US5102720A — Co-fired multilayer ceramic tapes that exhibit co…

Claim 1

Independent Claim 121 words

A multilayer green substrate assembly for sintering to provide a multilayer circuit, said multilayer green substrate comprising: (a) at least one layer predominantly containing glass particles held together by an organic binder; (b) at least one layer predominantly containing ceramic particles held together by an organic binder, said ceramic particles being composed of ceramic material which is wetted by the glass without significant dissolution or sintering, being such as to remain rigid at sintering temperatures and being such as to stabilize the substrate against shrinkage in the x-y plane on sintering and to substantially constrain shrinkage on sintering to the z-direction; (c) at least one layer of (a) or (b) or (a) and (b) being printed with a metal conductive pattern.

Claim 2

Dependent Claim 121 words

A multilayer green substrate assembly for sintering to provide a multilayer circuit, said multilayer green substrate comprising: (a) at least one layer predominantly containing glass particles held together by an organic binder; (b) at least one layer predominantly containing ceramic particles held together by an organic binder, said ceramic particles being composed of ceramic material which is wetted by the glass without significant dissolution or sintering, being such as to remain rigid at sintering temperatures and being such as to stabilize the substrate against shrinkage in the x-y plane on sintering and to substantially constrain shrinkage on sintering to the z-direction; (c) at least one layer of (a) or (b) or (a) and (b) being printed with a metal conductive pattern.

Claim 3

Dependent Claim 40 words

The substrate of claim 1 wherein each layer (a) contains on a glass plus ceramic basis at least 60% by volume glass and wherein each layer (b) contains on a glass plus ceramic basis at least 60% by volume ceramic.

Claim 4

Dependent Claim 19 words

The substrate of claim 2 wherein said glass has a sintering temperature ranging from 600° C. to 1500° C.

Claim 5

Dependent Claim 19 words

The substrate of claim 3 wherein said glass has a sintering temperature ranging from 800° C. to 900° C.

Claim 6

Dependent Claim 20 words

The substrate of claim 2 wherein said ceramic is selected from the group consisting of carbides, nitrides, oxides and borides.

Claim 7

Dependent Claim 11 words

The substrate of claim 5 wherein said ceramic is aluminum nitride.

Claim 8

Dependent Claim 14 words

The substrate of claim 4 wherein said ceramic is diamond or poorly crystallized carbon.

Claim 9

Dependent Claim 31 words

The substrate of claim 2 wherein each layer (b) contains on a glass plus ceramic basis from 10% to 30% by volume glass and from 90% to 70% by volume ceramic.

Claim 10

Dependent Claim 92 words

A multilayer substrate for mounting of electronic or opto-electronic components, said substrate comprising (a) at least one layer which has a glass matrix and has a porosity from 0 to 10% by volume and contains from 0 to 60% by volume ceramic; (b) at least one layer which contains at least 60% by volume ceramic particles with the remainder being any combination of porosity and glass; the ceramic of (a) and the ceramic particles of (b) being composed of ceramic material which is wetted by the glass without significant dissolution or sintering.

Claim 11

Dependent Claim 92 words

A multilayer substrate for mounting of electronic or opto-electronic components, said substrate comprising (a) at least one layer which has a glass matrix and has a porosity from 0 to 10% by volume and contains from 0 to 60% by volume ceramic; (b) at least one layer which contains at least 60% by volume ceramic particles with the remainder being any combination of porosity and glass; the ceramic of (a) and the ceramic particles of (b) being composed of ceramic material which is wetted by the glass without significant dissolution or sintering.

Claim 12

Dependent Claim 8 words

The substrate of claim 9 which is self-supporting.

Claim 13

Dependent Claim 22 words

The substrate of claim 9 which is built on a monolithic ceramic substrate of ceramic selected from carbides, nitrides, oxides and borides.

Claim 14

Dependent Claim 24 words

The substrate of claim 9 wherein at least one of (a) or (b) or (a) and (b) is printed with a metal conductive pattern.

Claim 15

Dependent Claim 30 words

The substrate of claim 9 wherein the layer (a) has a low dielectric constant and the layer (b) has either a low or high dielectric constant or is a resistor.

Claim 16

Dependent Claim 12 words

The substrate of claim 13 wherein the layer (b) has electro-optic properties.

Claim 17

Dependent Claim 102 words

A multilayer green substrate assembly for fabrication of multilayer packages with metal circuits, said multilayer green substrate comprising: (a) at least one layer predominantly containing glass particles held together by an organic binder; (b) at least one layer predominantly containing ceramic particles held together by an organic binder, said ceramic particles being composed of ceramic material which is wetted by the glass without significant dissolution or sintering, being such as to remain rigid at sintering temperatures and being such as to stabilize the substrate against shrinkage in the x-y plane on sintering and to substantially constrain shrinkage on sintering to the z-direction.

Claim 18

Dependent Claim 102 words

A multilayer green substrate assembly for fabrication of multilayer packages with metal circuits, said multilayer green substrate comprising: (a) at least one layer predominantly containing glass particles held together by an organic binder; (b) at least one layer predominantly containing ceramic particles held together by an organic binder, said ceramic particles being composed of ceramic material which is wetted by the glass without significant dissolution or sintering, being such as to remain rigid at sintering temperatures and being such as to stabilize the substrate against shrinkage in the x-y plane on sintering and to substantially constrain shrinkage on sintering to the z-direction.

Claim 19

Dependent Claim 52 words

The assembly of claim 15 which consists of a three layer structure where the outer layers are layers (a) which contain on a glass plus ceramic basis at least 60% by volume glass and a middle layer (b) which contains on a glass plus ceramic basis at least 60% by volume ceramic.

Claim 20

Dependent Claim 84 words

In the method for producing a self standing substrate for a multilayer circuit which method comprises the steps of tape casting, screen printing, stacking, laminating, and removing organic binder to provide a green multilayer assembly comprising glass and ceramic which is composed of material which is wetted by the glass without significant dissolution or sintering, and co-firing, the improvements comprising co-firing under a pressure applied in the z-direction and with shrinkage essentially only in the z-direction and essentially no shrinkage in the x-y plane.

Claim 21

Dependent Claim 84 words

In the method for producing a self standing substrate for a multilayer circuit which method comprises the steps of tape casting, screen printing, stacking, laminating, and removing organic binder to provide a green multilayer assembly comprising glass and ceramic which is composed of material which is wetted by the glass without significant dissolution or sintering, and co-firing, the improvements comprising co-firing under a pressure applied in the z-direction and with shrinkage essentially only in the z-direction and essentially no shrinkage in the x-y plane.

Claim 22

Dependent Claim 44 words

The method of claim 17 wherein the co-firing is carried out with the green multi-layer assembly built on a monolithic ceramic substrate thereby to provide greater reliability by the elimination of delamination and interface defects that otherwise result from shrinkage in the x-y plane.

Claim 23

Dependent Claim 39 words

The method of claim 18 wherein co-firing is carried out under a pressure applied in the z-direction in the range of 3 to 30 psi thereby to prevent warping and improve adhesion between layers and said monolithic ceramic substrate.

Claim 24

Dependent Claim 38 words

The method of claim 17 where co-firing is carried out under a pressure applied in the z-direction in the range of 3 to 30 psi thereby to improve adhesion between layers and to reduce the possibility of warping.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-04-07	1995-10-07	1996-04-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-04-07	1999-10-07	2000-04-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-04-07	2003-10-07	2004-04-07	$7700.00	Window Closed / Lapsed

Co-fired multilayer ceramic tapes that exhibit constrained sintering

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