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AssigneeMurata Manufacturing Co., Ltd.
InventorsHarufumi Mandai, Norio Sakai, Isao Kato, Atsushi Kumano
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There is disclosed a method of producing a ceramic multilayer substrate by laminating a plurality of glass-ceramic green sheets made of a glass-ceramic containing an organic binder and a plasticizer to form a laminate; and firing the laminate; further comprising: applying to or overlaying on the surfaces of the glass-ceramic green sheets inorganic compositions, the sintering temperature of the inorganic compositions being higher than that of the glass-ceramic green sheets; laminating a plurality of the glass-ceramic green sheets having the inorganic compositions applied to or overlaid on the surfaces of the glass-ceramic green sheets respectively, to form a part of the laminate; and laminating a plurality of the glass-ceramic green sheets to form the other part of the laminate.
A ceramic multilayer substrate comprising a laminate comprising
5 A ceramic multilayer substrate according to claim 1, wherein two ceramic green sheets having a smaller thickness than each of the other ceramic green sheets are positioned so as to be the two outermost layers of the laminate.
6 A ceramic multilayer substrate according to claim 1, wherein the inorganic composition comprises alumina.
7 A ceramic multilayer substrate comprising:
A ceramic multilayer substrate according to claim 7, wherein one of the ceramic green sheets has a smaller thickness than each of the other ceramic green sheets and has said inorganic composition layer thereon and said one sheet is positioned so as to be an outermost layer of the laminate.
A ceramic multilayer substrate according to claim 7, wherein a plurality of ceramic green sheets having said inorganic composition layer thereon are positioned adjacent to one another to form said laminate.
A ceramic multilayer substrate according to claim 7, wherein two ceramic green sheets having a smaller thickness than each of the other ceramic green sheets are positioned so as to be the two outermost layers of the laminate.
A ceramic multilayer substrate according to claim 7, wherein the inorganic composition comprises alumina.
A ceramic multilayer substrate according to claim 7, wherein each inorganic composition layer on a ceramic green sheet has a thickness of from about 1 to 20 μm.
A ceramic multilayer substrate according to claim 7, wherein each individual inorganic composition layer on a ceramic green sheet has a thickness of from 1 to 10 μm.
A ceramic multilayer substrate according to claim 7, wherein the ceramic green sheet and inorganic composition are selected such that the difference between the sintering temperature of the ceramic green sheets and the sintering temperature of the inorganic composition is at least about 100° C.
A ceramic multilayer substrate according to claim 7, wherein each of the ceramic green sheets comprise ceramic, organic binder and plasticizer.
Dependencies are inferred from the claim text.