a combination of a vitreous glass phase and a crystalline expansion modifier, tubulation 11 having a flared end can be placed over the original seal after remnants of the original tubulation 13 are removed, and then sealed to the panel by reheating the parts to the initial seal temperature. At this temperature, the original sealant 15 will again soften and flow and adhere to the flared tubulation 11. Upon cooling, a rigidly-bonded assembly will result.

However, since the composite seal material typically utilized has a contraction coefficient from its set point temperature which is greater than that of the tubulation glass or that of the float glass substrate, unacceptable radial cracks can sometimes develop in the reprocessed seal material due to the tangential tensile stress that results from the expansion mismatch. Also, since the magnitude of the tensile stress is dependent upon the geometr...