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US 6,319,343 B1Granted
Green sheets of controlled microporosity and method of producing same
AssigneeInternational Business Machines Corporation
InventorsCynthia N. Felisberto, Stephen A. Milkovich, Robert Wolff Nufer
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Abstract
Ceramic green sheets of controlled microporosity and method of making same have been provided. Controlled microporosity is achieved by including certain ionic species in the ceramic composition, particularly boron, phosphorus and copper oxide.
Claims14
A method of producing a ceramic sheet, comprising the steps of:
- preparing a ceramic green sheet slurry containing polyvinylbutyral, ceramic particulate consisting essentially of alumina and being devoid of boron species and phosphorus species, and a solvent system;
- adding ionic species to said ceramic green sheet slurry, wherein said ionic species are selected from the group consisting of boron compounds in their ionic form, and phosphorus compounds in their ionic form;
- casting said ceramic green sheet slurry;
- allowing said ceramic green sheet slurry to set to provide a green sheet having controlled microporosity, wherein a time for setting of said ceramic green sheet slurry with said ionic species is faster than for said ceramic green sheet slurry when devoid of said ionic species;
- and
- sintering said ceramic green sheet slurry to produce a ceramic sheet.
3 more elements
A method of producing a multilayered ceramic structure from ceramic green sheets of controlled microporosity and compressibility, comprising the steps of:
- preparing a ceramic green sheet slurry containing polyvinylbutyral, ceramic particulate consisting essentially of alumina and being devoid of boron species and phosphorus species, and a solvent system;
- adding ionic species to said ceramic green sheet slurry, wherein said ionic species are selected from the group consisting of boron compounds in their ionic form, and phosphorus compounds in their ionic form;
- casting said ceramic green sheet slurry;
- allowing said ceramic green sheet slurry to set to provide a green sheet having controlled microporosity, wherein a time for setting of said ceramic green sheet slurry with said ionic species is faster than for said ceramic green sheet slurry when devoid of said ionic species;
- cutting discrete green sheet components from said set green sheet slurry and stacking said discrete green sheet components in registration with each other;
- pressing said discrete green sheet components together with heat and pressure sufficient to bring the surfaces of adjacent discrete green sheets into contact with each other and fusing said polyvinylbutyral to form a laminated, multilayered structure;
- and
- sintering said laminated, multilayered structure to produce a multilayered ceramic structure.
5 more elements
Dependencies are inferred from the claim text.