Patent ID: 6949156

Claim:
In a method for producing a monolithic structure for a multilayer electronic circuit or hydraulic module which method comprises steps of providing green body ceramic tapes each having an x-y plane, applying electronic circuit components to the tapes, stacking the tapes in a z-direction, laminating the stacked tapes, heating the laminate of stacked tapes to remove organic binder from the tapes, and co-firing the binderless laminate to produce the monolithic structure with shrinkage substantially only in the z-direction and substantially no shrinkage in the x-y planes, the improvement comprising: the step of providing the green body ceramic tapes comprises providing at least one tape comprising: (a) a first low temperature ceramic layer comprising particles of a first ceramic, a first glass and a first organic binder; and (b) a self-constraining layer comprising particles of a refractory ceramic, a wetting agent for the first glass, and a second organic binder, wherein the wetting agent comprises at least one selected from the group consisting of a silica, an alkali metal oxide, and a silicate, and the step of co-firing is carried out without application of an external constraint.