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Isotropic Ceramic Green Sheet Fabrication Method

IP.com Disclosure Number: IPCOM000078971D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Best, B: AUTHOR

Abstract

The drawing shows a ceramic structure that has been cut to a desired shape for a circuit device, and is ready to be punched for via holes and printed with conductive patterns and thereafter fired. The device is constructed by first doctor blading a layer of ceramic paint on a plastic or metal carrier. The paint consists of ceramic particles, an organic binder that holds the particles together, an organic plasticizer that makes the sheet nonbrittle, and an organic thinner to give the paint an appropriate consistency for spreading. The thinner is then evaporated to form a sheet that can be handled without breaking. The process of doctor blading orients the ceramic structure so that the shrinkage which normally occurs during firing, is greater in one dimension than in the other.

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Isotropic Ceramic Green Sheet Fabrication Method

The drawing shows a ceramic structure that has been cut to a desired shape for a circuit device, and is ready to be punched for via holes and printed with conductive patterns and thereafter fired. The device is constructed by first doctor blading a layer of ceramic paint on a plastic or metal carrier. The paint consists of ceramic particles, an organic binder that holds the particles together, an organic plasticizer that makes the sheet nonbrittle, and an organic thinner to give the paint an appropriate consistency for spreading. The thinner is then evaporated to form a sheet that can be handled without breaking. The process of doctor blading orients the ceramic structure so that the shrinkage which normally occurs during firing, is greater in one dimension than in the other.

Two sheets are then placed with their outermost ceramic surfaces together and with their directions of greatest shrinkage at right angles to each other. The layers are laminated with heat and pressure and are then cut to form the structure of the drawing. The ceramic portion of this structure includes two laminated layers 2, 3 that will shrink evenly on firing, and two plastic outer layers 4 and 5 that can be maintained until the device is ready for the next step of the process.

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