Browse Prior Art Database

Plasticizing of a Multilayer Ceramic Module

IP.com Disclosure Number: IPCOM000077653D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Anderson, LC: AUTHOR

Abstract

In most multilayer ceramic modules it is necessary to provide a low-modulus green-sheet material for forming a multilayer ceramic package. The low-modulus material is necessary in order to insure that the green-sheet material conforms to internal metallurgy, otherwise voids occur. However, the use of low-modulus green-sheet material creates a problem, in that it tends to cause lateral flow or distortion of the internal metallurgy during the application of laminating pressure.

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Plasticizing of a Multilayer Ceramic Module

In most multilayer ceramic modules it is necessary to provide a low-modulus green-sheet material for forming a multilayer ceramic package. The low-modulus material is necessary in order to insure that the green-sheet material conforms to internal metallurgy, otherwise voids occur. However, the use of low-modulus green-sheet material creates a problem, in that it tends to cause lateral flow or distortion of the internal metallurgy during the application of laminating pressure.

The illustrated package avoids the lateral distortion problem while maintaining the conformability characteristic, by using alternating plasticized green sheet layers 10 and 12 in combination with stiffer plasticized alternating layers 14 and 16. The plasticized layers reduce the modulus coefficient to a very low level, typically 10,000 psi and thus provide the desired conformability characteristics. However, lateral distortion around the internal metallurgy, generally depicted at 18 is reduced or eliminated by the unplasticized high- modulus layers 14 and 16.

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