Browse Prior Art Database

Preliminary Seal of Gas Panel Tubulation

IP.com Disclosure Number: IPCOM000089751D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Braen, RC: AUTHOR

Abstract

The process described below prevents entry of moisture and other contaminants into a gas panel between the sealing and backfilling operations in the fabrication process. In gas panel operation, the operating voltage of the panel is a function of the secondary emission yield of the top surface of the dielectric layer, and refractory materials having high coefficients of secondary emission, such as magnesium oxide over the dielectric, are used to enhance the secondary emission yield, thereby lowering the operating voltage.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 66% of the total text.

Page 1 of 1

Preliminary Seal of Gas Panel Tubulation

The process described below prevents entry of moisture and other contaminants into a gas panel between the sealing and backfilling operations in the fabrication process. In gas panel operation, the operating voltage of the panel is a function of the secondary emission yield of the top surface of the dielectric layer, and refractory materials having high coefficients of secondary emission, such as magnesium oxide over the dielectric, are used to enhance the secondary emission yield, thereby lowering the operating voltage.

The magnesium oxide refractory layer may be formed over the dielectric by any conventional means, such as electron (E)-beam evaporation, etc. However, current production of gas panels utilizes an open-ended exhaust tube for evacuation and backfilling, thus permitting the glow discharge chamber to breathe during cool-down after the sealing cycle. It is postulated that this affects the magnesium oxide surface characteristics by permitting entry of moisture or other contaminants between the sealing and backfilling operations.

The simplest solution to this problem would be to use a closed-end tube at the tubulation instead of an open tube, and the tube could be wire-cut for evacuation and backfilling, and then resealed or tipped. However, this method may not be satisfactory, since relief of the heated atmosphere during the sealing cycle may affect the seal hermaticity. To eliminate this potential problem affec...