# US 4,397,800 A · Ceramic body having a metallized layer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,397,800 A - Document ID: US4397800A - Status: Granted - Kind: A - Application number: 06/242,665 - Filed: 1981-03-11 - Granted: 1983-08-09 - Earliest claimed: 1978-06-17 - Assignees: NGK Insulators, Ltd. - Inventors: Go Suzuki; Kazuo Michishita - Web page: https://patentgrep.com/patent/US4397800A ## CPC - C04B 41/88: Metals - B22F 7/06: of composite workpieces or articles from parts, e.g. to form tipped tools {(B22F7/002 takes precedence)} - C04B 41/009: {characterised by the material treated} - C04B 41/51: Metallising {, e.g. infiltration of sintered ceramic preforms with molten metal (covering materials with metals in general C23C; ceramic compositions containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides, other than as macroscopic reinforcing agents C22C; infiltration of preforms containing free metal, e.g. cermets C22C)} - C23C 24/085: {Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides} - H01G 4/0085: {Fried electrodes} - H05K 1/092: {Dispersed materials, e.g. conductive pastes or inks} - H10D 86/85: characterised by only passive components - H10W 70/611: {for connecting multiple chips together} - H10W 70/685: comprising multiple insulating layers - H10W 70/692: Ceramics or glasses - H10W 90/00: Package configurations - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A ceramic body having a metallized layer which comprises a ceramic substrate and a metallized layer fired on the substrate to be integrated or further comprises a conductive layer consisting of a noble metal or noble metal alloy to be joined onto the metallized layer, the composition of the metallized layer being one or more of a silicide of transition metals belonging to Groups V and VI of periodic table; one or more of a boride of lanthanum and a boride of transition metals belonging to Groups IV, V and VI of periodic table; or a high melting point metal or alloy unmelted at a firing temperature of the ceramic substrate and containing, based on 100 parts by weight of the metal or alloy, 0.5-25 parts by weight of niobium, 0.5-10 parts by weight of yttrium, 0.5-10 parts by weight of tantalum, 0.5-25 parts by weight of mixture of niobium and yttrium, 0.5-25 parts by weight of mixture of yttrium and tantalum, 0.5-25 parts by weight of mixture of niobium and tantalum, 0.5-25 parts by weight of mixture of niobium, yttrium and tantalum, 0.05-3 parts by weight of nickel, 0.5-4 parts by weight of chromium or 0.05-3 parts by weight of mixture of nickel and chromium, which is a useful material for various electronic and electric apparatuses. ## Claims ### Claim 1 A process for producing a ceramic body having a metallized layer which comprises tape-casting a ceramic slurry to form a ceramic green sheet, screen printing and drying a plurality of metallizing paste layers comprising one or more of a high melting point metal or alloy unmelted at a firing temperature of the ceramic substrate and containing, based on 100 parts by weight of metal or alloy, 0.5 to 25 parts by weight of niobium, 0.5 to 10 parts by weight of yttrium, 0.5 to 10 parts by weight of tantalum, 0.5 to 25 parts by weight of a mixture of niobium and yttrium, 0.5 to 25 parts by weight of a mixture of yttrium and tantalum, 0.5 to 25 parts by weight of a mixture of niobium and tantalum, 0.5 to 25 parts by weight of a mixture of niobium, yttrium and tantalum, 0.05 to 3 parts by weight of nickel, 0.5 to 4 parts by weight of chromium or 0.05 to 3 parts by weight of a mixture of nickel and chromium; screen printing and drying insulating paste to separate, at least in part, said metallized layers from one another; and firing the composite so formed at a temperature of 1450.degree. C. to 1600.degree. C. in a reducing atmosphere; and thereafter screen printing and drying a noble metal or noble metal alloy paste on the metallized layer and firing the resulting composite at a temperature of 500.degree. C. to 900.degree. C. in an oxidative atmosphere. ### Claim 2 (depends on 1) The process according to claim 1 wherein multiple layers of metallized paste are screen printed on the ceramic green sheet each of said layers being separated from one another by an insulating paste. ### Claim 3 (depends on 1, 3) The process according to claims 1 or 3 which comprises further screen printing and drying a noble metal or noble metal alloy paste on the metallized layer and firing the resulting composite at a temperature of 500.degree. to 900.degree. C. in an oxidative atmosphere. ### Claim 4 A process for producing a ceramic body having a metallized layer which comprises tape-casting a ceramic slurry to form a ceramic green sheet, screen printing and drying at least one metallizing paste comprising one or more of a silicide of transition metals selected from the elements consisting of Groups V and VI of the periodic table; one or more of a boride of lanthanum and a boride of a transition metal selected from Groups IV, V and VI of the periodic table; or a high melting point metal or alloy unmelted at a firing temperature of the ceramic substrate and containing, based on 100 parts by weight of metal or alloy, 0.5 to 25 parts by weight of niobium, 0.5 to 10 parts by weight of yttrium, 0.5 to 10 parts by weight of tantalum, 0.5 to 25 parts by weight of a mixture of niobium and yttrium 0.5 to 25 parts by weight of a mixture of yttrium and tantalum, 0.5-25 parts by weight of a mixture of niobium and tantalum, 0.5-25 parts by weight of a mixture of niobium, yttrium and tantalum, 0.05 to 3 parts by weight of nickel, 0.5 to 4 parts by weight of chromium or 0.05 to 3 parts by weight of a mixture of nickel and chromium and firing the composite so formed at a temperature of 1450.degree. C. to 1600.degree. C. in a reducing atmosphere.