Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1994-06-03
1996-02-06
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428137, 428209, 428332, 428426, 428432, 428433, 361792, 264 56, 264 61, 264 63, 156 89, B32B 400
Patent
active
054894654
ABSTRACT:
A sealed composite ceramic structure is formed by first forming a plurality of composite green sheets. Each of the green sheets is a composite structure comprising a central portion of partially densifiable material and an outer portion of fully densifiable material. Next, top and bottom green sheets of fully densifiable material are formed. The greensheets are then stacked to form a laminated structure in the following order: the bottom green sheet, the plurality of composite green sheets, and the top green sheet. The substrate laminate is sintered to form the sealed structure having a porous central portion. The composite structure has particular application to ceramic substrates for mounting semiconductor devices requiring low dielectric constant substrates, but the structure also has applications in fluid processing using porous laminated structures. In both applications, the creation of a porous ceramic body with solid, sealed edges and/or external surfaces hold significant advantages.
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Frase Katharine G.
Lombardi Thomas E.
Natarajan Govindarajan
Rita Robert A.
Takamori Takeshi
Bahta Abraham
Blecker Ira
International Business Machines - Corporation
Ryan Patrick J.
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