# US 2014/0196935 A1 · Ceramic substrate and process for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196935 A1 - Document ID: US20140196935A1 - Status: Published application - Kind: A1 - Application number: 14/235,529 - Filed: 2013-03-12 - Published: 2014-07-17 - Earliest claimed: 2012-03-14 - Assignees: Ngk Spark Plug Co., Ltd. - Applicants: Ngk Spark Plug Co., Ltd. - Inventors: Takatoshi Tojo; Shinji Suzumura; Yoshitaka Yoshida; Masahiro Ogawa - Web page: https://patentgrep.com/patent/US20140196935A1 ## CPC - H05K 1/0306: {Inorganic insulating substrates, e.g. ceramic, glass} - H05K 3/10: in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern - H10W 76/60: Seals - H10W 70/655: Fan-out layouts - H10W 76/18: Insulating materials, e.g. resins, glasses or ceramics - H10W 90/724: {between a chip and a stacked insulating package substrate, interposer or RDL} - Y10T 29/49155: Manufacturing circuit on or in base - Y10T 29/49165: by forming conductive walled aperture in base - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A ceramic substrate includes a substrate body formed of ceramic and having a pair of surfaces each assuming a rectangular shape as viewed in plane, and a metallization layer formed on the surface of the substrate body and adapted to braze a metal frame thereon. A composite material layer is disposed between the surface of the substrate body and the metallization layer and is formed such that a ceramic portion, a metal portion 10m formed of a metal similar to a metal component of the metallization layer or a metal which, together with a metal component of the metallization layer, forms an all proportional solid solution, and a glass portion exist together. The thickness of the composite material layer is thinner than that of the metallization layer. A plating layer is deposited on the surface of the metallization layer. ## Claims ### Claim 1 A ceramic substrate comprising a substrate body formed of ceramic and having a pair of surfaces each assuming a rectangular shape as viewed in plane, and a metallization layer formed on at least one of the surfaces of the substrate body and adapted to mount a metal member thereon, and characterized in that a composite material layer is formed between the surface of the substrate body and the metallization layer and is formed such that a ceramic portion, a metal portion formed of a metal similar to a metal component of the metallization layer or a metal which, together with a metal component of the metallization layer, forms an all proportional solid solution, and a glass portion exist together, a thickness of the composite material layer is thinner than a thickness of the metallization layer, and a plating layer is deposited on a surface of the metallization layer. ### Claim 2 (depends on 1) A ceramic substrate according to claim 1, wherein the composite material layer is formed on the entirety of the surface of the substrate body. ### Claim 3 (depends on 1) A ceramic substrate according to claim 1, wherein a cavity having a rectangular shape as viewed in plane opens at a central portion of the surface of the substrate body, and the metallization layer and the composite material layer are formed on the surface of the substrate body at a portion excluding the cavity. ### Claim 4 (depends on 1) A ceramic substrate according to claim 1, wherein a metal frame having a rectangular shape as viewed in plane is joined onto the plating layer via a brazing material. ### Claim 5 (depends on 2) A ceramic substrate according to claim 2, wherein the composite material layer contains the metal portion in an amount of 3 vol % to 20 vol % and the ceramic portion and the glass portion as balance. ### Claim 6 (depends on 3) A ceramic substrate according to claim 3, wherein the composite material layer contains the metal portion in an amount greater than 20 vol % to 80 vol % and the ceramic portion and the glass portion as balance. ### Claim 7 (depends on 1) A ceramic substrate according to claim 1, wherein the composite material layer is a laminate of one or more partial composite material layers which differ in mixing ratio of the ceramic portion, the metal portion, and the glass portion. ### Claim 8 (depends on 1) A ceramic substrate according to claim 1, wherein the composite material layer is formed on the surface of the substrate body at at least four corner portions of the surface. ### Claim 9 (depends on 1) A method of manufacturing a ceramic substrate according to claim 1, characterized by comprising: a step of forming a composite material layer composed of a ceramic portion, a metal portion, and a glass portion on the entirety of at least one surface of a pair of surfaces, each having a rectangular shape as viewed in plane, of a ceramic green sheet, a step of forming a metallization layer on an upper surface of the composite material layer, and a step of depositing a plating layer on a surface of the metallization layer. ### Claim 10 (depends on 3) A method of manufacturing a ceramic substrate according to claim 3, characterized by comprising: a step of forming a composite material layer composed of a ceramic portion, a metal portion, and a glass portion on the entirety of one surface of a pair of surfaces, each having a rectangular shape as viewed in plane, of an upper ceramic green sheet, a step of forming a metallization layer on an upper surface of the composite material layer, a step of punching out, along a thickness direction, a central portion of the upper ceramic green sheet on which the composite material layer and the metallization layer) are formed, thereby forming a through-hole having a rectangular shape as viewed in plane, and a step of laminating a flat lower ceramic green sheet to cover the through-hole on a back surface of the upper ceramic green sheet, and a step of depositing a plating layer on the surface of the metallization layer, the surface having a rectangular shape as viewed in plane as a result of performing the step of forming the through-hole. ### Claim 11 (depends on 9) A method of manufacturing a ceramic substrate according to claim 9, characterized in that as viewed in plane, the ceramic green sheet is composed of a product region where a plurality of substrate regions which are to become ceramic substrates are juxtaposed adjacently in rows and columns, and a edge portion having the form of a rectangular frame and located around the product region, and the metallization layer is formed along four sides of the composite material layer in each of the substrate regions. ### Claim 12 (depends on 10) A method of manufacturing a ceramic substrate according to claim 10, characterized in that as viewed in plane, each of the upper and lower ceramic green sheets is composed of a product region where a plurality of substrate regions which are to become ceramic substrates are juxtaposed adjacently in rows and columns, and a edge portion having the form of a rectangular frame and located around the product region, and the step of forming the through-hole is performed on the upper ceramic green sheet on which the composite material layer and the metallization layer are formed, at a central portion of each of the substrate regions. ### Claim 13 (depends on 9) A method of manufacturing a ceramic substrate according to claim 9, characterized by having a step of joining a metal frame having the form of a rectangular frame as viewed in plane onto the plating layer via a brazing material after completion of the steps.