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Casting of Glass Powder Paste Seal Rods

IP.com Disclosure Number: IPCOM000085017D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Foster, BJ: AUTHOR [+3]

Abstract

For certain applications it is desirable to cast metal, ceramic, or glass powders into thin, narrow, and long strips after mixing such powders with suitable organic vehicles and binders to make a paste. The cast strips are dried and heated to expel the organic material and sinter the powder particles to impart adequate strength and rigidity. One such application involves the forming of presintered seal rods of divitrified seal glass powder for gas panel sealing.

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Casting of Glass Powder Paste Seal Rods

For certain applications it is desirable to cast metal, ceramic, or glass powders into thin, narrow, and long strips after mixing such powders with suitable organic vehicles and binders to make a paste. The cast strips are dried and heated to expel the organic material and sinter the powder particles to impart adequate strength and rigidity. One such application involves the forming of presintered seal rods of divitrified seal glass powder for gas panel sealing.

A modified doctor blade is employed to fabricate thin sheets on a plastic film. The doctor blade, instead of being a continuous straight edged blade, has a number of cutout sections of desired geometry which serve as gates for the paste to flow through as the plastic sheet is pulled from under the blade. The uncut parts of the blade edge are adapted to rest on the surface of the plastic sheet to block paste flow in between the cutout sections.

The method enables simultaneous casting of as many strips of the glass sealing paste as there are cutout sections in the doctor blade. The width, height and cross-sectional contours of the strips are varied, by varying the dimensions in the geometric shape of the cutout portions and the rheology of the paste being cast.

The strips can be either cut to the desired lengths prior to firing or can be cast into desired lengths by periodic blocking of the cutouts with a shutter blade. In order to avoid jagged edges, caused by the pl...