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Pin Hole Free Glassing

IP.com Disclosure Number: IPCOM000096331D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Hymes, IM: AUTHOR

Abstract

This method of coating application prevents pin holes developing in the coating due to outgassing of the coated member.

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Pin Hole Free Glassing

This method of coating application prevents pin holes developing in the coating due to outgassing of the coated member.

A pressure chamber 20 having a stand 22 which includes a heating element 24 is adapted to support a container 26 of coated specimens 28, the coating being typically glass or like. The glass frit can be applied by various methods such as spraying, sedimentation, etc. This apparatus provides pressurized firing of the glaze. A gas vent 30 is included in the apparatus to introduce a predetermined vapor pressure. The magnitude of the pressure is selected to counterbalance any outgassing from the specimen 28. When the outgassing pressure is balanced by the atmosphere in the pressure apparatus, the pin holes in the coating are eliminated thus providing a specimen which is hermetically sealed.

The pressure provided must also be an atmosphere innocuous to the coating process. In one form, the enameling of a KOVAR* specimen requires an atmosphere of nitrogen or helium that has a pressure which is equal to the products of combustion of the small percentage of carbon in the KOVAR. Alternatively, the pressure selected should be arranged to balance the hydrogen in the KOVAR as the result of hydrogen annealing of the material. *KOVAR is a trademark of Westinghouse Electric Corp.

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