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Mixed Metallurgy for Multilayer Ceramic Dimensional Control

IP.com Disclosure Number: IPCOM000050866D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Finch, WF: AUTHOR

Abstract

The IBM Technical Disclosure Bulletin 13, 962-963 (September 1970) describes a method for fabricating MLCs (multilayer ceramics). Many factors in this method have an influence on the final dimensions of the completed MLC module. In practice, one designs a new module but its final dimensions (X, Y, via bulge, camber, etc.) are not known until a trial fabrication run is completed. If the dimensions are not correct, the module must be redesigned or a fabrication parameter must be changed Lamination pressure provides a limited control over X, Y dimensions, but not over via bulge or camber.

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Mixed Metallurgy for Multilayer Ceramic Dimensional Control

The IBM Technical Disclosure Bulletin 13, 962-963 (September 1970) describes a method for fabricating MLCs (multilayer ceramics). Many factors in this method have an influence on the final dimensions of the completed MLC module. In practice, one designs a new module but its final dimensions (X, Y, via bulge, camber, etc.) are not known until a trial fabrication run is completed. If the dimensions are not correct, the module must be redesigned or a fabrication parameter must be changed Lamination pressure provides a limited control over X, Y dimensions, but not over via bulge or camber.

The following technique controls X, Y dimensions, via bulge and camber of module designs independently from normal manufacturing controls. This allows for new designs to be introduced into existing manufacturing conditions without upsetting current production. It also allows for current production dimensional problems (due to process drift or changes in raw materials, for example) to be corrected without changing the overall process.

The composition of the metal paste (for lands, ground planes, vias) has an influence on the shrinkage of the module during sintering. The composition of the metal paste typically used is molybdenum powder plus organic vehicle (plus frit in some cases). This new technique uses a similar paste except that the molybdenum powder is replaced with a mixture of molybdenum and tungsten. Shrinkage is l...