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Electrically Conductive Ceramic Green Sheets

IP.com Disclosure Number: IPCOM000082615D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hait, GF: AUTHOR [+2]

Abstract

A conductive layer is useful on ceramic green sheets for E-beam cutting for the electrostatic pickup during transfer into the E-beam chamber, for dissipation of electric charges during E-beam cutting and to prevent or reduce electrostatic pickup of dust particles during handling.

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Electrically Conductive Ceramic Green Sheets

A conductive layer is useful on ceramic green sheets for E-beam cutting for the electrostatic pickup during transfer into the E-beam chamber, for dissipation of electric charges during E-beam cutting and to prevent or reduce electrostatic pickup of dust particles during handling.

The conductive layer turns completely into volatile compounds during firing of the ceramic, and it does not interfere with the laminating of stacks of ceramic green sheets to each other.

The preferred layer is a very thin colloidal graphite film which meets the above requirements. Colloidal graphite, in a mixture of water and a low aliphatic alcohol are applied to the surface as a very thin layer by wiping, rolling, dip coating, etc., and dried. If, for example, a mixture of 2.5 grams colloidal graphite in 70 grams of water and 30 grams of methylalcohol is used, a surface conductivity of 40 kohms per square is obtained.

The use of the alcohol in the mixture is critical, since it is a solvent for the binder or the coat on the green sheet (polyvinylbutyral, methacrylate or polyamide). It makes it possible to form a continuous layer of particles without de-wetting or formation of droplets.

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